Implementation Guide

HL7 Specifications for Laboratory Observation Reporting (ORU Messages)

October 12, 2011

Version 1.3

Logo Hawaiian Health Information Corporation, Hawaiian Source of healthcare data

HHIC LABORATORY INFORMATION AHRQ PROJECT

INTRODUCTION

This document serves as a functional specification and technical requirements for integrating key lab results with Hawaii Health Information Corporation's (HHIC) inpatient database via Health Level 7 (HL7).We request a library of 32 laboratory tests and their respective LOINC codes be transmitted from each of our prospective ELR (Electronic Laboratory Reporting) providers.

HHIC uses these results of the key lab tests to enhancethe content of their existing statewide, all-payer hospital discharge database by adding key hospitalization-related laboratory results. The enhanced data set will be used to improve the predicative methodology use to measure key patient outcomes, such as inpatient mortality.1

1 This effort is supported by CER funding received from The Agency for Healthcare Research and Quality (AHRQ). Todd Seto, MD, from The Queen's Medical Center is the Primary Investigator and will direct the comparative effectiveness research component of the research. Jill Miyamura, PhD, HHIC, is Co-Principal Investigator. HHIC's role is to demonstrate the feasibility of enhancing inpatient all-payer data with clinical (laboratory) data to support the purpose of comparative effectiveness research. More information on the grant, its aims and methodology can be found at http://www.hcup-us.ahrq.gov/datainnovations.jsp.

Contents

HHIC Laboratory Information AHRQ Project

Introduction

General Specifications

Lab Data Set

Table1. Summary of Laboratory Tests and LOINC

Appendix A: The Health Level Seven (HL7) Standard

Appendix B: Message Segments: Field Specifications and Usage

Appendix C: MSH Segment

Appendix D: PID Segment

Appendix E: PV1 Segment

Appendix F: Common Order (ORC) Segment

Appendix G: OBR Segment

Appendix H: OBX Segment

Appendix I: NTE Segment

Appendix J: References

Appendix K: Selected HL7 Data Types and Segment Sequencing

Appendix L: Optionality of Segments: Designation and Meaning

Appendix M: Sample ORU Messages

Appendix N: HHIC Use Only - Edits Applied After Receipt

GENERAL SPECIFICATIONS

The instructions and specification contained in the Implementation Guide- HL7 Specifications for Laboratory Observation Reporting (ORU Messages) are applicable to participating HHIC institutions submitting data to HHIC, effective with discharges of January, 2008.

Hospitalization-related (Inpatient) laboratory results should be obtained from laboratory hospital's clinical laboratory system/laboratory information system. Observed test results (e.g., finger stick) and other test results from glucometers, chemsticks, etc. should not be submitted. Submit test results specific to that laboratory test only. As an example, for the test of hemoglobin, do not submit a hemoglobin value that was reported as part of an arterial blood gas test result.

Units of Measure

Each laboratory test has a unique test code that represents both the laboratory test and the unit of measure. For example, the laboratory test lists Glucose with mg/dL as the unit of measurement. The laboratory test codes were designed to accept the submission of the units of measure used specified in the LOINC system. Please consult with the clinical laboratory system/laboratory information system personnel at your facility if you have questions regarding the laboratory units of measures outlined on page 10, Table 1.

Corrected Values

When two results are available for the same date and time the laboratory specimen was collected and one is labeled "corrected", submit the final corrected test result.

Data Submission Schedule

Lab will be submitted to HHIC as follows:

Data Due at HHIC File
July 1, 2011 50 test messages per hospital
September 1, 2011 1st Quarter 2008
October - December, 2011 2nd, 3rd, 4th Quarter 2008 data (HHIC will provide a detailed schedule by October, 2011)
2012 schedule To be established by November, 2011

Data File Description

The file will be submitted in batch on a quarterly basis (at the beginning—and will move to a more frequent schedule as defined at a later time). Each submission should include a summary document with the following information: hospital name/ID, time frame of messages submitted, number of messages sent in the batch.

Separate batch files should be submitted for each hospital.

Transmission Options

Data will be transmitted to HHIC in one of the following ways:

  1. Secure File Transfer Protocol (SFTP)
  2. VPN

HHIC will collaborate with each provider to determine the best method.

LAB DATA SET

The lab data set includes the specified laboratory data of all inpatient admissions for the specified time period. Generally, data elements specified in the Implementation Manual follow HL7 standards.

The ORU message segments that HHIC requires follows: MSH, PID, PV1, OBR, OBX, NTE.The required message segments, associated fields, and key demographic data are listed on the following pages.

List of All Data Elements

The demographic fields to be sent in specific segments are listed in the table below. The specific ORU required segments (and fields) follow.

NAME Message location HL7 DT Length
*Account number PID-18 CX 250
*Admission Date PV1-44 TS 26
*Discharge Date PV1-45 TS 26
*Date of Birth PID-7 TS 26
*Facility Name MSH-4 HD 227
Gender PID-8 IS 1
Hospital ID TBD HD 6
Hospital Test (order) OBR-4 CE 250
Hospital Test (result - LOINC) OBX-3 CE 250
Medical Record Number PID-3 CX 250
Ordering Physician (Last, First, MI) OBR-16 XCN 250
*Patient Name (Last, First, MI) PID-5 XPN 250
Physician NPI OBR-16 XCN 250
*Social Security Number PID-19 ST 19
*for linking lab file to HHIC patient files

MSH Segment

Seq NAME HHIC USE Type R/O LEN
1 Field Separator "|" ST R 1
2 Encoding characters ^ ~ \ & ST R 4
3 Sending Application LIS e.g. "SENDER_GenericLABSYSTEM-LIS" HD R 227
4 Sending Facility The sender of the message information, hospital name.
hospital name^ CLIA code^CLIA
YourHospital-Honolulu^45D3456781^CLIA
HD R 227
5 Receiving Application CLH, DLS or Hospital name HD R 227
6 Receiving Facility The brief provider organization name assigned when the provider first registers with the lab HD R 227
7 Date/Time Of Message 20110602161633
YYYYMMDDHHMM[SS]
TS R 26
9 Message Type ORU^R01 MSG R 7
10 Message Control Id The sending system must assign an identifier for the message that is unique within the namespace of the sending facility ST R 50
11 Processing ID P PT R 3
12 Version ID 2.3 VID R 60

PID Segment

Seq NAME HHIC USE Type R/O LEN
3 Patient ID Medical Record Number ST R 250
5 Patient Name Last^First^Middle XPN R 250
7 Date/Time Of Birth YYYYMMDD TS RE 26
8 Sex F, M, or U IS R 1
18 Patient Account Number Patient Account Number ST R 250
19 SSN - Patient Sent if available ST RE 16

PV1 Segment

Seq NAME HHIC USE Type R/O LEN
2 Patient Class E (Emergency Department visits), I (Inpatient Admission), O (Outpatient) IS R 1
44 Admission Date/Time Date and time of the patient presentation. TS RE 26
45 Discharge Date/Time Date and time of the patient discharge. TS RE 26

Common Order (ORC) Segment

Used to transmit fields that are common to all orders. The ORC is NOT a required segment for HHIC.

OBR Segment

Seq NAME HHIC USE Type R/O LEN
3 Filler Order Number LIS order number = internal access number EI R 50
4 Universal Service Identifier Ordered test code
^^^[lab order code]^[description]
CE R 250
7 Observation Date/Time YYYYMMDDHHMMSS TS R 26
16 Ordering Provider 1434567516^LASTNAME^PHYSICIANFIRST
[PhysicianIDNPI]^[PhysicianLast]^[PhysicianFirst]
XCN R 250
22 Results Rpt/Status Chng - Date/Time "activity end date/time" TS R 26
25 Result status Only "F" ID R 1

OBX Segment (See next page for "Summary of Required Lab Tests and LOINC")

Seq NAME HHIC USE Type R/O LEN
3 Observation Identifier Local RESULT code^LOINC
4544-3^Hematocrit^LN^HCT^Hematocrit^LAB
Result code^test description

LOINC Code^LOINC description^LN^local code^local description^L
CE R 250
4 Observation sub-ID 0 ST R 20
5 Observation value Result
Example 1 - Hepatitis A IgM test was positive
OBX|1|CE|5182-1^Hepatitis A Virus IgM Serum Antibody EIA^LN||G-A200^Positive^SNM|

Example 2 - antimicrobial susceptibility testing
OBX|1|SN|7059-9^Vancomycin Susceptibility, Gradient Strip^LN||<^1
* C 9999
6 Units Unit of measure CE RE 250
7 Reference ranges Upper and lower limit ST RE 60
8 Abnormal flags Result value - S, I, or R, and should be provided in addition to the numeric value in OBX-5
When findings other than susceptibility results are sent, the abnormal flag should be valued (e.g., "H", "N", or "A")
IS RE 5
11 Observation Result Status F = completed. Correct and final results ID R 1

NTE Segment

Seq NAME HHIC USE Type R/O LEN
1 Set ID NTE SI O 4
2 Source of Comment Used when source of comment must be identified ID X 8
3 Comment Comment FT RE 65536
4 Comment Type   CE O 250

Table1. Summary of REQUIRED Laboratory Tests and LOINC

  Lab Test Lab Test Name LOINC Units LOINC SHORTNAME
Chemistry Albumin Albumin 1751-7 g/dL Albumin SerPI-MCnc
Alkaline phosphatase Alkaline phosphatase 6768-6 U/L;units/L ALP SerPl-cCnc
Blood urea nitrogen (BUN) Urea nitrogen 3094-0 mg/dL BUN SerPl-mCnc
Bilirubin (total) Bilirubin 1975-2 mg/dL Bilirub SerPl-mCnc
Calcium Calcium 17861-6 mg/dL Calcium SerPl-mCnc
Chloride Chloride 2075-0 mmol/L Chloride SerPl-sCnc
Creatine kinase-MB Creatine kinase-MB 13969-1 ng/mL; ug/L CK MB SerPl-mCnc
Creatinine Creatinine 2160-1 mg/dL Creat SerPl-mCnc
Glucose Glucose 2345-7 mg/dL Glucose SerPl-mCnc
Gamma glutamyl transferase Gamma glutamyl transferase 2324-2 U/L;units/L GGT SerPl-cCnc
Potassium Potassium 2823-3 mmol/L Potassium SerPl-sCnc
Phosphate Phosphate 2777-1 mg/dL Phosphate SerPl-mCnc
BNP Natriuretic peptide.B 30934-4 pg/mL BNP SerPl-mCnc
Sodium Sodium 2951-2 mmol/L Sodium SerPl-sCnc
Troponin I Troponin I.cardiac 10839-9 ug/L;ng/mL Troponin I SerPl-mCnc
SGOT Aspartate aminotransferase 1920-8 U/L;units/L AST SerPl-cCnc
SGPT Alanine aminotransferase 1742-6 U/L;units/L ALT SerPl-cCnc
Blood Gas pO2 Oxygen 2703-7 mm Hg pO2 BldA
pCO2 Carbon dioxide 2019-8 mm Hg pCO2 BldA
pH(arterial) pH 2744-1   pH BldA
Base excess Base excess 1925-7 mmol/L Base excess BldA-sCnc
Bicarbonate Bicarbonate 1960-4 mmol/L HCO3 BldA-sCnc
Hematology Hemoglobin Hemoglobin 718-7 g/dL Hgb Bld-mCnc
Hematocrit Hematocrit 4544-3 L/L;% Hct Fr Bld Auto
Partial thromboplastin time (PTT) Coagulation surface induced 14979-9 Sec aPTT Time PPP
Prothrombin time (PT) Coagulation tissue factor induced 5902-2 Sec PT Time PPP
INR Coagulation tissue factor induced.INR 34714-6 INR(POC) INR PPP
Platelet count Platelets 777-3 10^9/L Platelet # Bld Auto
White blood count (WBC) Leukocytes 6690-2 10*3/uL WBC # Bld Auto
Microbiology Blood culture   600-7    
Urine culture   630-4    
Sputum culture   6460-0    

APPENDIX A: THE HEALTH LEVEL SEVEN (HL7) STANDARD

The ANSI HL7 standard is widely used for data exchange in the healthcare industry, and is quite lengthy, covering a variety of situations in patient care and healthcare finance. This document covers the subset of HL7 that will be used for LIS (laboratory information system) records received by HHIC from outside systems.

The basic unit transmitted in an HL7 implementation is the message. Messages are made up of several segments, each of which is one line of text, beginning with a three-letter code identifying the segment type. Segments are in turn made up of several fields separated by a delimiter character, "|". Below is an example LAB accession in HL7 2.3 format.

In this example, a message consisting of seven segments (MSH, PID, PV1, ORC, OBR, and OBX [0 thru 1]) is being sent to HHIC from a LAB database.


MSH|^~\&|YourHL7System|YourHIFACILITY |X| HHIC Database
|20110329082006||ORU^R01|201103290820062979|T|2.3
PID||55555^182P478_367903|15161516;1^^^1|55555^LAB^1|TEST^EMR^SAMPLE||1965101
5|F|||||||||IB873749|45879|123456789|H
PV1||O|XOP^^^LAB|||16626|16626^TEST^PHYSICIAN|||||||||||OP|182P478_367903560475_10
1_1|||||||||||||||||||||||||20110329000000
ORC|RE||E2908978T8191219L1143|||||||||16626^TEST^PHYSICIAN^LABT02|LAB
OBR|1|20110329082006|201103290820062979|ABC^Automated Bld
Cnt|||20110329045100|||||||20110329081100||16626^TEST^PHYSICIAN^LABT02||||T8191|2
19L1143^0|||H|F||^^^^^R
OBX|0|NM|6690-2^Leukocytes^LN^WBC^WBC^LAB|0|11.8|10(9)/L|3.8-
11.2|H|||F|||20110329081700|12D0664165^LAB-HMCW\91-2135 Fort Weaver Road, #
300\Ewa Beach\HI\96706-1929\Glen Doctor, MD
OBX|1|NM|^^LN^RBC^RBC^LAB|0|3.01|10(12)/L|3.9-
5.2|L|||F|||20110329081700|12D0664165^LAB-HMCW\91-2135 Fort Weaver Road, #
300\Ewa Beach\HI\96706-1929\Glen Doctor, MD

In the above example, the Message Header segment (MSH) carries the owner of the information being sent (YourHIFACILITY) and receiver (HHIC Database) and identifies the message as being of type ORU, Unsolicited Observation Result.

The Patient Identification segment (PID) carries the client's name (EMR TEST), birth date (19651015, in YYYYMMDD format), and other identifying fields.

PV1 carries the Patient Visit information, ORC carries Common Order information from the referring physician, OBR carries the observation request (e.g. perform biopsy), and several OBX segments carry the LAB laboratory observations, including clinical indications, gross description, and the diagnosis provided by the LAB physician or pathologist.

LAB/ will provide HL7 messages to communicate with HHIC. These files will be transmitted to the interface engine hosted at HHIC. Each HL7 file will contain one HL7 message that includes data for oneLAB accession.

HL7 does not require the use of a particular coding system to identify either the observation or the result. In the past, users tended to use their own unique code systems for identifying tests and other clinical observations because standard codes were not available. Such local code systems suffice for transmitting information within single institutions, but present high barriers to aggregating data from many sources for research or for public health record systems. Standard code systems such as LOINC® now exist for many of these purposes, and we strongly encourage their use in reporting. Standard codes (LOINC) can be sent as the only code in the OBX-3 field, or they can be sent along with the local code (your local lab code) as the second code system represented in that field (See OBX segment).

APPENDIX B: MESSAGE SEGMENTS: FIELD SPECIFICATIONS AND USAGE

HL7 Segment Structure

Each segment consists of several fields, separated by the field separator character, "|". The table below defines how each segment (described on pages 7-17) is structured.

Field/Column Description
SEQ The ordinal position of the field in the segment. Since HHIC does not use all possible fields in the HL7 standard, these are not always consecutive.
NAME HL7 element name for the field.
HHIC Use Short explanation of the use of this field.
TYPE HL7 data type of the field. See Appendix K for definition of HL7 data types.
R/0 Refers to if a field is required or optional. R means required for HL7 message for LAB. RE means indicated, required, but message will not be rejected if not present. C means conditional (Conditional on the trigger event or on some other field(s)). (See Appendix L)
LEN Maximum length of the field

HL7 data types: Each field in the HL7 message has an HL7 data type. Appendix K of this document lists and defines the HL7 data types needed by HHIC. The elemental data types Numeric (NM) and String (ST) consist of one value, while some data types, such as Patient Name are composites.

Delimiter characters: Field values of composite data types consist of several components separated by the component separator, "^". When components are further divided into sub-components, these are separated by the sub-component separator, "&". Some fields are defined to permit repetitions separated by the repetition character, "~". When these special characters need to be included within text data, their special interpretations are prevented by preceding them with the escape character, "\".

APPENDIX C: MSH SEGMENT

The MSH segment defines the intent, source, destination, and some specifics of the syntax of a message.

SEQ NAME HHIC Use Type R/O LEN
1 Field Separator "|" ST R 1
2 Encoding Characters ^ ~ \ & ST R 4
3 Sending Application LIS e.g. "SENDER_GenericLABSYSTEM-LIS" HD R 227
4 Sending Facility The sender of the message information, hospital name.
hospital name^ CLIA code^CLIA
YourHospital-Honolulu^45D3456781^CLIA
HD R 227
5 Receiving Application CLH, DLS or Hospital name HD R 227
6 Receiving Facility The brief provider organization name assigned when the provider first registers with the lab HD R 227
7 Date/Time Of Message 20110602161633
YYYYMMDDHHMM[SS]
TS R 26
9 Message Type ORU^R01 MSG R 7
10 Message Control Id The sending system must assign an identifier for the message that is unique within the namespace of the sending facility ST R 50
11 Processing ID P PT R 3
12 Version ID 2.3 VID R 60

Notes:

MSH-1 Determines the field separator in effect for this message. Requires the HL7 recommended field separator of "|".

MSH-2 Determines the component separator, repetition separator, escape character, and sub-component separator in effect for the rest of this message. HHIC requires the HL7 recommended values of ^~\&.

Definition: Four characters in the following order:
Component separator '^' ASCII (94)
Repetition Separator '~' ASCII (126)
Escape character '\' ASCII (92)
Subcomponent separator '&smp;' ASCII (38)

MSH-3 Name of the sending application. When sending, LAB will use their LAB Information System identifier.

MSH-4 Identifies the sender (the owner of the message information). When sending, LAB will use "Hospital Name."

MSH-5 Name of the RECEIVING application. Regional or hospital lab that is processing the order.

MSH-6 Identifies the message receiver. This field identifies the organization responsible for the operations of the receiving application.

MSH-7 Date and time the message was created. This includes the time zone. See the TS data type.YYYY[MM[DD[HHMM[SS[.S[S[S[S]]]]]]]][+/-ZZZZ] is the HL7 format for the Time Stamp. Z is the time zone offset. Send values only as far as needed. When a system has only a partial date, e.g., month and year, but not day, the missing values may be interpreted as zeros. The time zone is assumed to be that of the sender.

Example: 20110526132010-0800 - May 26th, 2011, 13:20:10, Pacific Time.

MSH-9 Two components give the HL7 message type/HL7 triggering event. For outbound results (to HHIC) this field should be "ORU^R01", where ORU is the message ID for Observation Result / Unsolicited and R01 is an Unsolicited Transmission.

MSH-10 The message control ID is a string (which may be a number) uniquely identifying the message among all those ever sent by the sending system. LAB will use "xxauniquevalue." CCYYMMDDnnnnnnn may be used, (or DDD - Julian date instead of MMDD) and nnnnnnn is the sequence number for that day. Calendar Date: CCYYMMDD with CC = century, YY = last 2 digits of year, and valid ranges of month = 01 through 12 and day = 01 through 31.

MSH-11 The processing ID to be used by LAB is P for production. T = Training / testing.

MSH-12 -- "2.3" to indicate HL7 Version 2.3.

NOTE: We have used 2.3 as the default version. 2.3 or higher may be sent, up to 2.5.1.

APPENDIX D: PID SEGMENT

The PID segment is used by all applications as the primary means of communicating patient identification information. This segment contains permanent patient identifying and demographic information that, for the most part, is not likely to change frequently.

SEQ NAME HHIC Use Type R/O LEN
3 Patient ID Medical Record Number CX R 250
5 Patient Name Last^First^Middle XPN R 250
7 Date/Time Of Birth YYYYMMDD TS RE 26
8 Sex F, M, or U IS R 1
18 Patient Account Number Patient Account Number CX R 250
19 SSN - Patient Sent if available ST RE 16

Notes:

PID-3 The unique medical record number of the patient's chart within the system. Patient's unique identifier(s) from the facility.

PID-5 Example:
Doe^Mary^A [PatientLastName]^[PatientFirstName]
^[PatientMiddleName]. Last name and first name are required.

PID-7 Give the year, month, and day of birth (YYYYMMDD). LAB may ignore any time component in the birth date. Time stamp (TS) data type must be in the format: YYYY[MM[DD[HHMM[SS[.S[S[S[S]]]]]]]][ ]. The user values the field only as far as needed. When a system has only a partial date, e.g., month and year, but not day, the missing values may be interpreted as zeros. The time zone is assumed to be that of the sender.

PID-8 Use F, M, or U (F = Female, M = Male, U = Unknown)

PID-18 This field is required and must contain an account number. Definition: This field contains the patient account number assigned by accounting to which all charges, payments, etc., are recorded. The entire number including the check digit will be considered the patient account number.

PID-19 Sent only if stored in lab system.

APPENDIX E: PV1 SEGMENT

The PV1 (Patient Visit Segment Definition) segment is used by Registration/Patient Administration applications to communicate information on a visit-specific basis.

SEQ NAME HHIC Use Type R/O LEN
2 Patient Class E (Emergency Department visits), I (Inpatient Admission), O (Outpatient) IS R 1
44 Admission Date/Time Date and time of the patient presentation. TS RE 26
45 Discharge Date/Time Date and time of the patient discharge. TS RE 26

Notes:

PV1-2 Patient Class does not have a consistent industry-wide definition and is subject to site-specific variations. Patient Class = E (Emergency Department visits) or I (Inpatient Admission), or O (Outpatient). Literal values: "E", "I" or "O".

PV1-44 YYYYMMDDHHMM[SS[.S[S[S[S]]]]] [+/-ZZZZ]. Date and time patient arrived for services.

PV1-45 YYYYMMDDHHMM[SS[.S[S[S[S]]]]] [+/-ZZZZ] - Date and time patient was discharged from facility, as known/recorded/available.

APPENDIX F: COMMON ORDER (ORC) SEGMENT

Used to transmit fields that are common to all orders. The ORC is NOT a required segment by HHIC.

APPENDIX G: OBR SEGMENT

The Observation Request Segment carries general information about the sample, test, or result. For laboratory-based reporting, the OBR defines the attributes of the original request for laboratory testing. Essentially, the OBR describes a battery or panel of tests that is being requested or reported. The OBR is similar to a generic lab slip that is filled out when a physician requests a lab test. The individual test names and results for the panel of tests performed are reported in OBX segments, which are described below. As defined by the ORU syntax, there can be many OBXs per OBR, and there can be many OBRs per PID.

Example:

OBR|1|20110329082006|201103290820062979|ABC^Automated Bld Cnt|||20110329045100|||||||20110329081100||16626^TEST^PHYSICIAN^LABT02||||T8191|219L1143^0|||H|F||^^^^^R

SEQ NAME HHIC Use Type R/O LEN
3 Filler Order Number LIS order number = internal access number EI R 50
4 Universal Service Identifier Ordered test code
^^^[lab order code]^[description]
CE R 250
7 Observation Date/Time YYYYMMDDHHMMSS TS R 26
16 Ordering Provider 1434567516^LASTNAME^PHYSICIANFIRST
[PhysicianID-NPI]^[PhysicianLastName]^[PhysicianFirstName]
XCN R 250
22 Results Rpt/Status Chng - Date/Time "activity end date/time" TS R 26
2 Result status Only "F" ID R 1

Notes:

OBR-3 This is the LAB (LIS) internal order number.

Example: PL2010-123456 - [LABAccessionNumber].

Definition:

It is assigned by the order filler (receiving) application. This string must uniquely identify the order (as specified in the order detail segment) from other orders in a particular filling application (e.g., clinical laboratory). This uniqueness must persist over time.

OBR-4 This is an element containing the LAB case sample procedure type ID and description.

Components: <identifier (ST)> ^ <text (ST)> ^ <name of coding system (ST)> ^<alternateidentifier (ST)> ^ <alternate text (ST)> ^ <name of alternate coding system (ST)>

The LOINC is more desirable in the OBX segment, field 3. Panels will have one OBR followed by multiple OBX segments (one for each test in the panel).

OBR-7 This is the LAB collected date, including time and time zone. This field is the clinically relevant date/time of the observation. In the case of observations taken directly from a subject, it is the actual date and time the observation was obtained.

OBR-16 This is a complex element containing three components related to the ordering physician. When the provider is assigned a National Provider ID (NPI) the NPI is transmitted as the ID: 1) NPI or Hospital Physician ID (NPI strongly preferred), 2) last name of referring physician, and 3) first name of referring physician.

Example: 5551001234^Smith^Bob

OBR-22 This field is used to indicate the date and time that the results are composed into a report and released to the individual OBX), or that a status, is entered or changed.

OBR-25 This is the test status and will be "F" for finalized.

HL7 Table - Result status (For reference)

Value Description
O Order received; specimen not yet received
I No results available; specimen received, procedure incomplete
S No results available; procedure scheduled, but not done
A Some, but not all, results available
P Preliminary: A verified early result is available, final results not yet obtained
C Correction to results
R Results stored; not yet verified
F Final results; results stored and verified. Can only be changed with a corrected result.
X No results available; Order canceled.
Y No order on record for this test. (Used only on queries)
Z No record of this patient. (Used only on queries)

APPENDIX H: OBX SEGMENT

The Observation/Result segment is used to transmit the observations of the LAB. OBX segments have great flexibility to report information. When properly coded, OBX segments report a large amount of information in a small amount of space. OBX segments within the ORU message are widely used to report laboratory and other clinical information.

There can be many OBX segments identified like OBX|1|, OBX|2|, OBX|3|, OBX|4|, OBX|5|, and OBX|6|, etc.

Example:

OBX|0|NM|6690-2^Leukocytes^LN^WBC^WBC^LAB|0|11.8|10(9)/L|3.8-
11.2|H|||F|||20110329081700|12D0664165^LAB-HMCW\91-2135 Fort Weaver Road, # 300\Ewa
Beach\HI\96706-1929\Glen Doctor, MD
OBX|1|NM|^^LN^RBC^RBC^LAB|0|3.01|10(12)/L|3.9-5.2|L|||F|||20110329081700|12D0664165^LAB-
HMCW\91-2135 Fort Weaver Road, # 300\Ewa Beach\HI\96706-1929\Glen Doctor, MD
OBX|2|NM|718-7^Hemoglobin^LN^HGB^Hemoglobin^LAB|0|9.2|g/dL|11.6-
15.1|L|||F|||20110329081700|12D0664165^LAB-HMCW\91-2135 Fort Weaver Road, # 300\Ewa
Beach\HI\96706-1929\Glen Doctor, MD
OBX|3|NM|4544-3^Hematocrit^LN^HCT^Hematocrit^LAB|0|27.2|%|34.1-
44.2|L|||F|||20110329081700|12D0664165^LAB-HMCW\91-2135 Fort Weaver Road, # 300\Ewa
Beach\HI\96706-1929\Glen Doctor, MD
OBX|4|NM|^^LN^MCV^MCV^LAB|0|90.3|fL|80-100||||F|||20110329081700|12D0664165^LAB-
HMCW\91-2135 Fort Weaver Road, # 300\Ewa Beach\HI\96706-1929\Glen Doctor, MD
OBX|5|NM|^^LN^MCH^MCH^LAB|0|30.4|pg|27-33||||F|||20110329081700|12D0664165^LAB-
HMCW\91-2135 Fort Weaver Road, # 300\Ewa Beach\HI\96706-1929\Glen Doctor, MD
OBX|6|NM|^^LN^MCHC^MCHC^LAB|0|33.7|g/dL|32-36||||F|||20110329081700|12D0664165^LAB-
HMCW\91-2135 Fort Weaver Road, # 300\Ewa Beach\HI\96706-1929\Glen Doctor, MD
OBX|7|NM|^^LN^RDW^RDW^LAB|0|14.4|%|11-15||||F|||20110329081700|12D0664165^LAB-HMCW\91-
2135 Fort Weaver Road, # 300\Ewa Beach\HI\96706-1929\Glen Doctor, MD
OBX|8|NM|777-3^Platelets^LN^PLTC^Platelet Count^LAB|0|119|10(9)/L|150-
450|L|||F|||20110329081700|12D0664165^LAB-HMCW\91-2135 Fort Weaver Road, # 300\Ewa
Beach\HI\96706-1929\Glen Doctor, MD
SEQ NAME OBX - HHIC Use TYPE R/O LEN
3 Observation Identifier Local RESULT code^LOINC
4544-3^Hematocrit^LN^HCT^Hematocrit^LAB
Result code^test description

LOINC Code^LOINC description^LN^local code^local description^L
CE R 250
4 Observation sub-ID 0 ST R 20
5 Observation value Result
Example 1 - Hepatitis A IgM test was positive
OBX|1|CE|5182-1^Hepatitis A Virus IgM Serum Antibody EIA^LN||G-A200^Positive^SNM|

Example 2 - antimicrobial susceptibility testing
OBX|1|SN|7059-9^Vancomycin Susceptibility, Gradient Strip^LN||<^1
* C 9999
6 Units Unit of measure CE RE 250
7 Reference ranges Upper and lower limit ST RE 60
8 Abnormal flags Result value - S, I, or R, and should be provided in addition to the numeric value in OBX-5
When findings other than susceptibility results are sent, the abnormal flag should be valued (e.g., "H", "N", or "A")
IS RE 5
11 Observation Result Status F= completed. Correct and final results ID R 1

Notes:

OBX-3 <identifier (ST)> ^ <text (ST)> ^ <name of coding system (IS)> ^ <alternate identifier (ST)> ^ <alternate text (ST)> ^ <name of alternate coding system (IS)>

3.1 LOINC Code.

3.2 Text LOINC description

3.3 Name of Coding System 'LN'

3.4 Alternate Identifier Local code here

3.5 Text Local description here

3.6 Alternate Coding System "L"

It is strongly recommended that OBX-3 be populated with as specific a LOINC® code as possible to prevent any misinterpretation of reported results.

OBX-4 Used for processing but not mapped

OBX-5 Result value. Example for blood culture

For antimicrobial susceptibility testing, the OBX segment would appear as:

OBX|1|SN|7059-9^Vancomycin Susceptibility, Gradient Strip^LN||<^1|...

where OBX-3 uses a LOINC® code and OBX-5 has a numeric value. The value type listed in OBX-2 determines the structure of the reported result here (i.e., SN). The SN data type has the following structure:

<comparator> ^ <num1(NM)> ^ <separator or suffix> ^ <num2 (NM)>

Some examples of the SN representation are:

|>^100| Greater than 100

|^100^-^200| equal to range of 100 through 200

|^1^:^228| ratio of 1 to 128 (e.g., the results of a serological test)

|^2^+| categorical response (e.g., an interpretation of occult blood positivity)

For results of a culture that yielded Neisseria meningitides, OBX-2 would be listed as a coded element(CE) and OBX-5 would appear as:

L-22202^Neisseria meningitidis^SNM|

It is strongly recommended that the data types CE and SN be used whenever possible to minimize ambiguity in reporting. In those cases where laboratories have a local code which represents a canned comment, the local code can be Version 1.2 23 placed in OBX5 as a CE data type, and the canned comment can be placed in an NTE directly following the OBX segment.

Example:

OBX|1|CE|600-7^Microorganism identified, Blood Culture^LN||^^^SALMPRES^^L|...
NTE|1|L|Numerous colonies of Salmonella were present on culture. A sub-
NTE|2|L|culture was inoculated and sent for further species identification.

OBX-6 Units, for example: |╬╝g/mL^microgram/milliliter^ISO+|

OBX-7 Reference range. If numeric, the values of this field may report several values in one of the following three formats:

  1. lower limit-upper limit when both lower and upper limits are defined, e.g., for potassium "3.5 - 4.5"
  2. > lower limit if no upper limit, e.g., ">10"
  3. < upper limit if no lower limit, e.g., "<15"

OBX-8 Abnormal flags should be used for reporting microbiology sensitivity data. Abnormal flags for antimicrobial sensitivity reporting should conform to the recommendations of National Committee of Clinical Laboratory Standards (NCCLS, http://www.nccls.org). For most reported findings, the allowable values are S, I, or R, and should be provided in addition to the numeric value in OBX-5. For ELR, when findings other than susceptibility results are sent, the abnormal flag should be valued (e.g., "H", "N", or "A") to distinguish between tests that are interpreted as normal and those that are interpreted as abnormal.

OBX-11 Value Type refers to the content.

APPENDIX I: NTE Segment

The optional Notes and Comments (NTE) segment is allowed to repeat and may be inserted after any of the OBX segments. The note segment applies to the information in the segment that immediately precedes it, i.e., the observation reported in the preceding OBX segment. The NTE segment can carry any text relevant to the event or the observation and can give its source. The NTE segment is not further defined by HL7.

SEQ NAME HHIC Use TYPE R/O LEN
1 Set ID NTE SI O 4
2 Source of Comment Used when source of comment must be identified ID X 8
3 Comment Comment FT RE 65536
4 Comment Type   CE O 250

Notes:

NTE-1 This field may be used where multiple NTE segments are included in a message. Their numbering must be described in the application message definition

NTE-2 Used when source of comment must be identified

NTE-3 Contains the comment contained in the segment

NTE-3 Contains a value to identify the type of comment text being sent in the specific comment record.

APPENDIX J: REFERENCES

See Version 2.3 of the Health Level 7 standard for a full description of all messages, segments, and fields. Information regarding HL7 is at www.hl7.org.Exit Disclaimer See ELINCs standards at http://www.chcf.org/projects/2009/elincs.Exit Disclaimer

IMPACT SIIS 2.0 - Implementation Guide for HL7 Messages & Segments

APPENDIX K: SELECTED HL7 Data Types and Segment Sequencing

Data Type Data Type Name Data Type Data Type Name
CE Coded element CQ Composite Quantity with Units
CWE Coded with Exceptions CX Extended Composite Id with Check digit
DT Date DTM Date/Time
EI Entity Identifier ERL Error Location
FC Financial Class FN Family Name
HD Hierarchic Designator ID Coded Values for HL7 Tables
IS Coded value for User-Defined Tables LA2 Location with address variation 2
MSG Message Type NM Numeric
PT Processing Type SAD Street Address
SI Sequence ID ST String
SN Structured Numeric VID Version Identifier
TS Time Stamp XCN Extended Composite ID Number and Name for Persons
XAD Extended Address XTN Extended telephone number
XPN Extended Person Name    

Segment Sequence and Nesting

The sequence of segments in a message instance is indicated by the sequence of segments in the message-structure specification. Braces, { . . . } surrounding a group of segments indicate one or more repetitions of the enclosed group may occur. Brackets, [ . . . ] surrounding a group of segments indicates that the enclosed group is optional. If a group of segments is optional and may repeat it is enclosed in brackets and braces, [ { . . . } ].

MSH

PID

PV1

ORC

OBR

OBX

OBR

OBX

OBX

NTE

APPENDIX L: Optionality of Segments: Designation and Meaning

Usage refers to the optionality of individual segments and groups of segments. The following designations and their meanings are used in message structures:

Value Description Comment
R Required A conforming sending application shall populate all "R" elements with a non-empty value. HHIC shall process (save / print / archive/etc.) or ignore the information conveyed by required elements. HHIC shall not raise an error due to the presence of a required element, but may raise an error due to the absence of a required element.
RE Required but may be empty The element may be missing from the message, but shall be sent by the sending application if there is relevant data to report. A conforming sending application shall be capable of providing all "RE" elements. If the conforming sending application knows the required values for the element, then it shall send that element. If the conforming sending application does not know the required values, then that element will be omitted.
HHIC will be expected to process (save/print/archive/etc.) or ignore data contained in the element, but shall be able to successfully process the message if the element is omitted (no error message should be generated because the element is missing).
X Not supported For conformant sending applications, the element shall not be sent. HHIC shall ignore the element if it is sent. However, HHIC will not generate an application error if it receives the element.
C Conditional - Specific to Message Profile Used only in a shared message-structure specification, i.e., a specification that is shared by multiple Message Profiles. A shared message-structure is defined when the message structures of multiple message types are very similar. The specific usage of these segments is specified in each section where used.

APPENDIX M: Sample ORU Messages

Example 1:

MSH|^~\&|LIS|M|||20090518161040||ORU^R01|91380000032|P|2.3|
PID|||15161516^^^^M||TEST^EMR SAMPLE^||19651015|M||||||||||46456|
PV1||O|XOP||||14516^TEST^PHYSICIAN||LAB||||||||^|||||||||||||||||||||||||||||
ORC|RE|||||||||||||||^|
OBR|||E2905964|^^^ADIF^CBC|||200905041213|||||||200905041223|^|14516^TEST^PHYSICIAN
||||M3
017||||H|F|CBC^ADIF|^^^^^R|^^~^^~^^||||^^|^^|^^||200905041213|
OBX|1|NM|WBC^WBC|1|10.7|10(9)/L|3.5-10.0|H|||C|||200905050732|C^LAB IT|
OBX|1|TX|WBC^WBC|2|*CORRECTED 05/05 AT 0732: ORIGINAL:
5.1||||||C|||200905050732|C^LAB
IT|
OBX|2|NM|RBC^RBC|1|2.96|10(12)/L|4.4-6.0|L|||F|||200905041231|C^LAB IT|
OBX|3|NM|HGB^Hemoglobin|1|10.3|g/dL|14-17|L|||F|||200905041231|C^LAB IT|
OBX|4|NM|HCT^Hematocrit|1|31.4|%|41-51|L|||F|||200905041231|C^LAB IT|
OBX|5|NM|MCV^MCV|1|106.0|fL|80-100|H|||F|||200905041231|C^LAB IT|
OBX|6|NM|MCH^MCH|1|34.8|pg|27-33|H|||F|||200905041231|C^LAB IT|
OBX|7|NM|MCHC^MCHC|1|32.9|g/dL|32-36||||F|||200905041231|C^LAB IT|
OBX|8|NM|RDW^RDW|1|20.4|%|11-15|H|||F|||200905041231|C^LAB IT|
OBX|9|NM|PLTC^Platelet Count|1|58|10(9)/L|150-450|L|||F|||200905041231|C^LAB IT|
OBX|10|NM|MPV^MPV|1|12.5|fL|6.9-10.9|H|||F|||200905041231|C^LAB IT|
OBX|11|TX|DFTYP^Diff Method|1|Auto||||||F|||200905041231|C^LAB IT|
OBX|12|NM|ANEUT^Neutrophils|1|69|%|40-70||||F|||200905041231|C^LAB IT|
OBX|13|NM|ALYM^Lymphs|1|17|%|20-45|L|||F|||200905041231|C^LAB IT|
OBX|14|NM|AMONO^Monocytes|1|11|%|4-10|H|||F|||200905041231|C^LAB IT|
OBX|15|NM|AEOS^Eosinophils|1|3|%|0-6||||F|||200905041231|C^LAB IT|
OBX|16|NM|ABASO^Basophils|1|0|%|0-2||||F|||200905041231|C^LAB IT|
OBX|17|NM|ANEUTA^Neutrophils, Absolute|1|3.52|10(9)/L|1.4-7.0||||F|||200905041231|C^LAB
IT|
OBX|18|NM|ALYMA^Lymphs, Absolute|1|0.86|10(9)/L|0.7-4.5||||F|||200905041231|C^LAB IT|
OBX|19|NM|AMONOA^Monocytes, Absolute|1|0.55|10(9)/L|0.1-1.0||||F|||200905041231|C^LAB IT|
OBX|20|NM|AEOSA^Eosinophils, Absolute|1|0.13|10(9)/L|0-0.6||||F|||200905041231|C^LAB IT|
OBX|21|NM|ABASOA^Basophils, Absolute|1|0.02|10(9)/L|0-0.2||||F|||200905041231|C^LAB IT|

Example 2:

MSH|^~\&|LIS|M|||20090518161040||ORU^R01|91380000033|P|2.3|
PID|||15161516^^^^M||TEST^EMR SAMPLE^||19651015|M||||||||||46456|
PV1||O|XOP||||14516^TEST^PHYSICIAN||LAB||||||||^|||||||||||||||||||||||||||||v ORC|RE|||||||||||||||^|
OBR|||E2905966|^^^HA1C^HemoglobinA1C|||200905041213|||||||200905041223|^|14516^TEST
^PHYSICIAN||||M3017||||RL|F|HA1C^HA1C|^^^^^R|^^~^^~^^||||^^|^^|^^||200905041213|
OBX|1|NM|HA1C^Hemoglobin A1C|1|2.8|%|4.0-6.0|L|||F|||200905041232|C^LAB IT|
OBX|1|TX|HA1C^Hemoglobin A1C|2|Note: Values <7% meet the treatment goal for patients with
diabetes|||||||||200905041232|C^LAB IT|
OBX|1|TX|HA1C^Hemoglobin A1C|3| mellitus.|||||||||200905041232|C^LAB IT|
MSH|^~\&|LIS|M|||20090518161041||ORU^R01|91380000034|P|2.3|
PID|||15161516^^^^M||TEST^EMR SAMPLE^||19651015|M||||||||||46456|
PV1||O|XOP||||14516^TEST^PHYSICIAN||LAB||||||||^|||||||||||||||||||||||||||||
ORC|RE|||||||||||||||^|
OBR|||E2905965|^^^UMIC^Urinalysis|||200905041213|||||||200905041223|^|14516^TEST^PHYSICIA N
||||M3017||||HU|F|UA^UMIC|^^^^^R|^^~^^~^^||||^^|^^|^^||200905041213| OBX|1|TX|UCOL^Color|1|Yellow||||||F|||200905041241|C^LAB IT|
OBX|2|TX|UAPP^Appearance|1|Clear||||||F|||200905041241|C^LAB IT|
OBX|3|NM|USGB^Specific Gravity|1|1.030||1.005-1.030||||C|||200905050733|C^LAB IT|v OBX|3|TX|USGB^Specific Gravity|2|*CORRECTED 05/05 AT 0733: ORIGINAL:v 1.015||||||C|||200905050733|C^LAB IT|
OBX|4|TX|UESTB^Leukocyte Esterase|1|Negative||NEG||||F|||200905041241|C^LAB IT|
OBX|5|TX|UNITB^Nitrite|1|Positive||NEG|A|||C|||200905050733|C^LAB IT|
OBX|5|TX|UNITB^Nitrite|2|*CORRECTED 05/05 AT 0733: ORIGINAL:
Negative||||||C|||200905050733|C^LAB IT|
OBX|6|NM|UPHB^PH|1|7.0||5.0-7.5||||F|||200905041241|C^LAB IT|
OBX|7|TX|UPRTB^Protein|1|Negative|mg/dL|NEG||||F|||200905041241|C^LAB IT|
OBX|8|TX|UGLB^Glucose|1|Negative|mg/dL|NEG||||F|||200905041241|C^LAB IT|
OBX|9|TX|UKETB^Ketones|1|Negative|mg/dL|NEG||||F|||200905041241|C^LAB IT|
OBX|10|NM|UROB^Urobilinogen|1|0.2|EU/dL|0.2-1.0||||F|||200905041241|C^LAB IT|
OBX|11|TX|UBILB^Bilirubin|1|Positive||NEG|A|||C|||200905050733|C^LAB IT|
OBX|11|TX|UBILB^Bilirubin|2|*CORRECTED 05/05 AT 0733: ORIGINAL:
Negative||||||C|||200905050733|C^LAB IT|
OBX|12|TX|UBLDB^Blood|1|Negative||NEG||||F|||200905041241|C^LAB IT|
OBX|13|TX|UWBC^WBC|1|0-1|/hpf|0-5||||F|||200905041241|C^LAB IT|
OBX|14|TX|URBC^RBC|1|0-2|/hpf|0-2||||F|||200905041241|C^LAB IT|
OBX|15|TX|UBAC^Bacteria|1|None|/hpf|NONE||||F|||200905041241|C^LAB IT|
OBX|16|TX|UMUC^Mucus|1|None|/lpf|||||F|||200905041241|C^LAB IT|
OBX|17|TX|USQEP^Squamous Ep|1|Occ|/lpf|||||F|||200905041241|C^LAB IT|
OBX|18|TX|UCOM^Comments|1|CLEAN CATCH||||||F|||200905041241|C^LAB IT|

Example 3:


MSH|^~\&|LIS|M|||20090518161041||ORU^R01|91380000035|P|2.3|
PID|||15161516^^^^M||TEST^EMR SAMPLE^||19651015|M||||||||||46456|
PV1||O|XOP||||14516^TEST^PHYSICIAN||LAB||||||||^|||||||||||||||||||||||||||||
ORC|RE|||||||||||||||^|
OBR|||E2905967|^^^ZZ01^Wound Cult,
Aero|||200905041213|||||||200905041223|^Leg|14516^TEST^PHYSICIAN||||M3018||||MC|F|WNDAE^Z
Z01|^^^^^R|^^~^^~^^||||^^|^^|^^||200905041213|
OBX|1|TX|SDES^Specimen Description|1|Leg||||||F|||200905041228|C^LAB IT|
OBX|2|TX|SREQ^Special Requests|1|None||||||F|||200905041228|C^LAB IT|
OBX|3|TX|CULT^Culture|1|Many (4+) Proteus mirabilis||||||F|||200905050758|C^LAB IT|
OBX|3|TX|CULT^Culture|2|Mod (3+) **Corrected Micro Report** Rhodotorula glutinis (
Previously|||||||||200905050758|C^LAB IT|
OBX|3|TX|CULT^Culture|3| reported as: Rhodotorula rubra|||||||||200905050758|C^LAB IT|
OBX|3|TX|CULT^Culture|4|Mod (3+) Pseudomonas aeruginosa|||||||||200905050758|C^LAB IT|
OBX|3|ST|CULT^Culture|5|. . . . . . . . . . . . COMMENT . . . . . . . . . .
.|||||||||200905050758|C^LAB IT|
OBX|3|ST|CULT^Culture|6|Called to: Dr office and XOP/Ruth @ 05/05/2009 07:58AM By:
SG2515|||||||||200905050758|C^LAB IT|
OBX|3|ST|CULT^Culture|7|Read back done and verified as correct.|||||||||200905050758|C^LAB IT|
OBX|4|TX|RPT^Report Status|1|Final 05/05/2009||||||F|||200905050758|C^LAB IT|
OBX|5|TX|ORG^Organism|1|Many (4+) Proteus mirabilis||||||F|||200905041245|C^LAB IT|
OBX|6|TX|MTYP^Method|1|Kirby Bauer||||||F|||200905041245|C^LAB IT|
OBX|7|TX|AUG^Amox/k Clav'ate|1|Susceptible|||SS^|||F|||200905041245|C^LAB IT|
OBX|8|TX|AMPI^Ampicillin|1|Susceptible|||SS^|||F|||200905041245|C^LAB IT|
OBX|9|TX|CFZ^Cefazolin|1|Susceptible|||SS^|||F|||200905041245|C^LAB IT|
OBX|10|TX|CTN^Cefotetan|1|Susceptible|||SS^|||F|||200905041245|C^LAB IT|
OBX|11|TX|CAX^Ceftriaxone|1|Susceptible|||SS^|||F|||200905041245|C^LAB IT|
OBX|12|TX|CIP^Ciprofloxacin|1|Susceptible|||SS^|||F|||200905041245|C^LAB IT|
OBX|13|TX|GM^Gentamicin|1|Intermediate|||I^|||F|||200905041245|C^LAB IT|
OBX|14|TX|TE^Tetracycline|1|Resistant|||R^|||F|||200905041245|C^LAB IT|
OBX|15|TX|TS^Trimeth/sulfa|1|Susceptible|||SS^|||F|||200905041245|C^LAB IT|
OBX|16|TX|ORG^Organism|1|Mod (3+) Pseudomonas aeruginosa||||||F|||200905050758|C^LAB IT|
OBX|17|TX|MTYP^Method|1|MIC (ug/mL)||||||F|||200905050758|C^LAB IT|
OBX|18|TX|AK^Amikacin|1|2 Susceptible|||SS^|||F|||200905050758|C^LAB IT|
OBX|19|TX|AZT^Aztreonam|1|14 Intermediate|||I^|||F|||200905050758|C^LAB IT|
OBX|20|TX|CAZ^Ceftazidime|1|1 Susceptible|||SS^|||F|||200905050758|C^LAB IT|
OBX|21|TX|CAX^Ceftriaxone|1|1 Susceptible|||SS^|||F|||200905050758|C^LAB IT|
OBX|22|TX|CIP^Ciprofloxacin|1|<1 Susceptible|||SS^|||F|||200905050758|C^LAB IT|
OBX|23|TX|GM^Gentamicin|1|10 Resistant|||R^|||F|||200905050758|C^LAB IT|
OBX|24|TX|IMP^Imipenem|1|2 Susceptible|||SS^|||F|||200905050758|C^LAB IT|
OBX|25|TX|TZP^Piperacillin/Tazo|1|1 Susceptible|||SS^|||F|||200905050758|C^LAB IT|
OBX|26|TX|TIM^Ticar/k Clav'ate|1|2 Susceptible|||SS^|||F|||200905050758|C^LAB IT|
OBX|27|TX|TO^Tobramycin|1|6 Intermediate|||I^|||F|||200905050758|C^LAB IT|

APPENDIX N: HHIC Use Only - Edits Applied After Receipt

Proposed Edits Applied During or After Receipt of the Data File

Duplicate Laboratory Record

Two or more laboratory records were submitted representing the same laboratory test collected at the same date and time.

Resolution: Remove duplicate laboratory records so only one valid laboratory record exists for a single laboratory test collected at a specified date and time.

Failure to Link Laboratory Record with Discharge Record

The laboratory record did not link to a unique inpatient discharge record. The fields used to perform this link are the Medical/Health Record Number, Admission Date, and Account Number.

Resolution: Verify and correct the Medical/Health Record Number, Admission Date, and Account Number.

Admission Lab Algorithm

For the purpose of improving the severity of illness model, the admission lab results will be incorporated into existing risk models, e.g. 3M's APR-DRGs or other appropriate models. While lab results throughout the inpatient stay may be found to have an important predictive component, the results of selected admission labs (the 32 identified for this study) are known to improve the predictive power of existing risk models such as 3M's APRDRGs. Thus, the admission lab results of the 32 lab tests identified for this study will be identified for this purpose. HHIC will use the following algorithm.2

The first lab value on the day of admission will be used as the "admission lab" because it is most likely to reflect the patient's status prior to any major interventions. If a value is not available, particularly if the patient was admitted late in the day (e.g., after 6 PM), then next day values will be used if no major procedure is documented on the day of admission. If no value is available using this algorithm, a value within seven days prior to admission that is closest to the day of admission can be used. Otherwise, the value will be considered missing.

Future Validations/Definitions/Edits

Further validations and edits will be applied over the course of working with data files. They will be published as they are incorporated.

2 The proposed algorithm is subject to change following as we work with providers and work with data in more detail.

Notes:


Internet Citation: HL7 Implementation Guide. Healthcare Cost and Utilization Project (HCUP). July 2016. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/datainnovations/clinicalcontentenhancementtoolkit/hi6.jsp.
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