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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 | |