| IAEA | International Atomic Energy Agency |
|---|---|
| IAET | International Association for Enterostomal Therapy |
| IAGP | International Association of Geographic Pathology |
| IAGUS | International Association of Genito-Urinary Surgeons |
| IAHS | infection-associated hemophagocytic syndrome; International Association of Hospital Security |
| ISO | International Standard Organisation |
|---|---|
| ISAAC | International Study of Asthma and Allergies In Childhood |
| ISIS-2 | International Study of Infarct Survival |
| IUATLD | International Union Against Tuberculosis and Lung Disease |
| IUPAC | International Union of Pure and Applied Chemistry |