description: This profile represents the constraint applied to the Quantity data type by the PS-CA project to use UCUM as the code system for units. Informed by the constraints of the [Quantity IPS-UV profile](http://hl7.org/fhir/uv/ips/StructureDefinition-Quantity-uv-ips.html).
package_name: ca.infoway.io.psca
derivation: constraint
name: QuantityPSCA
type: Quantity
elements:
  system:
    short: UCUM system for units
    pattern: {type: Uri, value: 'http://unitsofmeasure.org'}
    mustSupport: true
    index: 0
  code: {mustSupport: true, index: 1}
package_version: 2.0.0-DFT-Ballot
class: complex-type
kind: complex-type
url: http://fhir.infoway-inforoute.ca/io/psca/StructureDefinition/Quantity-ca-ps
base: http://hl7.org/fhir/StructureDefinition/Quantity
version: null
required: [system, code]