| IAR | immediate asthma reaction; inhibitory anal reflex; iodine-azide reaction |
|---|---|
| IC50 | inhibitory concentration of 50% |
| ID | identification; iditol dehydrogenase; immunodeficiency; immunodiffusion; immunoglobulin deficiency; ... |
| IJP | inhibitory junction potential; internal jugular pressure |
| IPSC | inhibitory postsynaptic current |