| parent | Hydrogen | LP15643-7 |
| child | Hydrogen ion | Blood | Chemistry - non-challenge | LP386741-5 |
| child | Hydrogen ion | Blood arterial | Chemistry - non-challenge | LP386742-3 |
| child | Hydrogen ion | Blood capillary | Chemistry - non-challenge | LP386743-1 |
| child | Hydrogen ion | Blood cord | Chemistry - non-challenge | LP386744-9 |
| child | Hydrogen ion | Blood cord arterial | Chemistry - non-challenge | LP386745-6 |
| child | Hydrogen ion | Blood cord mixed venous | Chemistry - non-challenge | LP386746-4 |
| child | Hydrogen ion | Blood cord venous | Chemistry - non-challenge | LP386747-2 |
| child | Hydrogen ion | Blood mixed venous | Chemistry - non-challenge | LP386748-0 |
| child | Hydrogen ion | Blood venous | Chemistry - non-challenge | LP386749-8 |
| child | Hydrogen ion | Serum or Plasma | Chemistry - non-challenge | LP386750-6 |
| STATUS | ACTIVE |
| PartDisplayName | en-US | Hydrogen ion |
| DisplayName | en-US | Hydrogen ion |
LOINC Version: 2.81