description: Defines constraints on Observation to represent head circumference observations with a standard LOINC code and UCUM units of measure. This profile is derived from the US Core Vital Signs Profile.
package_name: hl7.fhir.us.core
derivation: constraint
name: USCoreHeadCircumferenceProfile
type: Observation
elements:
  code:
    type: CodeableConcept
    short: Head Circumference
    mustSupport: true
    pattern:
      type: CodeableConcept
      value:
        coding:
        - {code: 9843-4, system: 'http://loinc.org'}
    index: 0
  valueQuantity:
    mustSupport: true
    index: 1
    elements:
      value: {type: decimal, mustSupport: true, index: 2}
      unit: {type: string, mustSupport: true, index: 3}
      system:
        type: uri
        pattern: {type: Uri, value: 'http://unitsofmeasure.org'}
        mustSupport: true
        index: 4
      code:
        type: code
        short: Coded responses from the common UCUM units for vital signs value set.
        binding: {strength: required, valueSet: 'http://hl7.org/fhir/ValueSet/ucum-bodylength|4.0.1'}
        mustSupport: true
        index: 5
    required: [value, unit, system, code]
package_version: 4.1.0
class: profile
kind: resource
url: http://hl7.org/fhir/us/core/StructureDefinition/us-core-head-circumference
base: http://hl7.org/fhir/us/core/StructureDefinition/us-core-vital-signs
version: 4.1.0