List of medical abbreviations: O

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AbbreviationMeaning
oNothing
[ō—letter o with overbar]
O2 oxygen
OA osteoarthritis
OAB Overactive bladder
OAFosteoclast activating factor
OBOccult blood
OB
OB-GYN
ob-gyne
obstetrics and gynecology
Obloblique
OBS organic brain syndrome
Occoccasional
OCD obsessive-compulsive disorder
OCGoral cholecystogram
OCNAOrthopedic Clinics of North America
OCP oral contraceptive pill
OCT optical coherence tomography
ODonce daily (from Latin omne in die) [1]
right eye (from Latin oculus dexter)
overdose
occupational disease
ODCornithine decarboxylase
OE otitis externa
O/E on examination
OFC orbitofrontal cortex
OGTT oral glucose tolerance test
OHLoral hairy leukoplakia
OHS Obesity hypoventilation syndrome
OHTOrthotopic heart transplantation
Oint ointment
OM osteomyelitis
otitis media
omevery 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
onevery night (from Latin omni nocte). Generally written in lowercase.
O/Novernight
OOBout 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
OPVoutpatient visit
ORoperating room (aka operating theatre)
odds ratio
ORIF open reduction internal fixation
ORSAoxacillin-resistant staphylococcus aureus
ORToral rehydration therapy
OSleft eye (from Latin oculus sinister)
orthopedic surgery
overall survival
OSA obstructive sleep apnea
OSHoutside hospital
Osm osmolarity
Osteo osteomyelitis
OT occupational therapy
OTC over-the-counter drug
OTDout the door (discharged)
OTPP oriented to time, place, and person
OTTROrgan Transplant Tracking Record
OUboth eyes (from Latin oculi uterque)
OVoffice visit (see ambulatory care)
oz ounce

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References

  1. "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).