| IOMP | International Organization for Medical Physics |
|---|---|
| ION | ischemic optic neuropathy |
| IOP | improving organizational performance; intraocular pressure |
| IOR | index of response |
| IORT | intraoperative radiotherapy |
| IOS | infant observation scale; International Organization for Standardization |
| IOT | intraocular tension; intraocular transfer; ipsilateral optic tectum |
| IOTA | information overload testing aid |
| IOU | intensive care observation unit; international opacity unit |
| IOUS | intraoperative ultrasound [examination] |