Este conjunto de valores inclui códigos baseados nas seguintes regras:

• Incluir estes códigos, tal como definidos em http://terminology.hl7.org/CodeSystem/v3-NullFlavor

  Código	Ecrã	Definição
  UNK	unknown	**Description:**A proper value is applicable, but not known. **Usage Notes**: This means the actual value is not known. If the only thing that is unknown is how to properly express the value in the necessary constraints (value set, datatype, etc.), then the OTH or UNC flavor should be used. No properties should be included for a datatype with this property unless: 1. Those properties themselves directly translate to a semantic of "unknown". (E.g. a local code sent as a translation that conveys 'unknown') 2. Those properties further qualify the nature of what is unknown. (E.g. specifying a use code of "H" and a URL prefix of "tel:" to convey that it is the home phone number that is unknown.)

• Incluir estes códigos, tal como definidos em http://snomed.info/sct

  Código	Ecrã
  33791000087105	Identifies as nonbinary gender (finding)
  446151000124109	Identifies as male gender (finding)
  446141000124107	Identifies as female gender (finding)
  407377005	Female-to-male transsexual (finding)
  407376001	Male-to-female transsexual (finding)

• Incluir estes códigos, tal como definidos em http://terminology.hl7.org/CodeSystem/data-absent-reason

  Código	Ecrã	Definição
  asked-declined	Asked But Declined	The source was asked but declined to answer.

Este conjunto de valores contém 7 conceitos