| HPSA | health professional shortage area |
|---|---|
| HTA | heterophil transplantation antigen; human thymocyte antigen; hydroxytryptamine; hypophysiotropic are... |
| LAA | left atrial appendage; left atrial area; leukemia-associated antigen; leukocyte ascorbic acid |
| LACN | local area communications network |
| LAN | local area network; long-acting neuroleptic [agent] |