| parent | Gastrointestinal function | LP31419-2 |
| child | pH.combined acid | LP17852-2 |
| child | pH total acid | Gastric fluid | Chemistry - non-challenge | LP386765-4 |
| child | pH.free acid | LP29094-7 |
| STATUS | ACTIVE |
| PartDisplayName | en-US | pH.total acid |
| DisplayName | en-US | pH total acid |
LOINC Version: 2.81