| parent | Thyroxine | LP15900-1 |
| child | Thyroxine free index | LP28551-7 |
| child | Thyroxine free | DBS | Chemistry - non-challenge | LP381517-4 |
| child | Thyroxine free | Blood cord | Chemistry - non-challenge | LP381518-2 |
| child | Thyroxine.free.gestational | LP433621-2 |
| child | Thyroxine free | Serum or Plasma | Chemistry - non-challenge | LP381519-0 |
| parent | Thyroxine | LP15900-1 |
| child | Thyroxine free | Serum or Plasma | Chemistry - challenge | LP387147-4 |
| PartDisplayName | en-US | Thyroxine.free |
| DisplayName | en-US | Thyroxine free |
LOINC Version: 2.77
FHIR