| IAHD | idiopathic acquired hemolytic disorder |
|---|---|
| IAHS | infection-associated hemophagocytic syndrome; International Association of Hospital Security |
| IAI | intra-abdominal infection |
| IAIMS | integrated advanced information management system |
| IAIS | insulin autoimmune syndrome |
| IAM | Institute of Applied Microbiology [Japan]; Institute of Aviation Medicine; internal auditory meatus |
| IAMM | International Association of Medical Museums |
| IAMS | International Association of Microbiological Societies |
| IAN | idiopathic aseptic necrosis; indole acetonitrile |
| iANP | immunoreactive atrial natriuretic peptide |