Other Abbreviationsa = before (ante) ABG = arterial blood gas ABT = antibiotic therapy ac = before meals (ante cibum) AD = right ear (auricula dexter) ADH = antidiuretic hormone ad lib = as desired ADA = American Diabetes Ass. am = before noon (ante meridian) AMA = against medical advice aq = water AS = left ear (auricula sinister) AU = both ears (auriculi utro) bid = twice a day (0900, 1700) BP = blood pressure BUN = blood urine nitrogen c = with cap = capsule CAD = coronary artery disease CAT = computerized axial tomography CBC = complete blod count CF = cystic fibrosis CHF = congestive heart failure CNS = central nervous system CO = cardiac output COPD = chronic obstructive pulmonary disease CPK = creatinine phosphokinase CSF = cerebrospinal fluid CVA = cerebrovascular accident CVP = central venous pressure EC = enteric coated ECG = electrocardiogram EEG = electroencephalogram elix = elixir ext = extract GFR glomerulofiltration rate GT = gastrostomy h = hour hct = hematocrit hgb = hemoglobin hs = hour of sleep, bedtime (2100) ID = intradermal ICP = intracranial pressure IM = intramuscular IV = intravenous IVP = intravenous push/pyelogram IVPB = intravenous piggyback KVO = keep vein open MI = myocardial infarction NG = nasogastric NJ = nasojejunal NPO = nothing by mouth NS = normal saline OD = right eye (oculus dexter) oint = ointment OTC = over the counter OS = left eye (oculus sinister) OU = both eyes (oculo utro) p = after (post) pc = after meals (post cibum) per = by pm = after noon (post meridian) po = by mouth (per os) pr = per rectal prn = whenever necessary PT = prothrombin time PTT = partial prothrombin time q = every q1h = every 1 hour q2h = every 2 hours q3h = every 3 hours q4h = every 4 hours (0900, 1300, 1700,...0500) q6h = every 6 hours (2400, 0600, 1200, 1800) q8h = every 8 hours (0600, 1400, 2200) qd = every day (0900) qh = every hour qid = four times a day (0900, 1300, 1700, 2100) qod = every other day qs = quantity sufficient RBC = red blood count ROM = range of motion s = without sc = subcutaneous sl = sublingual sol = solution sq = subcutaneous SR = sustained release ss = one half S/S = signs and symptoms stat = immediately supp = suppository susp = suspension syr = syrup tab = tablet tid = three times a day (0900, 1300, 1700) TO = telephone order tr = tincture ung = ointment UTI = urinary tract infection VO = verbal order VS = vital signs WBC = white blood count WNL = within normal limits