| parent | Tetrahydrobiopterin | LP31556-1 |
| child | Tetrahydrobiopterin/Biopterin | Urine | Chemistry - non-challenge | LP384316-8 |
| STATUS | ACTIVE |
| PartDisplayName | en-US | Tetrahydrobiopterin/Biopterin |
| DisplayName | en-US | Tetrahydrobiopterin/Biopterin |
LOINC Version: 2.81