| OGI | oxygen-glucose index |
|---|---|
| OHP | hydroxyprogesterone; hydroxyproline; occupational health plan; Oregon Health Plan; oxygen under high... |
| OI | obturator internus; occasional insomnia; opportunistic infection; opsonic index; orgasmic impairment... |
| OID | optimal immunomodulating dose; Organism Identification Number; oxygen insufflation device |
| OPP | osmotic pressure of plasma; oxygen partial pressure |