| Abbreviation | Definition |
|---|---|
| IGF | Insulin-like Growth Factor |
| IGF-1 | insulin-like growth factor 1 |
| IGFR | Insulin-like growth factor receptor |
| IgG | Immunoglobulin G |
| IGIM | Immune Globulin Intramuscular |
| IGIV | Immune Globulin Intravenous |
| IGL | Inferior Glenohumeral Ligament |
| IGM | immunoglobulin M |
| IGM | immunoglobulins G |
| IGM | immunoglobulins M |
| IGT | Impaired Glucose Tolerance |
| IGV | Intrathoracic Gas Volume |
| IH | Infectious hepatitis |
| IH | Interval History |
| IHCD | I Have Crippling Depression |
| IHD | Ischemic Heart Disease |
| IHH | Idiopathic Hypogonadotropic Hypogonadism |
| IHN | Infectious Haematopoietic Necrosis |
| IHR | Intrinsic heart rate |
| IHRI | Inflammation and Host Response to Injury |