medical abbreviations: O

medicine encyclopedia----medical abbreviations: O

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medical abbreviations: O

Abbrev.	Meaning
o	Nothing
O2	Oxygen
OA	Osteoarthritis
OB-GYN	Obstetrics and Gynecology
Obl	Oblique
OBS	Organic brain syndrome
Occ	Occasional
OCD	Obsessive-compulsive disorder
OCG	Oral cholecystogram
OCNA	Old chart not available - Medical history
OCP	Oral contraceptive pill
OCT	Optical Coherence Tomography
OD	Right eye from Latin, oculus dexter Overdose Occupational disease
od	Every day, usually regarded as once daily, from the Latin, omni die. Generally written in lower case.
OE	Otitis externa
O/E	On examination
OGTT	Oral glucose tolerance test
OHL	Oral hairy leukoplakia
Oint	Ointment
OM	Otitis media
om	Every morning, from the Latin, omni mane. Generally written in lower case.
OME	Otitis Media with Effusion - fluid in the inner ear without other symptoms.
on	Every night, from the Latin, omni nocte. Generally written in lower case.
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, operating theatre
ORIF	Open reduction internal fixation
ORSA	Oxacillin-resistant staphylococcus aureus
ORT	Oral rehydration therapy
OS	Left eye from Latin, oculus sinister
OS	Orthopedic surgery
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
OU	Both eyes, from Latin, oculi uterque
oz	Ounce