Abbreviations and Symbols • APPENDIX E 617ContinuedO
O 2 oxygen
OB obstetrics
OCP oral contraceptive pill
O.D. Doctor of Optometry
OD overdose
OD* right eye
OM otitis media
OP outpatient; operative procedure
OR operating room
ORTH, ortho orthopedics
OS* left eye; by mouth (pharmacology)
OSA obstructive sleep apnea
OU* both eyes
P
P phosphorus; pulse
PA posteroanterior; pernicious
anemia; pulmonary artery;
physician assistant
PAC premature atrial contraction
Pap Papanicolaou (test)
para 1, 2, 3, and unipara, bipara, tripara, and so on
so on (number of viable births)
PAT paroxysmal atrial tachycardia
PBI protein-bound iodine
pc, p.c.* after meals
PCL posterior cruciate ligament
PCNL percutaneous nephrolithotomy
PCO 2 partial pressure of carbon
dioxide
PCP Pneumocystis pneumonia; primary
care physician
PE physical examination; pulmonary
embolism; pressure-equalizing
(tube)
PERRLA pupils equal, round, and reactive
to light and accommodation
PET positron emission tomography
PFT pulmonary function test
PGH pituitary growth hormone
pH symbol for degree of acidity or
alkalinity
PID pelvic inflammatory diseaseMCHC mean cell hemoglobin concentration
(average concentration of
hemoglobin per red cell)
MCV mean cell volume (average volume
or size per red cell)
MDI metered-dose inhaler
MEG magnetoencephalography
MG myasthenia gravis
mg milligram (1/1,000 of a gram)
mg/dl, mg/dL milligram per deciliter
MI myocardial infarction
mix astig mixed astigmatism
ml, mL milliliter (1/1,000 of a liter)
mm millimeter (1/1,000 of a meter)
mm Hg millimeters of mercury
MR mitral regurgitation
MRA magnetic resonance angiogram;
magnetic resonance angiography
MRI magnetic resonance imaging
MS mitral stenosis; musculoskeletal;
multiple sclerosis; mental
status; magnesium sulfate
MSH melanocyte-stimulating hormone
MUGA multiple-gated acquisition (scan)
MVP mitral valve prolapse
MVR mitral valve replacement; massive
vitreous retraction (blade);
microvitreoretinal
Myop myopia (nearsightedness)
N
Na sodium (an electrolyte)
NB newborn
NCV nerve conduction velocity
NG nasogastric
NIDDM non–insulin-dependent diabetes
mellitus
NIHL noise-induced hearing loss
NK natural killer cell
NMT nebulized mist treatment
NPO, n.p.o.* nothing by mouth
NSAID nonsteroidal anti-inflammatory
drug
NSR normal sinus rhythmAbbreviation Meaning Abbreviation Meaning3971_App E_613-621 13/02/14 11:26 AM Page 617