description: Extension providing radiobiologic dose metric using a regular expression:\n BED,\n CGE,\n RBE,\n RBE(factor = \\),\n EQD2Gy,\n EQD2Gy(a/b = \\).
package_name: hl7.fhir.us.codex
derivation: constraint
name: RadiobiologicMetric
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiobiologic-metric'}
    index: 1
  value:
    choices: [valueQuantity]
    index: 3
  valueQuantity: {type: Quantity, choiceOf: value, index: 4}
  value[x]:
    elements:
      value: {index: 5}
      unit:
        constraint:
          TG263RadiobiologicMetric: {human: Unit SHOULD match TG-263 Radiobiologic Metric Regexp, source: 'http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiobiologic-metric', severity: warning, expression: '$this.toString().matches(''^(BED|CGE|RBE|RBE\\(factor\\s*=\\s*(\\d?(\\.\\d+)?)\\)|EQD2Gy|EQD2Gy\\(a\\/b\\s*=\\s*(\\d?(\\.\\d+)?)\\))$'')'}
        index: 6
    required: [value, unit]
package_version: radiation-therapy-2.0.0
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiobiologic-metric
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 2.0.0
required: [value, valueQuantity]