List of medical abbreviations: O

Sortable table
Abbreviation Meaning
oNothing
[ō—letter o with overbar]
O2oxygen
OAosteoarthritis
OABOveractive bladder
OAFosteoclast activating factor
OBOccult blood
OB
OB-GYN
ob-gyne
obstetrics and gynecology
Obloblique
OBSorganic brain syndrome
Occoccasional
OCDobsessive-compulsive disorder
OCGoral cholecystogram
OCNAOrthopedic Clinics of North America
OCPoral contraceptive pill
OCToptical coherence tomography
ODright eye (from Latin oculus dexter)
overdose
occupational disease
odevery day, usually regarded as once daily (from Latin omni die). Generally written in lowercase.
ODCornithine decarboxylase
OEotitis externa
O/Eon examination
OGTToral glucose tolerance test
OHLoral hairy leukoplakia
OHSObesity hypoventilation syndrome
OHTOrthotopic heart transplantation
Ointointment
OMotitis media
omevery morning (from Latin omni mane). Generally written in lowercase.
OMEotitis 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
OPoutpatient department
Osteoporosis
O&Pova and parasites
OPDoutpatient department
OPPToriented to person, place, and time
OPVoutpatient visit
ORoperating room (aka operating theatre)
odds ratio
ORIFopen reduction internal fixation
ORSAoxacillin-resistant staphylococcus aureus
ORToral rehydration therapy
OSleft eye (from Latin oculus sinister)
orthopedic surgery
overall survival
OSAobstructive sleep apnea
OSHoutside hospital
Osmosmolarity
Osteoosteomyelitis
OToccupational therapy
OTCover-the-counter drug
OTDout the door (discharged)
OTPPoriented to time, place, and person
OTTROrgan Transplant Tracking Record
OUboth eyes (from Latin oculi uterque)
OVoffice visit (see ambulatory care)
ozounce
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