List of medical abbreviations: O

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Abbreviation Meaning
o Nothing
[ō—letter o with overbar]
O2 oxygen
OA osteoarthritis
OAB Overactive bladder
OAF osteoclast activating factor
OB Occult blood
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 right eye (from Latin oculus dexter)
occupational disease
od every day, usually regarded as once daily (from Latin omni die). Generally written in lowercase.
ODC ornithine decarboxylase
OE otitis externa
O/E on examination
OGTT oral glucose tolerance test
OHL oral hairy leukoplakia
OHS Obesity hypoventilation syndrome
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)
on every night (from Latin omni nocte). Generally written in lowercase.
O/N overnight
OOB out of bed
OP outpatient department
O&P ova and parasites
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