| parent | Pterins | LP204179-8 |
| child | Tetrahydrobiopterin/Biopterin | LP287212-7 |
| child | Tetrahydrobiopterin | Cerebral spinal fluid | Chemistry - non-challenge | LP384315-0 |
| STATUS | ACTIVE |
| PartDisplayName | en-US | Tetrahydrobiopterin |
| DisplayName | en-US | Tetrahydrobiopterin |
LOINC Version: 2.81