| ITCP | idiopathic thrombocytopenic purpura |
|---|---|
| ITD | idiopathic torsion dystonia; intensely transfused dialysis; iodothyronine deiodinase |
| ITP | idiopathic thrombocytopenic purpura; immune thrombocytopenia; immunogenic thrombocytopenic purpura; ... |
| IUC | idiopathic ulcerative colitis |
| JIS | Japanese industrial standard; juvenile idiopathic scoliosis |