| parent | Gastrointestinal function | LP31419-2 |
| child | Gastric acid.free | LP29054-1 |
| child | Gastric acid | Gastric fluid | Chemistry - non-challenge | LP386734-0 |
| STATUS | ACTIVE |
| PartDisplayName | en-US | Gastric acid |
| DisplayName | en-US | Gastric acid |
LOINC Version: 2.81