[ O ]

• O  blood type in the ABO blood group; eye [Lat. oculus]; nonmotile strain of microorganisms [Ger. ohne Hauch]; no response [pacemaker]; objective findings; observed frequency in a contingency table; obstetrics; obvious; occipital electrode placement in electroencephalography; occiput; occlusal; [doctor's] office; often; ohm; old; opening; operator; operon; opium; oral, orally; orange [color]; orderly respirations [anesthesia chart]; ortho-; orthopedics; osteocyte; other; output; ovine; oxygen; pint [Lat. octarius]; respirations [anesthesia chart]; zero
• O₂  both eyes; diatomic oxygen; molecular oxygen
• O₃  ozone
• O125  nonmucinous ovarian tumor antigen
• o  eye [Lat. oculus]; opening; ovary transplant; pint [Lat. octarius]; see omicron
•   negative; without
• ο  see omicron
• Ω  see omega
• ω  see omega
• OA  [o]esophageal atresia; obstructive apnea; occipital artery; occipito-anterior; occiput anterior; occupational asthma; octanoic acid; ocular albinism; old age; okadaic acid; oleic acid; on admission or arrival; open appendectomy; opiate analgesia; ophthalmic artery; opsonic activity; optic atrophy; oral airways; oral alimentation; organic anion; orotic acid; osteoarthritis; osteoarthrosis; ovalbumin; ovarian antibody; overall assessment; Overeaters Anonymous; oxalic acid
• O&A  observation and assessment
• O₂a  oxygen availability
• OAA  Old Age Assistance; Older Americans Act; Opticians Association of America; oxaloacetic acid
• OAAD  ovarian ascorbic acid depletion
• OAAS  observer's assessment alertness/sedation scale
• OAAV  ovine adeno-associated virus
• OAdV  ovine adenovirus
• OAdV-A, B, C  ovine adenoviruses A, B, C
• OAB  old age benefits
• OABP  organic anion binding protein
• OA/BVM  oral airway/bag-valve-mask
• OAC  omeprazole, amoxicillin, clarithromycin
• OACT  occupational activity [UMLS]
• OAD  obstructive airway disease; organic anionic dye
• OADC  oleate-albumin-dextrose-catalase [medium]
• OAE  otoacoustic emission
• OAF  off-axis factor; off-axis ratio [radiotherapy]; open air factor; osteoclast activating factor
• OAFNS  oculo-auriculofrontonasal syndrome
• OAG  open angle glaucoma
• OAH  ovarian androgenic hyperfunction
• OAIS  Outcomes and Information Set
• OAISO  overaction of the ipsilateral superior oblique
• OAK  Kjer optic atrophy
• OALF  organic acid labile fluid
• OALL  ossification of anterior longitudinal ligament
• OAM  Office of Alternative Medicine [NIH]; outer acrosomal membrane
• OAP  Office of Adolescent Pregnancy; old age pension, old age pensioner; ophthalmic artery pressure; osteoarthropathy; oxygen at atmospheric pressure; precocious osteoarthrosis
• OAPP  Office of Adolescent Pregnancy Programs
• OAR  organ at risk; Ottawa ankle rule
• OARS  older Americans resources and services; Optimal Atherectomy Restenosis Study
• OAS  old age security; oral allergy syndrome; osmotically active substance
• OASD  ocular albinism-sensorineural deafness [syndrome]
• OASDHI  Old Age, Survivors, Disability and Health Insurance
• OASDI  Old Age Survivors and Disability Insurance
• OASI  Old Age and Survivors Insurance
• OASIS  Older Adults Service and Information System; Organization to Assess Strategies for Ischemic Syndromes; Outcome and Assessment Information Set
• OASP  organic acid soluble phosphorus
• OAstV  ovine astrovirus
• OAT  O-acetyltransferase; Ochanomizu Aspirin Trial; Open Artery Trial; organic anion transporter; ornithine aminotransferase
• OATL  ornithine aminotransferase-like
• OATR  organism attribute [UMLS]
• OAV  oculoauriculovertebral [dysplasia]
• OAVS  oculo-auriculovertebral syndrome
• OAVD  oculoauriculovertebral dysplasia
• OAW  oral airways
• OB  obese [mouse]; obese, obesity; objective benefit; obliterative bronchiolitis; obstetrics, obstetrician; occult bacteremia; occult bleeding; olfactory bulb; oligoclonal band
• O&B  opium and belladonna
• ob  obese [mouse]
• OBAD  optimal biologically active dose
• OBB  own bed bath; oriented bounding boxes
• OBD  organic brain disease
• OBCAM  opioid-binding cell adhesion molecule
• OBE  Office of Biological Education
• OBET  odor-baited entry trap
• OBF  organ blood flow
• OBG, ObG  obstetrics and gynecology, obstetrician-gynecologist
• OBGS  obstetrical and gynecological surgery
• OB-GYN, ob-gyn  obstetrics and gynecology, obstetrician-gynecologist
• obj  objective
• obl  oblique
• OBMT  omeprazole, bismuth, metronidazole, tetracycline
• OBOV  Obodhiang virus
• OBP  odorant-binding protein; ova, blood, parasites [in stool]
• OBR  obesity gene receptor
• OBRA  Omnibus Reconciliation Act
• OBS  obesity; obstetrical service; organic brain syndrome
• Obs  observation, observed; obstetrics, obstetrician
• obs  obsolete
• Obst  obstetrics, obstetrician
• obst, obstr  obstruction, obstructed
• OB-US  obstetrical ultrasound [examination of the fetus]
• OC  obstetrical conjugate; occlusocervical; oesophageal candidiasis; office call; on call; only child; optic chiasma; oral contraceptive; orbicularis oculi [muscle]; order communication [system]; original claim; organ culture; orofacial cleft; outer canthal [distance]; ovarian cancer; oxygen consumed
• O&C  onset and course
• OCA  octylcyanoacrylate; oculocutaneous albinism; olivopontocerebellar atrophy; oral contraceptive agent
• OCa  ovarian carcinoma
• OCAD  occlusive carotid artery disease
• O₂cap  oxygen capacity
• OCB  obsessive-compulsive behavior
• OCBAS  Optimal Coronary Balloon Angioplasty vs Stent [trial]; Optimal Coronary Balloon Angioplasty with Provisional Stenting vs Primary Stent [trial]
• OCBF  outer cortical blood flow
• OCC  object-centered coordinate [method]; oculocerebrocutaneous [syndrome]; operable case based reasoning [CBR]-oriented case; optimum care committee; oral cholecystography; original component complexes
• occ  occasional; occiput, occipital; occlusion, occlusive; occupation; occurrence
• occas  occasional
• OCCI  oblique clear corneal incision
• occip  occiput, occipital
• occl  occlusion, occlusive
• OCCPR  open chest cardiopulmonary resuscitation
• OccTh  occupational therapy, occupational therapist
• occ ther  occupational therapist or therapy
• occup  occupation, occupational
• occup Rx  occupational therapy
• OCCV  object-centered coordinate [OCC] values
• OCD  obsessive compulsive disorder; Office of Child Development; Office of Civil Defense; osteochondritis dissecans; ovarian cholesterol depletion; oxygen cost diagram
• OCDD  octachlorodibenzo-p-dioxin
• OCF  occipito-frontal [circumference]
• OCG  omnicardiogram; oral cholecystogram
• OCH  oral contraceptive hormone
• OCHAMPUS  Office of Civilian Health and Medical Programs of the Uniformed Services [database]
• OCHS  Office of Cooperative Health Statistics
• OCIS  Oncology Clinical Information System
• OCLC  Ohio Computer Library Center; online computer library center
• OCM  oral contraceptive medication
• OCN  oculomotor nucleus; oncology certified nurse; osteocalcin
• OCOA  Online Cytogenetics of Animals
• OCP  octacalcium phosphate; ocular cicatricial pemphigoid; Onchocerciasis Control Programme [Africa]; oral case presentation; oral contraceptive pill
• OC&P  ova, cysts, and parasites
• OCPD  obsessive compulsive personality disorder
• OCPE  office of clinical practice evaluation
• OCR  oculocardiac reflex; oculocerebrorenal [syndrome]; optical character reader; optical character recognition
• oCRF  ovine corticotropin-releasing factor
• OCRG  oxycardiorespirography
• oCRH  ovine corticotropin-releasing hormone
• OCRL  oculocerebrorenal [syndrome] of Lowe
• OCRM  OpenGALEN Common Reference Model
• OCRS  oculocerebrorenal syndrome
• OCS  occipital condyle syndrome; Ondine's curse syndrome; open canalicular system; oral contraceptive steroid; order communication system; outpatient clinic substation; Oxford Cholesterol Study
• OCSD  oculocraniosomatic disease
• OCSI  orthostatic change in shock index
• OCSP  Oxfordshire Community Stroke Project
• OCT  object classification test; optical coherence tomography; optimal cutting temperature; oral cavity tumor; oral contraceptive therapy; organic cation transporter; ornithine carbamoyltransferase; orthotopic cardiac transplantation; outer canthal distance; oxytocin challenge test
• O-CT  ortho-computed tomography
• OCTD  overlap connective tissue disease
• OCTM  open cavity tympanomastoidectomy
• OCU  observation care unit
• OCV  ordinary conversational voice
• OD  Doctor of Optometry; object dictionary; obtained absorbance; occipital dysplasia; occupational dermatitis; occupational disease; oculodynamic; Ollier disease; on duty; once a day; open drop [anesthesia]; optical density; optimal dose; originally derived; out-of-date; outside diameter; overdose, overdosage; right eye [Lat. oculus dexter]
• O-D  obstacle-dominance
• OD-1  Organ Disease 1 [coronary atherosclerosis multicenter study]
• OD-2  Organ Disease 2 [cerebrovascular atherosclerosis multicenter study]
• O₂D  oxygen delivery
• ODA  office document architecture; open document architecture; overall disease assessment; right occipitoanterior [fetal position, Lat. occipito-dextra anterior]
• ODB  opiate-directed behavior
  O₀ | O₁ | O₂ | O₃

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