Using CQL with FHIR
1.0.0 - STU1 International flag

This page is part of the Using CQL with FHIR Implementation Guide (v1.0.0: STU1) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions

Library: Parameter Example (Experimental)

Official URL: http://hl7.org/fhir/uv/cql/Library/ParameterExample Version: 1.0.0
Active as of 2024-05-31 Computable Name: ParameterExample
Other Identifiers: OID:2.16.840.1.113883.4.642.40.37.28.5

Example CQL library with a parameter defined, used to illustrate calling the $cql and Library/$evaluate operations with libraries that have parameters

Related Artifacts

depends-onFHIR model informationhttp://fhir.org/guides/cqf/common/Library/FHIR-ModelInfo|4.0.1
depends-onLibrary FHIRHelpershttp://fhir.org/guides/cqf/common/Library/FHIRHelpers|4.0.1
depends-onCode system LOINCLogical Observation Identifiers, Names and Codes (LOINC)

Parameters

GlucoseThresholdin01Quantity
Patientout01Patient
Blood Glucose Observationsout0*Observation

Data Requirements

Type: Patient (Patient)
Type: Observation (Observation)
FilterValue
codeOne of these codes: Logical Observation Identifiers, Names and Codes (LOINC) 2339-0: Glucose Bld-mCnc

Contents

text/cql

library ParameterExample

using FHIR version '4.0.1'

include FHIRHelpers version '4.0.1'

codesystem LOINC: 'http://loinc.org'
code "Blood Glucose": '2339-0' from LOINC display 'Glucose Bld-mCnc'

parameter GlucoseThreshold Quantity

context Patient

define "Blood Glucose Observations":
  [Observation: "Blood Glucose"] BG
    where BG.value > GlucoseThreshold

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