Medical Abbreviations Starting With "O"
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| Medical Abbreviation | Meaning |
|---|---|
| o | none, without |
| o | Nothing |
| o | opening |
| o | oral |
| o | oxygen |
| o | pint |
| o bifurcum | oesophagostomum bifurcum |
| o brumpti | oesophagostomum brumpti |
| o circumcincta | ostertagia circumcincta |
| O/E | On examination |
| o/p | oropharynx |
| O&P | Ova and parasites |
| o+p | ova & parasites |
| O2 | Oxygen |
| o3 | ozone |
| oa | esophageal atresia |
| oa | obstructive apnea |
| oa | occipital artery |
| oa | occipitoanterior |
| oa | occupational asthma |
| oa | octanoic acid |
| oa | ocular albinism |
| oa | old age |
| oa | oleic acid |
| oa | optic atrophy |
| oa | orotic acid |
| OA | Osteoarthritis |
| oa | ovalbumin |
| oa | oxalic acid |
| oa1 | x linked ocular albinism |
| OAA | Old Age Assistance |
| oabp | organic anion binding protein |
| oac | oroantral communication |
| oad | obscure auditory dysfunction |
| oad | obstructive airway disease |
| oad | test battery for obscure auditory dysfunction |
| oae | oto acoustic emission test |
| oaf | oroantral fistula |
| oaf | osteoclast activating factor |
| oafns | oculoauriculofrontonasal syndrome |
| oap | oncovin, ara c, prednisone |
| oap | osteoarthropathy |
| oap-bleo | oncovin, ara c, prednisone, bleomycin |
| oar | albinism, ocular, autosomal recessive |
| OASDHI | Old Age Survivors, Disability, and Health Insurance Program |
| oasis | hcfa's outcome and assessment information set |
| oat | ornithine oxo acid aminotransferase deficiency |
| oav dysplasia | oculoauriculovertebral dysplasia |
| oavs | oculoauriculovertebral spectrum |
| ob | esophageal biopsy |
| ob | obese |
| ob | obliterative bronchiolitis |
| ob | obstetrical |
| ob | obstetrician |
| ob | obstetrics |
| ob | occult bleeding |
| ob | occult blood |
| ob | olfactory bulb |
| ob | oligoclonal band |
| ob | overbite |
| OB-GYN | Obstetrics and Gynecology |
| ob/gyn | obstetrics and gynecology |
| obgyn | obstetrics and gynecology |
| Obl | Oblique |
| obr | ortho bowel routine |
| OBRA | Omnibus Budget Reconciliation Act |
| obs | observation |
| OBS | Organic brain syndrome |
| obst | obstetrical |
| obstr | obstructive |
| oc | oleoresin capsicum |
| oc | only child |
| oc | onychocryptosis |
| oc | optic chiasma |
| oc | oral contraceptive |
| oc | organ culture |
| oc | osteocalcin |
| oc | ovarian cancer |
| oca | oculocutaneous albinism |
| oca | olivopontocerebellar atrophy |
| oca | oral contraceptive agent |
| oca | ovarian carcinoma |
| ocairs | occupational case analysis and interview rating scale |
| Occ | Occasional |
| occ | occipital |
| occip | occipital |
| occlus | occlusive |
| occr | ovarian cancer cluster region |
| occs | oculocerebrocutaneous syndrome |
| occup | occupational |
| OCD | Obsessive-compulsive disorder |
| ocd | osteochondritis dissecans |
| OCG | Oral cholecystogram |
| ocl | oral colonic lavage |
| OCNA | Old chart not available - Medical history |
| OCP | Oral contraceptive pill |
| ocr | oculocephalic reflex |
| ocrl | lowe oculocerebrorenal syndrome |
| oct | october |
| OCT | Optical Coherence Tomography |
| oct | ornithine carbamoyltransferase |
| oct | oxytocin challenge test |
| octor | on call to operating room |
| OD | Doctor of Optometry |
| od | Every day, usually regarded as once daily, from the Latin, omni die. Generally written in lower case. |
| od | occipital dysplasia |
| OD | Occupational disease |
| od | ollier disease |
| od | open drainage |
| od | optic disc |
| od | optical density |
| od | osteochondritis dissecans |
| OD | Overdose |
| OD | Right eye from Latin, oculus dexter |
| odap | oxalyldiaminopropionic acid |
| odc | ornithine decarboxylase |
| odc | orotidylate decarboxylase |
| ODD | Oppositional Defiant Disorder |
| odd dysplasia | oculodentodigital dysplasia |
| oddd | oculodentodigital dysplasia |
| odm | ophthalmodynamometry |
| odnp | octadecaneuropeptide |
| odpf | osseous dysplasia, digital, with facial pigmentary defects and multiple frenula |
| ODS | Organized Delivery System |
| odts | organic dust toxic syndrome |
| OE | Otitis externa |
| oed | oral epithelial dysplasia |
| oer | oxygen extraction ratio |
| oett | oral endotracheal tube |
| oetx | oenanthotoxin |
| ofc | occipitofrontal circumference |
| ofd | orofacial digital syndrome |
| ofe | osteolysis, familial expansile |
| ofg | orofacial granulomatosis |
| ofs | occasions for smoking scale |
| og | esophagogastrectomy |
| og | oligodendrocyte |
| og | onychogryphosis |
| og | orogastric |
| ogc | oxoglutarate carrier |
| ogd | esophagogastroduodenoscopy |
| ogs | opitz g syndrome |
| ogs | osteogenic sarcoma |
| OGTT | Oral glucose tolerance test |
| oh | hydroxide |
| oh | hydroxycorticosteroid |
| oh | hydroxyl group |
| oh | hydroxyl radical |
| oh | obstetric history |
| oh | occupational health |
| oh | occupational history |
| oh | ocular hypertension |
| ohc | outer hair cell |
| ohcc | 25 hydroxycholecalciferol |
| ohcs | 17 hydroxcorticosteroids |
| ohd | organic heart disease |
| ohda | hydroxydopamine |
| ohe | oral health education |
| oher | office of health and environmental research |
| ohf | omsk hemorrhagic fever |
| ohi | oral hygiene instruction |
| OHL | Oral hairy leukoplakia |
| ohm | onychomadesis |
| ohp | hydroxyprogesterone |
| ohrp | office of human research protection |
| ohs | overhydrated hereditary stomatocytosis |
| oht | ocular hypertension |
| oi | opportunistic infection |
| oi | osteogenesis imperfecta |
| oic | osteogenesis imperfecta congenita |
| Oint | Ointment |
| oirda | intermittent rhythmic delta activity |
| oit | osteogenesis imperfecta tarda |
| oj | orange juice |
| oj | overjet |
| ok | odontogenic keratocyst |
| okn | optieokinetic nystagmus |
| okn | optokinetic nystagmus |
| okt10 | ortho kung t10 |
| okt11 | ortho kung t11 |
| okt3 | ortho kung t3 |
| okt4 | ortho kung t4 |
| okt6 | ortho kung t6 |
| okt8 | ortho kung t8 |
| ol | left eye |
| olb | open lung biopsy |
| old | occupational lung disease |
| ole | object linking and embedding |
| oled | organic light emitting device |
| olp | oral lichen planus |
| olt | orthotopic liver transplant |
| olv | one lung ventilation |
| om | esophageal manometry |
| om | Every morning, from the Latin, omni mane. Generally written in lower case. |
| om | occipitomental projection |
| om | occupational medicine |
| om | ocular movement |
| om | onychomycosis |
| om | osborne mendel rat |
| om | osteomalacia |
| om | osteomyelitis |
| om | osteopathic manipulation |
| OM | Otitis media |
| OMA | Ocular Motor Apraxia |
| omad | oncovin, methotrexate, adriamycin, dactinomycin |
| OMB | Office of Management and Budget |
| omc | open mitral commissurotomy |
| ome | otitis media with effusion |
| OME | Otitis Media with Effusion - fluid in the inner ear without other symptoms. |
| omi | old myocardial infarction |
| omim | online mendelian inheritance in man |
| omp | olfactory marker protein |
| omp | outer membrane protein |
| ompa | octamethyl pyrophosphoramide |
| ompa | otitis media, pharyngitis, adenitis |
| oms | organic mental syndrome |
| omv | open mitral valvotomy |
| on | Every night, from the Latin, omni nocte. Generally written in lower case. |
| on | optic neuritis |
| onc | oncology |
| ONG | Orthodontic National Group |
| onh | optic nerve hypoplasia |
| onn | o'nyong nyong fever |
| OOB | Out of bed |
| ooh | out of hospital |
| oors | oculootoradial syndrome |
| op | esophageal pressure |
| op | occipitoposterior position |
| op | operation |
| op | operative procedure |
| op | operator |
| op | ophthalmology |
| op | opponens pollicis |
| op | oropharynx |
| op | orthostatic proteinuria |
| op | osmotic pressure |
| op | osteoporosis |
| op | outpatient |
| OP | Outpatient department |
| opa | oropharyngeal airway |
| opal | oncovin, prednisone, l asparaginase |
| OPC | Oropharyngeal Candidiasis |
| opc | outpatient clinic |
| OPCA | Olivopontocerebellar atrophy |
| opd | otopalatodigital |
| OPD | Outpatient department |
| opem | ophthalmoplegia, external, and myopia |
| open | oncovin, prednisone, etoposide, novantrone |
| opg | ocular plethysmography |
| opg | orthopantomogram |
| ophi | occupational performance history interview |
| OPHP | Office of Public Health Preparedness |
| ophth | ophthalmology |
| opmd | oculopharyngeal muscular dystrophy |
| opn | operation |
| opns | operations |
| opo | organ procurement organization |
| opp | oncovin, procarbazine, prednisone |
| oppa | oncovin, procarbazine, prednisone, adriamycin |
| OPPT | Oriented to person place and time |
| oprr | office of protection from res risks |
| oprt | orotate phosphoribosyltransferase |
| opsi | overwhelming post splenectomy infection |
| opt | orthopantomogram |
| opv | oral polio vaccine |
| OPV | Outpatient visit |
| or | estrogen receptor |
| or | oocyte retrieval |
| or | open reduction |
| OR | Operating room |
| or | optic radiation |
| or | oral rehydration |
| or-if | open reduction with internal fixation |
| orb | object request broker |
| orbc | octadecyl rhodamine b chloride |
| orf | open reading frame |
| ORIF | Open reduction internal fixation |
| orn | ornithine |
| ornl | oak ridge national laboratory |
| ors | oral rehydration salts |
| ORSA | Oxacillin-resistant staphylococcus aureus |
| ort | operating room technician |
| ORT | Oral rehydration therapy |
| ortho | orthopaedic surgery |
| os | esophageal spasm |
| OS | Left eye from Latin, oculus sinister |
| os | mouth |
| os | occipitosacral |
| os | opening snap |
| OS | Orthopedic surgery |
| os | overall survival |
| OSA | Obstructive sleep apnea |
| osbd | oral selective bowel decontamination |
| oscs | osteopathia striata with cranial sclerosis |
| osfecn | osmium ferricyanide |
| OSH | Outside hospital |
| OSHA | Occupational Health and Safety Administration |
| osi | open systems interconnection |
| Osm | Osmolarity |
| osrc | osteosarcoma |
| Osteo | Osteomyelitis |
| ostm | osteomyelitis |
| osx | opitz syndrome, x linked |
| ot | ear |
| OT | Occupational therapy |
| ot | old tuberculin |
| ot | operating theater |
| ot | optic tract |
| ota | office of technology assessment |
| OTA | Orthodontic Technicians Association |
| otc | off the case |
| otc | ornithine transcarbamylase |
| OTC | Over-the-counter drug |
| otc | oxytetracycline |
| otd | oculotrichodysplasia |
| OTD | Out the Door (discharged) |
| oto | otolaryngology |
| oto | otology |
| oto | otorhinolaryngology |
| otoh | on the other hand |
| OTPP | Oriented to time place and person |
| ots | otosclerosis |
| ots | us epa office of toxic substances |
| ott | office of technology transfer |
| otudp | odontotrichoungual digital palmar syndrome |
| OU | Both eyes, from Latin, oculi uterque |
| ou | esophageal ulcer |
| ou | urine output |
| ov | esophageal varices |
| OV | Office Visit |
| ovd | occlusal vertical dimension |
| ovr | oculovestibular reflex |
| ow | oval window |
| ox | onychauxic |
| oxphos | oxidative phosphorylation |
| oxy | oxygen |
| oxyhba | oxyhemoglobin a |
| oxyhbs | oxyhemoglobin s |
| oz | Ounce |