| IAF | idiopathic alveolar fibrosis |
|---|---|
| IAH | idiopathic adrenal hyperplasia; implantable artificial heart |
| IAHA | idiopathic autoimmune hemolytic anemia; immune adherence hemagglutination |
| IAHD | idiopathic acquired hemolytic disorder |
| IAN | idiopathic aseptic necrosis; indole acetonitrile |