| parent | Vitamin A | LP31687-4 |
| child | Retinal | LP15851-6 |
| child | Retinol | Blood | Chemistry - non-challenge | LP385102-1 |
| child | Retinol | Feed | Chemistry - non-challenge | LP385103-9 |
| child | Retinoate | LP15852-4 |
| child | Retinol | Liver | Chemistry - non-challenge | LP385104-7 |
| child | Retinol | Serum or Plasma | Chemistry - non-challenge | LP385105-4 |
| child | Retinol | Tissue and Smears | Chemistry - non-challenge | LP385106-2 |
| parent | Vitamin A | LP31687-4 |
| child | Retinol | Serum or Plasma | Chemistry - challenge | LP387167-2 |
| PartDisplayName | en-US | Retinol |
| DisplayName | en-US | Retinol |
LOINC Version: 2.77
FHIR