HL7 Laboratory Report, published by HL7 International / Orders and Observations. This guide is not an authorized publication; it is the continuous build for version 1.0.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/uv-lab-rep-ig/ and changes regularly. See the Directory of published versions

Implementation notes

Implementation of laboratory panels

The current version of the HL7 Laboratory Report Implementation Guide describes the use of Observations (with hasMember references) and a single instance of DiagnosticReport to support test panels and batteries (e.g. a Full Blood Count) rather than using DiagnosticReport as the grouping mechanism. We believe that the Observation hasMember approach offers a more flexible and intuitive method than using DiagnosticReport(s) for test groups, especially for complex reports such as the example included in the base FHIR R4 specification:

Diagnosticreport-example-ghp.xml - FHIR v4.0.1 (hl7.org)

Implementation of reflex tests

An optional R5 extension of the observation (Observation.triggeredBy-r5) has been pre-adopted in the current version of the HL7 Laboratory Report Implementation Guide. We recommend to use this extension for implementation of the so-called reflex tests, i.e. additional test cases in which more than one test could be used to fulfil a given requirement (order or panel). In such cases Observation.triggeredBy-r5.type should be set to #reflex.

Representation of the microbiology tests

Microbiology tests are often being performed in consecutive steps, e.g. cultivation, possible quantification and subsequent sensitivity testing to antibiotics. Each analytical step depends on the result of the previous step or steps. This current version of the HL7 Laboratory Report Implementation Guide recommends using Observation.hasMember references to express causality of the tests performed by the laboratory as shown in the Microbiology Culture + Susceptibility.

Sharing of previous result values

In some cases the laboratory wants to share previous results for the same patient, same test, same method, and same measurement unit. In this case implementers should use the workflow-supportingInfo extension with the Observation resource. Previous results will be expressed as a separate Observation and linked to the current Observation through the workflow-supportingInfo extension.