| HAChT | high affinity choline transport |
|---|---|
| HALC | high affinity-low capacity |
| HAP | Handicapped Aid Program; Hazardous Air Pollutants [List]; hazardous air pollution; health alliance p... |
| HAPC | high-amplitude peristaltic contraction; hospital-acquired penetration contact |
| HAPE | high-altitude pulmonary edema |