| AFIP | Armed Forces Institute of Pathology |
|---|---|
| AHA | acetohydroxamic acid; acquired hemolytic anemia; acute hemolytic anemia; American Heart Association;... |
| AHI | active hostility index; Animal Health Institute; apnea-plus-hypopnea index |
| AIBS | American Institute of Biological Sciences |
| AIH | amelogenesis imperfecta, hypomaturation type; American Institute of Homeopathy; artificial inseminat... |