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Lexicomp clinical abbreviations and age group definitions

Lexicomp clinical abbreviations and age group definitions

NOTE: Age group definitions used in Lexicomp are provided at the end of this table.

Country code definitions used in the "Brand Names: International" field of Lexicomp are provided in a separate table available in the international brand names field of each monograph.
Abbreviation Meaning Abbreviation Meaning Abbreviation Meaning
Abbreviations, acronyms, and symbols that may be used in Lexicomp*
½NS 0.45% sodium chloride EEG Electroencephalogram NSF Nephrogenic systemic fibrosis
5-HT 5-hydroxytryptamine (serotonin) EF Ejection fraction NSCLC Non-small cell lung cancer
AACT American Academy of Clinical Toxicology EG Ethylene glycol NSTEMI Non-ST-elevation myocardial infarction
AAP American Academy of Pediatrics EGA Estimated gestational age NYHA New York Heart Association
AAPC Antibiotic-associated pseudomembranous colitis EIA Enzyme immunoassay OA Osteoarthritis
ABCB1 ATP-binding cassette sub-family B member 1 (also known as P-gP or MDR1) ELBW Extremely low birth weight OAT Organic anion transporter
ABCC2 ATP-binding cassette sub-family C member 2 (also known as MRP2) ELISA Enzyme-linked immunosorbent assay OCD Obsessive-compulsive disorder
ABCG2 ATP-binding cassette sub-family G member 2 (also known as BCRP) EPS Extrapyramidal side effects OCT Organic cation transporter
ABG Arterial blood gases ESR Erythrocyte sedimentation rate OHSS Ovarian hyperstimulation syndrome
ABMT Autologous bone marrow transplant ESRD End stage renal disease O.R. Operating room
ABW Actual body weight E.T. Endotracheal OTC Over-the-counter (nonprescription)
ACC American College of Cardiology EtOH Alcohol PABA Para-aminobenzoic acid
ACE Angiotensin-converting enzyme FDA Food and Drug Administration (United States) PACTG Pediatric AIDS Clinical Trials Group
ACLS Advanced cardiac life support FEV1 Forced expiratory volume exhaled after 1 second PALS Pediatric advanced life support
ACOG American College of Obstetricians and Gynecologists FMO Flavin-containing monooxygenase PAT Paroxysmal atrial tachycardia
ACT Activated clotting time FSH Follicle-stimulating hormone PCA Patient-controlled analgesia
ACTH Adrenocorticotrophic hormone FTT Failure to thrive PCI Percutaneous coronary intervention
ADAMTS13 activity A Disintegrin And Metalloprotease with a ThromboSpondin type 1 motif, member 13 activity FVC Forced vital capacity PCP Pneumocystis jiroveci pneumonia (also called Pneumocystis carinii pneumonia)
ADH Antidiuretic hormone G-6-PD, G6PD Glucose-6-phosphate dehydrogenase PCWP Pulmonary capillary wedge pressure
ADHD Attention-deficit/hyperactivity disorder GA Gestational age PD Parkinson's disease; peritoneal dialysis
ADI Adequate daily intake GABA Gamma-aminobutyric acid PDA Patent ductus arteriosus
AdjBW Adjusted body weight GAD Generalized anxiety disorder PDE-5 Phosphodiesterase-5
ADLs Activities of daily living GE Gastroesophageal PE Pulmonary embolism
ADT Androgen deprivation therapy GERD Gastroesophageal reflux disease PEG tube Percutaneous endoscopic gastrostomy tube
AED Antiepileptic drug GFR Glomerular filtration rate P-gP P-glycoprotein
AHA American Heart Association GGT Gamma-glutamyltransferase PHN Post-herpetic neuralgia
AHCPR Agency for Health Care Policy and Research GI Gastrointestinal PICU Pediatric Intensive Care Unit
AIDS Acquired immunodeficiency syndrome GIST Gastrointestinal stromal tumor PID Pelvic inflammatory disease
AIMS Abnormal Involuntary Movement Scale GU Genitourinary PIP Peak inspiratory pressure
ALK Anaplastic lymphoma kinase GVHD Graft versus host disease PIRRT Prolonged intermittent renal replacement therapy
ALL Acute lymphoblastic leukemia HAM-A Hamilton Anxiety Scale PMA Postmenstrual age
ALS Amyotrophic lateral sclerosis HAM-D Hamilton Depression Scale PMDD Premenstrual dysphoric disorder
ALT Alanine aminotransferase (formerly called SGPT) HARS HIV-associated adipose redistribution PNA Postnatal age
AMA American Medical Association Hb Hemoglobin PONV Postoperative nausea and vomiting
AML Acute myeloblastic leukemia HCAHPS Hospital Consumer Assessment of Healthcare Providers and Systems PPHN Persistent pulmonary hypertension of the neonate
ANA Antinuclear antibodies HCM Hypertrophic cardiomyopathy PPN Peripheral parenteral nutrition
ANC Absolute neutrophil count Hct Hematocrit PROM Premature rupture of membranes
ANLL Acute nonlymphoblastic leukemia HCV Hepatitis C virus PSVT Paroxysmal supraventricular tachycardia
APL Acute promyelocytic leukemia HDL-C High density lipoprotein cholesterol PT Prothrombin time
aPTT Activated partial thromboplastin time HER2 Human epidermal growth factor receptor 2 PTH Parathyroid hormone
ARB Angiotensin receptor blocker HF Heart failure PTSD Post-traumatic stress disorder
ARDS Acute respiratory distress syndrome HFA Hydrofluoroalkane PTT Partial thromboplastin time

American Society of Anesthesiologists - Physical Status (ASA-PS)

I: Normal, healthy patient

II: Patient having mild systemic disease

III: Patient having severe systemic disease

IV: Patient having severe systemic disease which is a constant threat to life

V: Moribund patient; not expected to survive without the procedure

VI: Patient declared brain-dead; organs being removed for donor purposes
HFSA Heart Failure Society of America PUD Peptic ulcer disease
AST Aspartate aminotransferase (formerly called SGOT) HIV Human immunodeficiency virus PVB Premature ventricular beats
ATP Adenosine triphosphate HMG-CoA 3-hydroxy-3-methylglutaryl-coenzyme A PVC Polyvinyl chloride
AUC Area under the curve (area under the serum concentration-time curve) HOCM Hypertrophic obstructive cardiomyopathy PVD Peripheral vascular disease
A-V Atrial-ventricular HPA Hypothalamic-pituitary-adrenal PVR Peripheral vascular resistance
AVNRT Atrioventricular nodal reentrant tachycardia HPLC High performance liquid chromatography QTc Corrected QT interval
AVRT Atrioventricular reentrant tachycardia HSV Herpes simplex virus QTc-F Corrected QT interval - Fridericia
BCRP Breast cancer resistance protein HTC Hematopoietic cell transplantation R Ringer's injection
BDI Beck Depression Inventory HTN Hypertension RA Rheumatoid arthritis
BEC Blood ethanol concentration HUS Hemolytic uremic syndrome RAP Right arterial pressure
BLS Basic life support IBD Inflammatory bowel disease RDA Recommended daily allowance
BMI Body mass index IBS Irritable bowel syndrome REM Rapid eye movement
BMT Bone marrow transplant IBW Ideal body weight REMS Risk evaluation and mitigation strategies
BP Blood pressure ICD Implantable cardioverter defibrillator RIA Radioimmunoassay
BPD Bronchopulmonary disease or dysplasia ICH Intracranial hemorrhage RNA Ribonucleic acid
BPH Benign prostatic hyperplasia ICP Intracranial pressure RPLS Reversible posterior leukoencephalopathy syndrome
BPRS Brief Psychiatric Rating Scale IDDM Insulin-dependent diabetes mellitus RSV Respiratory syncytial virus
BSA Body surface area IDSA Infectious Diseases Society of America SA Sinoatrial
BSEP Bile salt export pump IgG Immune globulin G SAD Seasonal affective disorder
BUN Blood urea nitrogen IM Intramuscular SAH Subarachnoid hemorrhage
CABG Coronary artery bypass graft ILCOR International Liaison Committee on Resuscitation SBE Subacute bacterial endocarditis
CAD Coronary artery disease INR International normalized ratio SBP Systolic blood pressure
CADD Computer ambulatory drug delivery Int. unit International unit Scr Serum creatinine
cAMP Cyclic adenosine monophosphate I.O. or IO Intraosseous SCLC Small cell lung cancer
CAN Canadian I & O Input and output SERM Selective estrogen receptor modulator
CAPD Continuous ambulatory peritoneal dialysis IOP Intraocular pressure SGA Small for gestational age
CAS Chemical abstract service IQ Intelligence quotient SGOT Serum glutamic oxaloacetic aminotransferase
CBC Complete blood count I.T. or IT Intrathecal SGPT Serum glutamic pyruvate transaminase
CBT Cognitive behavioral therapy ITP Immune thrombocytopenia SI International System of Units or Systeme international d'Unites
CDC Centers for Disease Control and Prevention IUD Intrauterine device SIADH Syndrome of inappropriate antidiuretic hormone secretion
CF Cystic fibrosis IUGR Intrauterine growth retardation SIDS Sudden infant death syndrome
CFC Chlorofluorocarbons IUS Intrauterine system SL Sodium lactate
CGI Clinical Global Impression IV Intravenous SLCO1B1 Solute carrier organic anion transporter family member 1B1
CHD Coronary heart disease IVH Intraventricular hemorrhage SLE Systemic lupus erythematosus
CHF Congestive heart failure; chronic heart failure IVP Intravenous push SLEDD Sustained low-efficiency daily diafiltration
CI Cardiac index IVPB Intravenous piggyback SNRI Serotonin norepinephrine reuptake inhibitor
CIE Chemotherapy-induced emesis JIA Juvenile idiopathic arthritis SR Sustained release
C-II Schedule two controlled substance JNC Joint National Committee SRI Serotonin reuptake inhibitor
C-III Schedule three controlled substance JRA Juvenile rheumatoid arthritis SSKI Saturated solution of potassium iodide
C-IV Schedule four controlled substance kg Kilogram SSRIs Selective serotonin reuptake inhibitors
C-V Schedule five controlled substance KIU Kallikrein inhibitor unit STD Sexually transmitted disease
CIV Continuous intravenous infusion KOH Potassium hydroxide STEMI ST-elevation myocardial infarction
Clcr Creatinine clearance LAMM L-α-acetyl methadol SUBQ, SubQ Subcutaneous
CLL Chronic lymphocytic leukemia LDH Lactate dehydrogenase SVR Systemic vascular resistance
Cmax Maximum plasma concentration LDL-C Low density lipoprotein cholesterol SVT Supraventricular tachycardia
Cmin Minimum plasma concentration LE Lupus erythematosus SWFI Sterile water for injection
CML Chronic myelogenous leukemia LFT Liver function test SWI Sterile water for injection
CMV Cytomegalovirus LGA Large for gestational age Half-life
CNS Central nervous system or coagulase negative staphylococcus LH Luteinizing hormone T3 Triiodothyronine
COLD Chronic obstructive lung disease LP Lumbar posture T4 Thyroxine
COMT Catechol-O-methyltransferase LR Lactated Ringer's solution TB Tuberculosis
COPD Chronic obstructive pulmonary disease LV Left ventricular TC Total cholesterol
COX Cyclooxygenase LVEF Left ventricular ejection fraction TCA Tricyclic antidepressant
CPK Creatine phosphokinase LVH Left ventricular hypertrophy TD Tardive dyskinesia
CPR Cardiopulmonary resuscitation MAC Mycobacterium avium complex TG Triglyceride
CRF Chronic renal failure MADRS Montgomery Asbery Depression Rating Scale TIA Transient ischemic attack
CRP C-reactive protein MAO Monoamine oxidase TIBC Total iron binding capacity
CrCl Creatinine clearance MAOIs Monamine oxidase inhibitors TMA Thrombotic microangiopathy
CRRT Continuous renal replacement therapy MAP Mean arterial pressure Tmax Time to maximum observed concentration, plasma
CSF Cerebrospinal fluid MDD Major depressive disorder TNF Tumor necrosis factor
CSII Continuous subcutaneous insulin infusion MDR1 Multidrug resistence protein 1 TPN Total parenteral nutrition
CT Computed tomography MDRD Modification of diet in renal disease TSH Thyroid stimulating hormone
CVA Cerebrovascular accident MDRSP Multidrug resistant streptococcus pneumoniae TT Thrombin time
CVP Central venous pressure MI Myocardial infarction UA Urine analysis
CVVH Continuous venovenous hemofiltration MMSE Mini mental status examination UC Ulcerative colitis
CVVHD Continuous venovenous hemodialysis M/P Milk to plasma ratio UGT UDP-glucuronosyltransferase
CVVHDF Continuous venovenous hemodiafiltration MPS I Mucopolysaccharidosis I ULN Upper limits of normal
CYP Cytochrome MRHD Maximum recommended human dose URI Upper respiratory infection
D5¼NS Dextrose 5% in sodium chloride 0.2% MRI Magnetic resonance imaging USAN United States Adopted Names
D5½NS Dextrose 5% in sodium chloride 0.45% MRP2 Multidrug resistance-associated protein 2 USP United States Pharmacopeia
D5LR Dextrose 5% in lactated Ringer's MRSA Methicillin-resistant Staphylococcus aureus UTI Urinary tract infection
D5NS Dextrose 5% in sodium chloride 0.9% MUGA Multiple gated acquisition scan UV Ultraviolet
D5W Dextrose 5% in water NAEPP National Asthma Education and Prevention Program Vd Volume of distribution
D10W Dextrose 10% in water NAS Neonatal abstinence syndrome Vdss Volume of distribution at steady-state
DBP Diastolic blood pressure NCI National Cancer Institute VEGF Vascular endothelial growth factor
DEHP Di(3-ethylhexyl)phthalate ND Nasoduodenal VF Ventricular fibrillation
DIC Disseminated intravascular coagulation NF National Formulary VLBW Very low birth weight
DLco Pulmonary diffusion capacity for carbon monoxide NFD Nephrogenic fibrosing dermopathy VMA Vanillylmandelic acid
DM Diabetes mellitus NG Nasogastric VT Ventricular tachycardia
DMARD Disease modifying antirheumatic drug NHL Non-Hodgkin lymphoma VTE Venous thromboembolism
DNA Deoxyribonucleic acid NIDDM Noninsulin-dependent diabetes mellitus vWD Von Willebrand disease
DSC Discontinued NIOSH National Institute for Occupational Safety and Health VZV Varicella zoster virus
DSM-IV Diagnostic and Statistical Manual NIH National Institute of Health WBC White blood cell [count]
DVT Deep vein thrombosis NKA No known allergies WHO World Health Organization
EBV Epstein-Barr virus NKDA No known drug allergies w/v Weight in volume
ECG Electrocardiogram NMDA N-methyl-d-aspartate w/w Weight in weight
ECHO Echocardiogram NMS Neuroleptic malignant syndrome XR Extended release
eGFR Estimated glomerular filtration rate NNRTI Non-nucleoside reverse transcriptase inhibitor YBOC Yale Brown Obsessive-Compulsive Scale
ECMO Extracorporeal membrane oxygenation NRTI Nucleoside reverse transcriptase inhibitor YMRS Young Mania Rating Scale
ECT Electroconvulsive therapy NS Normal saline (0.9% sodium chloride)    
ED Emergency department NSAID Nonsteroidal anti-inflammatory drug    
Abbreviation Meaning Abbreviation Meaning Abbreviation Meaning
Common weights, measures, or apothecary abbreviations that may be used in Lexicomp*
< Less than g Gram oz Ounce
> Greater than gr Grain pc, post cib After meals
Less than or equal to gtt One drop PM Afternoon or evening
Greater than or equal to h Hour P.O. By mouth
ac Before meals or food hs At bedtime P.R. Rectally
ad To, up to IN Intranasal prn As needed
ad lib At pleasure IT Intrathecal pulv A powder
AM Morning kcal Kilocalorie q Every
AMA Against medical advice kg Kilogram qad Every other day
amp Ampul L Liter qd Every day, daily
amt Amount liq A liquor, solution qh Every hour
aq Water M Molar qid Four times a day
aq. dest. Distilled water mcg Microgram qod Every other day
ASAP As soon as possible m. dict As directed qs A sufficient quantity
a.u. Each ear mEq Milliequivalent qs ad A sufficient quantity to make
bid Twice daily mg Milligram Rx Prescription drugs
bm Bowel movement microL Microliter S.L. Sublingual
C Celsius, centigrade min Minute stat At once, immediately
cal Calorie mL Milliliter SUBQ, SubQ Subcutaneous
cap Capsule mm Millimeter supp Suppository
cc Cubic centimeter mM Millimole syr Syrup
cm Centimeter mmHg Millimeters of mercury tab Tablet
comp Compound mo Month tal Such
cont Continue mOsm Milliosmoles tbsp Tablespoon
d Day ng Nanogram tid Three times a day
d/c Discharge nmol Nanomole tr, tinct Tincture
dil Dilute no. Number trit Triturate
disp Dispense noc In the night tsp Teaspoon
div Divide non rep Do not repeat, no refills u.d. As directed
dtd Give of such a dose NPO Nothing by mouth ung Ointment
Dx Diagnosis NV Nausea and vomiting v.o. Verbal order
elix, el Elixir O, Oct One pint w.a. While awake
emp As directed o.d. Right eye x3 Three times
et And o.l. Left eye x4 Four times
ex aq In water o.s. Left eye y Year
F Fahrenheit o.u. Each eye    
Age group definitions used in Lexicomp (unless otherwise specified within the monograph)
  • Neonate: 0 to 28 days of age
    • Gestational age (GA)[1]: Number of weeks from the first day of the mother's last menstrual period (LMP) until birth. For methods of assessing GA (eg, New Ballard score) refer to UpToDate topic review of postnatal assessment of gestational age.
    • Postnatal age (PNA)[1]: Chronological age since birth.
    • Postmenstrual age (PMA)[1]: PMA is calculated as gestational age plus postnatal age (PMA = GA + PNA).
    • Premature neonate[2]: Neonate born at <37 weeks gestational age.
    • Term neonate[2]: Neonate born at 37 weeks 0 days to 41 weeks 6 days (average ~40 weeks) gestational age.
  • Infant: >28 days to 1 year of age
  • Children: 1 to 12 years of age
  • AdolescentΔ: 13 to 18 years of age
  • Adult: >18 years of age
  • Geriatric: ≥65 years of age
NOTE: Country code definitions used in the "Brand Names: International" field of Lexicomp are provided in a separate table available in the international brand names field of each monograph.
* Additional abbreviations used and defined within a specific drug monograph or text piece may only apply to that text.
¶ These abbreviations are considered error-prone according to the Institute for Safe Medicine Practices.[3]
Δ Pregnant, postpartum, or lactating adolescent females are considered within adult information unless otherwise specified.
  1. Engle WA, American Academy of Pediatrics Committee on Fetus and Newborn. Age terminology during the perinatal period. Pediatrics 2004; 114:1362.
  2. Fleischman AR, Oinuma M, Clark SL. Rethinking the definition of "term pregnancy." Obstet Gynecol 2010; 116:136.
  3. The Institute for Safe Medication Practices (ISMP). List of Error-Prone Abbreviations, Symbols, and Dose Designations. Available at (Accessed on February 15, 2021).
Adapted with permission from: Lexicomp Online. Copyright © 1978-2022 Lexicomp, Inc. All Rights Reserved.
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