O&E, observation and examination
O&P, ova and parasite
O.&A., odontectomy and alveolectomy
O/E, on examination.
O:, objective.
O’p-DDD, mitotane.
O2, oxygen
OA, occiput posterior.
OA, osteoarthritis.
OAP, osteoarthropathy.
OARG, Osteoporosis and Arthritis Research Group.
OARS, Osteoarthritis Research Society.
OATA, Ohio Athletic Trainers Association.
OATS, osteochondral autograft transfer system.
OB, obstetrics.
OB/OJ ratio, overbite (OB) and horizontal overjet (OJ) ratio.
Ob-GYN, obstetrics and gynecology.
OBJ, object; objective.
OBL, oblique.
OBP, ova, blood and parasites.
OBS, observer.
OBS, obstetrics.
OBS, organic brain syndrome.
OC, obsessive/compulsive.
OC, on call
OC, oral contraceptive; office call.
OCC, occasionally.
OCC, occiput.
OCC, occupation.
OCD, obsessive-compulsive disorder.
OCD, osteochrondritis dissecans.
OCE, comprehensive exam.
OCE, observable cholinomimetic effects.
OCE, odd-carbon fatty acid enriched.
oCE, oligomeric carboxylesterases.
OCE, oral conjugated estrogens.
OCE, osteocartilaginous exostoses.
OCEs, Oct-containing composite elements.
OCF, occipital-frontal circumference.
OCG, oral cholecystogram.
OCP, oral contraceptive pills.
OCS, open canalicular system (about platelets).
OD, (oculus dexter) right eye.
OD, occupational disease.
OD, officer of the day.
OD, once daily.
OD, optic density.
OD, outer diameter.
OD, overdose.
ODA, on day of admission.
ODN, oligodeoxynucleotide.
ODS, Oswestry Disability Score.
OE, on examination; orthopedic examination; otitis externa
OECI, Organization of European Cancer Institutes.
OES, old English sheepdog.
OFFA, Orthopaedic Foundation for Animals.
OGE, U.S.Office of Government Ethics.
OGTT, oral glucose tolerance test.
OH, occupational history.
OHCS(17-), 17-hydroxcorticosteroids.
OHS, open heart surgery.
OIA, optical immunoassay.
OIF, Osteogenesis Imperfecta Foundation.
Oint, ointment.
OJ, isoleucyl-tRNA synthetase.
OJ, obstructive jaundice.
OJ, orange juice.
OJ, Orthodontist Judgment.
OJ, overjet (type of maloclusion).
OL, open label.
OLSNA, Orthopaedic Laser Society of North America.
OM, obtuse marginal artery.
OM, occupational medicine.
OM, osteopathic manipulation.
OM, otitis media.
OMCTS, octamethylcyclotetrasiloxane.
OMS, osteomyelosclerosis.
ON, optic neuritis.
ONC, oncology.
ONDCP, Office of National Drug Control Policy.
ONFH, osteonecrosis of the femoral head.
OO, osteoid osteoma.
OOB, out of bed.
OOH, out of hospital.
OOP, out of plaster.
OP, occiput posterior.
OP, operation.
OP, opponens pollicis.
OP, out patient.
OPC, oculopalatocerebral (syndrome).
OPC, outpatient clinic.
OPCA, olivopontocerebellar atrophy.
OPCD, olivopontocerebellar degeneration.
OPCOS, oligomenorrheic polycystic ovary syndrome.
OPD, obstetric prediabetic.
OPD, optical path difference.
OPD, otopalatodigital (syndrome).
OPD, outpatient department.
OPD, outpatient dispensary.
OPD, p-phetiylenediamine.
OpDent, operative dentistry.
OPDG, ocular plethysmodynamography.
OPG, ocular pneumoplethysmography.
opg, opening.
OPG, orthopantomograin.
OPG, osteoprotegerin.
OPG, oxypolygelatin.
OPH, obliterative pulmonary hypertension; ophthalmia.
OPH, Oph ophthalmology; ophthalmoscopy, ophthalmoscope.
OPHC, Office of Prepaid Health Care.
OphD, Doctor of Ophthalmology.
Ophth, ophthalmology.
OPI, obliteration prediction index.
OPI, oculoparalytic illusion; Omnibus Personality Inventory.
OPI, opiates.
OPI, osteoblastic proliferation index.
OPI, overproduction inhibition.
OPIDN, organophosphorus-induced delayed neuropathy.
OPK, optokinetic.
OPL, other party liability; outer plexiform layer; ovine placental lactogen.
OPLL, ossification of posterior longitudinal ligament.
OPM, occult primary malignancy; Office of Personnel Management; ophthalmoplegic migraine.
OPN, ophthalmic nurse; osteopontin.
OPO, Organ Procurement Organization.
opp, opposite.
OPP, opposite.
OPP, osmotic pressure of plasma; oxygen partial pressure.
OPPA, vincristine, procarbazine, prednisone, Adriamycin.
OPPG, oculopneumoplethysmography.
OPRD, opiate receptor delta.
OPRK, opiate receptor kappa.
OPRR, Office of Protection from Research Risks.
OPRT, orotate.. pbosphoribosyltransferase.
OPRTase, orotate phosphoribosyltransferase.
OPS, operations; optical position sensor; osteoporosis-pseudolipoma syndrome; outpatient service; outpatient surgery.
OPSA, ovarian papillary serous adenocarcinoma.
OpScan, optical scanning.
OPSI, overwhelming postsplenectomy infection.
OPSR, Office of Professional Standards Review.
opt, best (Lat. Optimus); optics, optician.
OPT, outpatient treatment.
OPT, outpatient; outpatient treatment.
OPTHD, optimal hemodialysis.
OPV, oral polio vaccine.
OPV, oral poliovirus vaccine.
OPWL, opiate withdrawal.
OR&F, open reduction and fixation; open reading frame.
OR, (o)estrogen receptor; odds ratio; oil retention (enema]; open reduction; operating room; optic radiation; oral rehydration; orosomucoid; orthopedic; orthopedic research.
OR, open reduction.
OR, operating room.
Or, orbitale.
OR, oriented.
O-R, oxidation-reduction.
OR, rate of outflow.
ORA, opiate receptor agonist.
ORA, Orthopaedic Rehabilitation Association (AAOS Specialty Societies).
ORALABX, oral antibiotics.
ORANS, Oak Ridge Analytical System.
ORBC, ox red blood cell.
ORBD-NRC, Osteoporosis and Related Bone Diseases - National Resource Center.
ORC, oculo-reno-cerebellar [syndrome].
Orcb, orchitis.
ORD, optical rotatory dispersion; oral radiation death.
ORDS, Office of Research, Demonstration, and Statistics.
ORE, oil retention enema.
OREF, Orthopaedic Research and Education Foundation.
ORF, open reading frame.
ORF, open reading frames.
Org, org, organic.
ORIF, open reduction with internal fixation (sample operative report).
OrJ, orange juice.
ORJF, open reduction jaw fracture.
ORL, otorhinolaryngology.
ORM, orosomucoid; other regulated material; oxygen ratio monitor.
ORMC, oxygen ratio monitor controller.
ORN, operating room nurse; orthopedic nurse.
Orn, ornithine.
ORNL, Oak Ridge National Laboratoiy.
ORO, oil red 0.
OROS, oral osmotic.
ORP, operating room personnel.
ORP, oxidation-reduction potential.
ORPM, orthorhythniic pacemaker.
ORS, olfactory reference syndrome.
ORS, oral rehydration solution.
ORS, oral surgery, oral surgeon.
ORS, Orthopaedic Research Society (also: AAOS Specialty Societies).
ORS, orthopedic surgeon, orthopedic surgery.
ORS, oxygen radical scavengers.
ORSA, osteoclast resorption stimulating activity.
ORS-ROC, Orthopedic Research Society, Republic of China.
ORT, object relations technique; operating room technician; oral rehydration therapy.
ORT, operating room technician.
orth, ortho orthopedics, orthopedic.
Ortho, ORTH, orthopedics.
ORV, Orthopaedic Research of Virginia.
ORW, Osler-Rendu-Weber (syndrome).
OS, (oculus sinister) left eye.
OS, bone.
Os, occipitosacral.
Os, occupational safety.
Os, office surgery.
Os, Omenn syndrome.
Os, opening snap.
Os, operating system.
Os, oral surgery.
OS, oral surgery.
Os, organ specific.
OS, oris, mouth or other opening.
Os, orthopedic surgeon, orthopedic surgery.
Os, Osgood-Schlatter [disease].
Os, osmium.
OS, osteogenic sarcoma (context bone tumors).
Os, osteogenic sarcoma.
Os, osteosarcoma.
Os, osteosclerosis.
Os, oubain sensitivity.
Os, overall survival.
OS, overall survival.
Os, oxygen saturation.
OS, ozone safe.
OSA, obstructive sleep apnea.
OSA, Office of Services to the Aging.
OSA, Optical Society of America.
OSA, ovarian sectional area.
OSAE, Orthopaedic Special Assessment Examination (for AAOS members: Medical Education Section).
OSAS, obstructive sleep apnea syndrome.
osc, oscillation.
OSCAR, on-line survey, certification and reporting system.
OSCC, oral squamous cell carcinoma.
OSCE, objective structured clinical examination.
OSF, organ system failure; osteoclast-stimulating factor; outer spiral fiber; overgrowth stimulating factor.
OSH, Act Occupational Safety and Health Act of 1970.
OSHA, Occupational Safety and Health Adminstration.
OSI, open systems interconnection [reference model].
osm, osmole; osmosis, osmotic.
OSM, ovine submaxillary mucin; oxygen saturation meter.
Osm/kg, osmoles per kilogram.
Osm/l, osmoles per liter.
OSMED, otospondylometaphyseal dysplasia.
osmol, osmole.
OSR, oilseed rape.
OSRD, Office of Scientific Research and Development.
oss, osseous.
OSS, over-the-shoulder strap.
OST, object sorting test; Office of Science and Technology.
osteo, osteoarthritis; osteomyelitis; osteopathy.
OSTOP, Osteoporosis Society of British Columbia.
OSUK, Ophthalmological Society of the United Kingdom.
OSV, Orbis Sigma Valves Type I.
OT, objective test; oblique talus; occlusion time; occupational therapist, occupational therapy; ocular tension; office therapy; old term (in anatomy).
OT, objective test; occupational therapy.
OT, occupational therapy, old tuberculin.
OT, old tuberculin (Koch's old tuberculin) or Koch's original tuberculin.
OT, olfactory threshold; optic tract; orientation test ; original tuberculin; ornithine transcarbamylase; orotracheal; orthopedic treatment; otolaryngology; otology; oxytocin; oxytryptamine.
Ot, otolaryngology.
OTA, occupational therapy assistant.
OTA, Office of Technology Assessment.
OTA, ornithine transaminase.
OTA, Orthopaedic Trauma Association (Newsletter) (also: AAOS Specialty Societies).
OTA, orthotoluidine arsenite.
OTC, over the counter (a drug that can be obtained without a prescription).
OTM, os tibiale mediale.
Oto, otology.
OTRPC, osm TRPC.
OU, (oculus uterqie) each eye.
OV, office visit.
OWL, Orthopaedic Web Links.
OXT, oxytocin.
oz, ounce.
2PD, two point discrimination.
6-PGD, 6-phosphogluconate dehydrogenase.
P&A, percussion and auscultation
P&S, permanent and stationary
P(a-ET)CO2, arterial-end tidal PCO2 difference (should be less than 7 mmHg).
p(with line over it), after, post.
p, pathological.
P, periarteriolar lymphocyte sheath (about spleen).
P, phosphorus, pressure, pulse, para.
P, product.
P, proline.
p.r.n., pro re nata (as needed).
P:, plan.
P02, pressure of oxygen
p24, viral protein specific to HIV virus.
p53, a tumor suppressor gene.
PA(S)P, pulmonary artery (systolic) pressure.
PA, pernicious anemia.
PA, phagocytic activity.
PA, physician assistant.
PA, polyactive.
PA, posteroanterior (view in X-rays).
PA, pulmonary artery.
PAB, PBS/bovine serum albumin/azide buffer.
PAC, porous apatite ceramics.
PAC, premature atrial contraction.
PACAP, Pituitary adenylate-cyclase-activating polypeptide.
PaCO2 (kPa), carbon dioxyde partial pressure in arterial blood.
PaCO2, partial pressure of carbon dioxide in arterial blood.
PACU, post anesthesia care unit.
PAD, palmar adductors.
PAD, peripheral arterial disease.
PAD, peripheral arteriosclerotic disease.
PAD, preliminary anatomic diagnosis.
PADP, pulmonary artery diastolic pressure.
PAEDP, pulmonary artery end-diastolic pressure (normal range 4-13 mmHg).
PAF, platelet-activating factor.
PAHO, Pan American Health Organization.
PAI, physical activity index.
PAL, posterior axillary line.
PALS, pediatric advanced life support (training course).
PALS, periarteriolar lymphocyte sheath.
PAM, Potential Acuity Meter.
PAN, polyarteritis nodosa.
p-ANCA, perinuclear antineutrophil cytoplasmic antibodies.
PAO, periarticular ossification.
PaO2, partial pressure of oxygen in arterial blood.
PAOD, peripheral arterial occlusive disease.
PAOP, pulmonary artery occluded pressure.
PAOP, pulmonary artery occlusive pressure (a.k.a.PCWP).
Pap, Papanicolaou smear.
PAP, peroxidase antiperoxidase.
PAP, prostatic acid phosphatase.
PAP, pulmonary artery pressure (normal mean 9-19 mmHg) .
para, number of pregnancies.
pares., paresthesias.
PARP, poly (ADP-ribose) polymerase.
PARQ, Parent-Adolescent Relationship Questionnaire.
PARQ, Parental Acceptance/Rejection Questionnaire.
PARQ, Physical Activity Readiness Questionnaire.
PARQ, physical activity recall questionnaire.
PASG, pneumatic anti-shock garment.
PASI, psoriasis area and severity index (scoring of erythema, induration, scaling and involved area).
PAT, paroxysmal atrial tachycardia.
Path, pathology.
PB, phenobarbital.
PBB, polybrominated biphenyls (intoxication cause disorders of immune function).
PBC, primary biliary cirrhosis.
PBD, Pick body dementia.
PBI, protein bound iodine.
PBL, primary brain lymphoma.
PBL, problem-based learning.
PBMC, peripheral blood mononuclear cells.
PBN, phenyl-N-tert-butyl nitrone.
pBNP, porcine brain natriuretic peptide.
PBO, placebo.
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