Feel free to use our complete database with charts, tables and examples.
Abbreviation |
Interpretation |
| O | objective |
| opening | |
| eye | |
| oral | |
| office | |
| old | |
| output | |
| often | |
| open | |
| ortho | |
| other | |
| oxygen | |
| zero | |
| OA | Osteoarthritis |
| obstructive apnea | |
| occipital artery | |
| on admission | |
| on arrival | |
| old age | |
| O&A | observation and assessment |
| OAA | Old Age Assistance |
| oxaloacetate | |
| OAB | overactive bladder |
| old age benefits | |
| OAC | oral anticoagulant |
| omeprazole, amoxicillin and clarithromycin | |
| oral activated charcoal | |
| OAD | obstructive airway disease |
| occlusive arterial disease | |
| obliterative airway disease | |
| other articular diseases | |
| obscure auditory dysfunction | |
| OAE | otoacoustic emissions |
| OAF | osteoclast activating factor |
| open air factor | |
| oroantral fistula | |
| OAG | open angle glaucoma |
| Oral Assessment Guide | |
| OAM | omeprazole, amoxicillin, and metronidazole |
| Office of Alternative Medicine | |
| OAP | Ophthalmic Artery Pressure |
| osteoarthropathy | |
| over-anxious patient | |
| OARS | organs at risk |
| OAS | Office of Applied Studies |
| oral allergy syndrome | |
| oral anticoagulants | |
| organic anxiety syndrome | |
| Oral appliances | |
| overall survival | |
| Ostomy Adjustment Scale | |
| OAT | oral anticoagulant therapy |
| Optometry Admission Test | |
| open artery trial | |
| O-acetyltransferase | |
| OAV | oculo-auriculo-vertebral |
| ovine adenovirus | |
| OB | obstetrics |
| occult blood | |
| obese | |
| obesity | |
| occlusion body | |
| olfactory bulb | |
| osteoblast | |
| OBA | office-based anesthesia |
| OBD | obscure digestive bleeding |
| organic brain disease | |
| Opioid bowel dysfunction | |
| OBE | out-of-body experience |
| OBF | ocular blood flow |
| organ blood flow | |
| ovarian blood flow | |
| OBG | obstetrics and gynecology |
| octyl-beta-D-glucopyranoside | |
| OBJ | objective |
| OBL | oblique |
| osteoblast-like | |
| OBP | odorant-binding protein |
| office blood pressure | |
| ova, blood, parasites | |
| OBR | obesity gene receptor |
| ortho bowel routine | |
| OB receptor | |
| OBS | observation |
| organic brain syndrome | |
| observed | |
| obstetrics | |
| obesity | |
| occlusion bodies | |
| OBT | obtained |
| OBW | obese black women |
| open bed warmer | |
| OC | oral contraceptive |
| office call | |
| on call | |
| oral cavity | |
| oral care | |
| only child | |
| occlusion | |
| observed cases | |
| O&C | onset and course |
| OCA | open care area |
| ovarian carcinoma | |
| Obsessive Compulsive Anonymous | |
| oral contraceptive agent | |
| Operative Care Advised | |
| OCB | obstructive chronic bronchitis |
| obsessive-compulsive behavior | |
| oxcarbazepine | |
| OCC | occasional |
| occipital | |
| occlusal | |
| occupation | |
| occurrence | |
| OCCL | occlusion |
| OCCM | open chest cardiac massage |
| OCD | obsessive-compulsive disorder |
| organ-confined disease | |
| OCE | outpatient code editor |
| oral conjugated estrogens | |
| observable cholinomimetic effects | |
| OCG | oral cholecystogram |
| OCI | Obsessive-Compulsive Inventory |
| obliquus capitis inferior (neck muscle) | |
| OCL | oral colonic lavage |
| osteoclast(s) | |
| OCN | oculomotor nucleus |
| obsessive-compulsive neurosis | |
| Oncology Certified Nurse | |
| OCP | oral contraceptive pill |
| oral case presentation | |
| OCR | oculocephalic reflex |
| oxygen consumption rate | |
| oculocardiac reflex | |
| oculocerebrorenal | |
| outpatient cardiac rehabilitation | |
| OCS | oral contraceptives |
| open canalicular system | |
| Obsessive-Compulsive Scale | |
| obsessive-compulsive symptoms | |
| obstetric complications | |
| OCT | optical coherence tomography |
| Oral contraceptive therapy | |
| oxytocin challenge test | |
| oral cavity tumor | |
| OCU | observation care unit |
| OCVM | occult cerebrovascular malformations |
| OCX | oral cancer examination |
| occipital cortex | |
| OD | overdose |
| right eye | |
| Doctor of Optometry | |
| once daily | |
| ocular dominance | |
| on duty | |
| optic disc | |
| occupational disease | |
| ODA | on day of admission |
| Operating Department Assistant | |
| Orphan Drug Act | |
| ODC | oxygen dissociation curve |
| oxyhemoglobin dissociation | |
| outpatient diagnostic center | |
| ODD | Oppositional-Defiant Disorder |
| Once-daily dosing | |
| oculodentodigital | |
| ODE | optic disc edema |
| outer dental epithelium | |
| ODI | Oswestry Disability Index |
| oxygen desaturation index | |
| ODM | occlusion dose monitor |
| ODN | open donor nephrectomy |
| optokinetic nystagmus | |
| ODP | Ocular dominance plasticity |
| occipitodextra posterior | |
| offspring of diabetic parents | |
| ODQ | on direct questioning |
| Oswestry Disability Questionnaire | |
| ODS | Office of Dietary Supplements |
| osmotic demyelination syndrome | |
| Office of Drug Safety | |
| Oswestry Disability Score | |
| ODT | orally disintegrating tablet |
| optical Doppler tomography | |
| occipitodextra transerve | |
| OE | on examination |
| otitis externa | |
| open eyes | |
| orthopedic examination | |
| OEC | oxygen equilibrium curve |
| olfactory ensheathing cell | |
| outer ear canal | |
| OEI | opioid escalation index |
| Obesity Education Initiative | |
| Office of Evaluation and Inspections | |
| OEL | occupational exposure level/limits |
| OENT | oral endotracheal tube |
| OEP | olfactory evoked potentials |
| operational effectiveness program | |
| Office of Emergency Preparedness | |
| OER | oxygen extraction ratio |
| oxygen enhancement ratios | |
| oestrogen receptor | |
| OET | oral esophageal tube |
| open epicutaneous test | |
| oral endotracheal tube | |
| OF | opacity factor |
| occipital-frontal | |
| open field | |
| organ failure | |
| optic fundi | |
| osteitis fibrosa | |
| osteitis fibrosa | |
| OFC | occipitofrontal circumference |
| oral food challenge | |
| osteitis fibrosa cystica | |
| orofacial clefts | |
| OFG | orofacial granulomatosis |
| OFI | other febrile illness |
| ocular fixation index | |
| OFLOX | ofloxacin |
| OFM | open-face mask |
| oral focal mucinosis | |
| OFR | oxygen-free radicals |
| ocular following response(s) | |
| OFS | osteoplastic frontal sinusotomy |
| occasions for smoking scale | |
| organ failure score | |
| OFTT | organic failure to thrive |
| oral fat tolerance test | |
| OG | Obstetrics & Gynecology |
| oral glucose | |
| osmolality gap | |
| orogastric | |
| OGC | oculogyric crisis |
| oral glutamine challenge | |
| OGCT | oral glucose challenge test |
| ovarian germ cell tumor | |
| OGD | oesophagogastroduodenoscopy |
| oxygen and glucose deprivation | |
| OGIB | obscure gastrointestinal bleeding |
| OGNP | Obstetric-Gynecology Nurse Practitioner |
| OGT | orogastric tube |
| oral glucose tolerance | |
| OH | occupational health |
| occupational history | |
| obstetric history | |
| ocular history | |
| orthostatic hypotension | |
| ocular hypertension | |
| open-heart | |
| oral hypoglycemic | |
| oral hygiene | |
| OHA | oral hypoglycemic agents |
| OHC | outer hair cell |
| OHD | organic heart disease |
| OHF | old healed fracture |
| omsk hemorrhagic fever | |
| OHG | oral hypoglycemic |
| optico-hypothalamic gliomas | |
| OHI | oral hygiene instructions /index |
| OHL | oral hairy leukoplakia |
| occupational hearing loss | |
| OHP | oxygen at high pressure |
| orohypopharyngeal | |
| obese hypertensive patient | |
| OHS | obesity hypoventilation syndrome |
| occupational health service(s) | |
| Oslo Hypertension Study | |
| open heart surgery | |
| OHT | ocular hypertension |
| orthotopic heart transplantation | |
| orthostatic hypertension | |
| OI | opportunistic infection |
| oxygen index | |
| osteogenesis imperfecta | |
| otitis interna | |
| obesity index | |
| OIC | opioid-induced constipation |
| osteogenesis imperfecta congenita | |
| OIF | oil-immersion field |
| observed intrinsic frequency | |
| OIG | Office of the Inspector General |
| OIH | orthoiodohippurate |
| ovulation-inducing hormone | |
| OIM | Obturator internus muscle |
| optical immunoassay | |
| OINT | ointment |
| OIR | oxygen-induced retinopathy |
| OIS | ocular ischemic syndrome |
| opportunistic infections | |
| Office of Information Systems | |
| Organ Injury Scaling | |
| OIT | ovarian immature teratoma (rare ovarian cancer) |
| oral immunotherapy | |
| OJ | orange juice |
| obstructive jaundice | |
| OK | obstructed kidney |
| all right | |
| OKAN | optokinetic after nystagmus |
| OKC | odontogenic keratocyst |
| OKN | optokinetic nystagmus |
| OL | olfactory lobe |
| orbital layer | |
| open label | |
| optic lobes | |
| OLB | open-liver biopsy |
| open-lung biopsy | |
| olfactory bulb | |
| OLC | ouabain-like compound |
| osteoclast-like cell | |
| OLD | obstructive lung disease |
| OLE | occipital lobe epilepsy |
| OLF | olfactory |
| ouabain-like factor(s) | |
| OLM | ocular larva migrans |
| OLP | oral lichen planus |
| OLR | oral lichenoid reactions |
| OLS | ouabain-like substance |
| operating limits | |
| OLT | orthotopic liver transplant |
| OLV | one-lung ventilation |
| OLZ | olanzapine |
| OM | otitis media |
| ovulation method | |
| outer membrane | |
| obtuse marginal | |
| ocular movement | |
| oral motor | |
| osteomyelitis | |
| onychomycosis | |
| OMA | ocular motor apraxia |
| older maternal age | |
| OMAC | otitis media, acute, catarrhal |
| OMAS | Oral Mucositis Assessment Scale |
| otitis media, acute, suppurating | |
| OMB | obtuse marginal branch |
| OMC | open mitral commissuortomy |
| oculomotor complex | |
| OMD | organic mental disorder |
| ocular muscle dystrophy | |
| OME | otitis media with effusion |
| oral morphine equivalent | |
| Office of Medical Examiner | |
| OMG | ocular myasthenia gravis |
| OMI | old myocardial infarction |
| Oral Mucositis Index | |
| OMP | outer membrane protein |
| omeprazole | |
| oculomotor palsy | |
| OMR | Online Medical Record |
| operative mortality rate | |
| oculomotor range | |
| OMS | organic mental syndrome |
| opsoclonus-myoclonus syndrome | |
| oral morphine sulfate | |
| OMT | oral mucosal transudate |
| osteopathic manipulative treatment | |
| OMVC | open mitral valve commissurotomy |
| OMVD | optimized microvessel density |
| ON | optic nerve |
| optic neuritis | |
| over night | |
| ONB | olfactory neuroblastoma |
| ONC | Oncology |
| over-the-needle catheter | |
| Orthopedic Nurse, Certified | |
| OND | ondansetron |
| other neurological disorders | |
| optic nerve disease | |
| ONH | optic nerve head |
| optic nerve hypoplasia | |
| ONJ | osteonecrosis of the jaw |
| ONM | ocular neuromyotonia |
| ONSD | optic nerve sheath decompression |
| ONSF | optic nerve sheath fenestration |
| ONTD | open neural tube defect(s) |
| ONTR | orders not to resuscitate |
| OO | oophorectomy |
| ophthalmic ointment | |
| oral order | |
| orbicularis oculi | |
| OOB | out of bed |
| OOC | odontogenic cyst |
| onset of contractions | |
| out of cast | |
| Outlet obstructive constipation | |
| OOH | out of hospital |
| OOL | onset of labor |
| OOM | onset of menarche |
| oogonial metaphase | |
| OOP | out of pocket |
| out of pelvis | |
| OOR | orbicularis oculi reflex |
| out of room | |
| OOS | orbicularis oris superior |
| out of sequence | |
| OOW | out of wedlock |
| out of work | |
| OP | osmotic pressure |
| opening pressure | |
| outpatient | |
| oropharynx | |
| operation | |
| outpatient | |
| obese patient | |
| O&P | ova and parasites |
| OPA | oropharyngeal airway |
| OPAT | outpatient parenteral antibiotic therapy |
| OPB | outpatient basis |
| open brain | |
| OPC | Objective Performance Criteria |
| outpatient care | |
| Office of Primary Care | |
| oropharyngeal candidiasis | |
| OPD | outpatient department |
| obstructive pulmonary disease | |
| oropharyngeal dysphagia | |
| oculopharyngeal dystrophy | |
| OPE | outpatient evaluation |
| OPG | ocular plethysmography |
| opening | |
| oocysts per gram | |
| OPK | ovulation predictor kit |
| OPL | other party liability |
| oral premalignant lesion | |
| OPM | occult primary malignancy |
| OPN | operation |
| open partial nephrectomy | |
| OPO | organ procurement organizations |
| OPP | oppose |
| Organophosphate poisoning | |
| OPS | Objective Pain Scale |
| organophosphates | |
| optical position sensor | |
| OPT | Ovulation Predictor Test |
| outpatient | |
| optimum | |
| OPV | oral polio vaccine |
| outpatient visit | |
| OR | operating room |
| odds ratio | |
| open reduction | |
| ORD | optical rotatory dispersion |
| orderly | |
| ORL | Otorhinolaryngology |
| oblique retinacular ligament | |
| ORN | operating room nurse |
| OROS | oral osmotic |
| ORP | operating room personnel |
| oxidation-reduction potentials | |
| occiput right posterior | |
| ORR | overall response rate |
| objective response rate | |
| ORS | olfactory reference syndrome |
| oral rehydration solution | |
| oculo-respiratory syndrome | |
| ORT | operating room technician |
| oral rehydration therapy | |
| OS | left eye |
| overall survival | |
| open surgery | |
| oral surgery | |
| occupational safety | |
| OSA | obstructive sleep apnea |
| osteosarcoma | |
| OSC | open sigmoid colectomy |
| oral self-care | |
| OSD | Osgood-Schlatter disease |
| occupational skin disease | |
| OSE | ovarian surface epithelium |
| OSM | osmolarity |
| OSN | olfactory sensory neuron |
| off-service note | |
| OSP | Oligodendrocyte-specific protein |
| Oral Sodium Phosphate | |
| OSR | open surgical repair |
| overall survival rate | |
| OSS | osseous |
| OST | out-of-school-time |
| Ottawa Stroke Trial | |
| Oligosaccharyltransferase | |
| overall survival time | |
| OT | objective test |
| Occupational Therapist | |
| occupational therapy | |
| occlusion time | |
| office therapy | |
| OTA | occupational therapy assistant |
| open to air | |
| OTC | over-the-counter |
| off the case | |
| OTD | optimal therapeutic dose |
| oral temperature device | |
| OTE | optically transparent electrode |
| Overall Treatment Evaluation | |
| OTO | otology |
| one-time only | |
| OT/RT | occupational therapy/recreational therapy |
| OTS | optical tracking system |
| orotracheal suction | |
| oxygen transport system | |
| OTT | oral transit time |
| overall treatment time | |
| oesophageal transit time | |
| OTW | over the wire |
| OU | both eyes / each eye |
| OUES | oxygen uptake efficiency slope |
| OULQ | outer upper left quadrant |
| OURQ | outer upper right quadrant |
| OUS | obstetric ultrasound |
| observation units | |
| OV | office visit |
| ovulation | |
| osteoid volume | |
| OVCA | ovarian cancer |
| OVD | occlusal vertical dimension |
| ophthalmic viscoelastic device | |
| OVLT | organum vasculosum of lamina terminalis |
| OVR | Office of Vocational Rehabilitation |
| oculovestibular reflex | |
| OVS | overall survival |
| obstructive voiding symptoms | |
| OW | once weekly |
| open wound | |
| oval window | |
| overweight | |
| OX | oxalate |
| oxide | |
| oximeter | |
| OXA | oxacillin |
| oxaplatin | |
| OXC | oxcarbazepine |
| OXT | oxytocin |
| OZ | ounce |
| optical zone | |
