description: Records head circumference observations in the Irish healthcare context. package_name: nostalgic-ie.fhir.core derivation: constraint name: IECoreHeadCircumference type: Observation elements: code: pattern: type: CodeableConcept value: coding: - {code: 9843-4, system: 'http://loinc.org', display: Head Occipital-frontal circumference} index: 0 value: choices: [valueQuantity] index: 2 valueQuantity: {type: Quantity, choiceOf: value, index: 3} value[x]: elements: value: {mustSupport: true, index: 4} unit: {mustSupport: true, index: 5} system: pattern: {type: Uri, value: 'http://unitsofmeasure.org'} index: 6 code: {index: 7} required: [value, unit, system, code] package_version: 0.2.0 class: profile kind: resource url: https://hl7-ie.github.io/ie-core/fhir/ie/core/StructureDefinition/ie-core-head-circumference base: https://hl7-ie.github.io/ie-core/fhir/ie/core/StructureDefinition/ie-core-vital-signs version: 0.2.0