Dictionary of Medical Acronyms & Abbreviations

[ O ]

• OL  open label(ed)
• ol  left eye [Lat. oculus laevus]
• OLA  left occipitoanterior [fetal position, Lat. occipito-laeva anterior]; oligonucleotide ligation assay
• OLAP  online analytical processing
• OLAS  oligoisoadenylate synthetase
• OLB  olfactory bulb; open liver biopsy; open lung biopsy
• OLBx  open lung biopsy
• OLC  ouabain-like compound
• OLD  obstructive lung disease; orthochromatic leukodystrophy
• OLDMEDLINE  Old MEDLARS Online [NLM database of 1960-1965 citations]
• OLE  object linking and embedding
• olf  olfactory
• OLFR  olfactory receptor
• OLH  ovine lactogenic hormone
• oLH  ovine luteinizing hormone
• OLI  octree level index
• OLIDS  open loop insulin delivery system
• OLIV  Olifantsvlei virus
• OLMC  online medical control
• OLP  left occipitoposterior [fetal position, Lat. occipito-laeva posterior]
• OLR  otology, laryngology, and rhinology
• ol res  oleoresin
• OLRx  orthotopic liver transplantation
• OLS  ordinary least square; ouabain-like substance
• OLT  left occipitotransverse [fetal position]; orthotopic liver transplantation
• OLVV  Oliveros virus
• OM  obtuse marginal [artery]; obtuse mental; occipitomental; occupational medicine; ocular movement; oculomotor; operations manager [database]; Osborne Mendel [rat]; osteomalacia; osteomyelitis; osteopathic manipulation; otitis media; outer membrane; ovulation method
• OMA  object management architecture
• OMAC  otitis media, acute catarrhal
• OMAS  occupational maladjustment syndrome
• OMB  obtuse marginal branch; Office of Management and Budget
• OMC  office of managed care; orientation-memory-concentration [test]
• OMCH  Office of Maternal and Child Health
• OMCT  Orientation-Memory-Concentration Test
• OMD  ocular muscle dystrophy; oculomandibulodyscephaly; orbital maxillary disjunction; organic mental disorder; oromandibular dystonia
• OMDB  object microdatabase
• OME  office of medical examiner; otitis media with effusions
• OMEGA  Ottawa-Madison electron gamma algorithm
• Ω  Greek capital letter omega; ohm
• ω  Greek lowercase letter omega; angular velocity
• OMERACT  Outcome Measures in Rheumatoid Arthritis Clinical Trial
• OMFAQ  older Americans resources and services (OARS) multidimensional functional assessment questionnaire
• OMG  object management group; oligodendrocyte-myelin glycoprotein; osteopathic medical school graduate
• OMGE  Organisation Mondiale de Gastro-Enterologie
• OMGP  oligodendrocyte-myelin glycoprotein
• OMH  Office of Mental Health
• OMI  office of medical investigator; old myocardial infarction
• OMIA  Online Mendelian Inheritance in Animals [database]
• ο  Greek letter omicron
• OMIM  Online Mendelian Inheritance in Man [database]
• OML  orbitomental line
• OMN  oculomotor nerve
• OMNI  Organizing Medical Networked Information [UK]
• OMOV  Omo virus
• OMP  olfactory marker protein; oligonucleoside methylphosphonate; ornithine monophosphate; orotidine-5´-monophosphatase; outer membrane protein
• OMPA  octamethyl pyrophosphoramide; otitis media, purulent, acute
• OmpA, ompA  outer membrane protein A
• OMPC, OMPCh  otitis media, purulent, chronic
• OmpF, ompF  outer membrane protein F
• OMR  oligomycin-resistant; online medical record
• OMRT  Ontario Association of Medical Radiation Technologists
• OMS  occupational medical services; organic mental syndrome; otomandibular syndrome
• OM&S  osteopathic medicine and surgery
• OMSA  otitis media, suppurative, acute
• OMSC  otitis media secretory (or suppurative) chronic
• OMT  object modeling technique; ocular microtremor; O-methyltransferase; ophthalmic medical technician or technologist; osteopathic manipulative therapy
• OMV  outer membrane vesicle
• OMVC  open mitral valve commissurotomy
• ON  occipitonuchal; office nurse; olfactory nucleus; onlay; optic nerve; orthopedic nurse; osteonecrosis; osteonectin; overnight
• ONAC  Office of Noise Abatement and Control
• ONC  oncogene; oncology; open network communication; Orthopaedic Nursing Certificate; over-the-needle catheter
• OND  Ophthalmic Nursing Diploma; orbitonasal dislocation; other neurological disorders
• ONE  [computer-assisted] otoneurological expert system
• ONG  optic nerve glioma
• ONMRS  onychotrichodysplasia-neutropenia-mental retardation syndrome
• ONNV  o'nyong-nyong virus
• ONP  operating nursing procedure; orthonitrophenyl
• ONPG  o-nitrophenyl-beta-D-galactopyranoside
• ONS  Oncology Nursing Society
• ONSA  Organization for Nucleotide Sequencing and Analysis
• ONTG  oral nitroglycerin
• ONTR  orders not to resuscitate
• OO  object-oriented; oophorectomy; orbicularis oculi [muscle]
• O&O  on and off
• OOA  object-oriented analysis; outer optic anlage
• OOB  out of bed
• OODB  object-oriented database
• OODBMS  object-oriented database management system
• OOG  optic oculography
• OOH  out-of-hospital
• OOH/CA  out-of-hospital cardiac arrest
• OOHRT  object-oriented health care terminology respository
• OOLR  ophthalmology, otology, laryngology, and rhinology
• OOM, oom  oogonial metaphase
• OOMM  object-oriented matrix model
• OOP  object-oriented programming
• OOR  out-of-room
• OORR  orbicularis oculi reflex response
• OOSE  object-oriented software engineering
• OOSS  Outpatient Ophthalmic Surgery Society
• OOW  out of wedlock
• OOWS  objective opiate withdrawal scale
• OP  occipitoparietal; occipitoposterior; occiput posterior; octapeptide; olfactory peduncle; opening pressure; operation, operative; operative procedure; ophthalmology; opponens pollicis; optic neuritis; organophosphate; oropharynx; orthostatic proteinuria; osmotic pressure; osteoporosis; outpatient; ovine prolactin
• O&P  ova and parasites
• O/P  outpatient
• Op  ophthalmology; opisthocranion
• op  operation; operator
• OPA  oligonucleoside phosphoramidate; open procurement agency; optic atrophy; organ procurement agency; oropharyngeal airway; outcome and process assessment
• OPALS  Ontario Prehospital Advanced Life Support [study]
• op-amp  operational amplifier
• OPB  outpatient basis
• OPC  oculopalatocerebral [syndrome]; oligonucleotide purification cartridge; outpatient clinic; overall performance category
• OPCA  olivopontocerebellar atrophy
• OPCAB  off-pump coronary artery bypass
• OPCD  olivopontocerebellar degeneration
• OPCOS  oligomenorrheic polycystic ovary syndrome
• OPCRIT  operational criteria
• OPCS  Office of Population Censuses and Surveys [UK]
• OPD  obstetric prediabetic; optical path difference; otopalatodigital [syndrome]; outpatient department; outpatient dispensary; o-phenylenediamine
• o-PDA  o-phenylenediamine
• O´p-DDD  mitotane
• OpDent  operative dentistry
• OPDG  ocular plethysmodynamography
• OPDS  otopalatodigital syndrome
• OPF  oligo[poly(ethylene glycol) fumarate]
• OPG  ocular pneumoplethysmography; orthopantomogram; oxypolygelatin
• opg  opening
• OPH  obliterative pulmonary hypertension; ophthalmia; organic phosphate
• OPH, Oph  ophthalmology; ophthalmoscopy, ophthalmoscope
• Oph A  ophthalmic artery
• OPHC  Office of Prepaid Health Care
• OphD  Doctor of Ophthalmology
• OPHS  Office of Public Health and Science
• Ophth  ophthalmology
• OPI  oculoparalytic illusion; Omnibus Personality Inventory
• OPIDN  organophosphate-induced delayed neuropathy
• OPIDP  organophosphate-induced delayed polyneuropathy
• OPIM  other potentially infectious material
• OPK  object processing kernal; optokinetic
• OPL  other party liability; outer plexiform layer; ovine placental lactogen
• OPLINK  Ohio Public Library Information Network
• OPLL  ossification of posterior longitudinal ligament
• OPM  occult primary malignancy; Office of Personnel Management; ophthalmoplegic migraine
• OPMD  oculopharyngeal muscular dystrophy
• OPMSS  Olestra Postmarketing Surveillance Study
• OPN  ophthalmic nurse; osteopontin
• OPO  Organ Procurement Organization
• OPP  osmotic pressure of plasma; oxygen partial pressure
• opp  opposite
• OPPA  vincristine, procarbazine, prednisone, Adriamycin
• OPPG  oculopneumoplethysmography
• OPRD  opiate receptor delta
• OPRK  opiate receptor kappa
• OPRR  Office for Protection from Research Risks
• OPPS  outpatient prospective payment system
• OPRT  orotate phosphoribosyltransferase
• OPRTase  orotate phosphoribosyltransferase
• OPS  operations; optical position sensor; optimal parameter search [algorithm]; osteoporosis-pseudolipoma syndrome; outpatient service; outpatient surgery
• OPSA  ovarian papillary serous adenocarcinoma
• OpScan  optical scanning
• OPSEC  operations security
• OPSI  overwhelming postsplenectomy infection
• OPSR  Office of Professional Standards Review
• OPT  oligonucleoside phosphorothioate; o-phthaldialdehyde; optimization [method]; outpatient; outpatient treatment
• opt  best [Lat. optimus]; optics, optician
• OPTHD  optimal hemodialysis
• OPTICUS  Optimization with Intracoronary Ultrasound to Reduce Stent Restenosis [trial]
• OPTIMAAL  Optimal Trial in Myocardial Infarction with Angiotensin II Antagonist Losartan
• OPTIME  Outcomes of a Prospective Trial of Intravenous Milrinone for Exacerbations [of chronic heart failure]
• OPTIME CHF  Outcomes of a Prospective Trial of Intravenous Milrinone for Exacerbations of Chronic HeartFailure
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