| IOH | idiopathic orthostatic hypotension |
|---|---|
| IPF | idiopathic pulmonary fibrosis; infection-potentiating factor; interstitial pulmonary fibrosis |
| IRDS | idiopathic respiratory distress syndrome; infant respiratory distress syndrome |
| IRF | idiopathic retroperitoneal fibrosis; impulse response function; interferon regulatory factor; intern... |
| IRSA | idiopathic refractory sideroblastic anemia; iodinated rat serum albumin |