List of medical abbreviations: O
Abbreviation | Meaning |
---|---|
o | Nothing [ō—letter o with overbar] |
O2 | oxygen |
OA | osteoarthritis |
OAB | Overactive bladder |
OAF | osteoclast activating factor |
OB | Occult blood |
OB OB-GYN ob-gyne | obstetrics and gynecology |
Obl | oblique |
OBS | organic brain syndrome |
Occ | occasional |
OCD | obsessive-compulsive disorder |
OCG | oral cholecystogram |
OCNA | Orthopedic Clinics of North America |
OCP | oral contraceptive pill |
OCT | optical coherence tomography |
OD | once daily (from Latin omne in die)[1] right eye (from Latin oculus dexter) overdose occupational disease |
od | every day, usually regarded as once daily (from Latin omni die). Sometimes written in lowercase. |
ODC | ornithine decarboxylase |
OE | otitis externa |
O/E | on examination |
OFC | orbitofrontal cortex |
OGTT | oral glucose tolerance test |
OHL | oral hairy leukoplakia |
OHS | Obesity hypoventilation syndrome |
OHT | Orthotopic heart transplantation |
Oint | ointment |
OM | otitis media |
om | every morning (from Latin omni mane). Generally written in lowercase. |
OME | otitis media with effusion (fluid in the inner ear without other symptoms) |
OMS | Opsoclonus-myoclonus syndrome |
on | every night (from Latin omni nocte). Generally written in lowercase. |
O/N | overnight |
OOB | out of bed |
OP | outpatient department Osteoporosis |
O&P | ova and parasites |
OPAT | Outpatient parenteral antibiotic therapy |
OPD | outpatient department |
OPPT | oriented to person, place, and time |
OPV | outpatient visit |
OR | operating room (aka operating theatre) odds ratio |
ORIF | open reduction internal fixation |
ORSA | oxacillin-resistant staphylococcus aureus |
ORT | oral rehydration therapy |
OS | left eye (from Latin oculus sinister) orthopedic surgery overall survival |
OSA | obstructive sleep apnea |
OSH | outside hospital |
Osm | osmolarity |
Osteo | osteomyelitis |
OT | occupational therapy |
OTC | over-the-counter drug |
OTD | out the door (discharged) |
OTPP | oriented to time, place, and person |
OTTR | Organ Transplant Tracking Record |
OU | both eyes (from Latin oculi uterque) |
OV | office visit (see ambulatory care) |
oz | ounce |
References
- "Dosing: BID, TID". Global Antibiotic Research & Development Partnership.
Depending on the drug class and its pharmacokinetic and pharmacodynamic properties, different dosing regimens may be optimal, including once a day (omne in die, OD), twice a day (bis in die, BID) or three times a day (ter in die, TID).
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