Abbreviations for Diagnostic and Laboratory Tests
| AAT | Alpha1-antitrypsin |
| ABEP | Auditory brainstem evoked potential |
| ABGs | Arterial blood gases |
| ACE | Angiotensin-converting enzyme |
| ACT | Activated clotting time |
| ACTH | Adrenocorticotropic hormone |
| ADH | Antidiuretic hormone |
| AFB | Acid-fast bacilli |
| AFP | Alpha-fetoprotein |
| A/G ratio | Albumin/globulin ratio |
| AIT | Agglutination inhibition test |
| ALA | Aminolevulinic acid |
| ALP | Alkaline phosphatase |
| ALT | Alanine aminotransferase |
| AMA | Antimitochondrial antibody |
| ANA | Antinuclear antibody |
| ANC | Absolute neutrophil count |
| ANCA | Antineutrophil cytoplasmic antibody |
| ANP | Atrial natriuretic peptide |
| APCA | Anti–parietal cell antibody |
| APTT | Activated partial thromboplastin time |
| ASMA | Anti–smooth muscle antibody |
| ASO | Antistreptolysin O titer |
| AST | Aspartate aminotransferase |
| B2M | Beta2 microglobulin |
| BE | Barium enema |
| BMC | Bone mineral count |
| BMD | Bone mineral density |
| BPP | Biophysical profile |
| BRCA | Breast cancer |
| BTA | Bladder tumor antigen |
| BSAP | Bone specific alkaline phosphatase |
| BNP | Brain natriuretic peptide |
| BUN | Blood urea nitrogen |
| Ca | Calcium |
| CAT | Computerized axial tomography |
| CBC | Complete blood cell count |
| CrCl | Creatinine clearance |
| CEA | Carcinoembryonic antigen |
| CK | Creatine kinase |
| Cl | Chloride |
| CLO | Campylobacter-like organism |
| CMG | Cystometrogram |
| CMV | Cytomegalovirus |
| CNP | C-type natriuretic peptide |
| CO | Carbon monoxide |
| CO2 | Carbon dioxide |
| COHb | Carboxyhemoglobin test |
| CP, CPK | Creatine phosphokinase |
| CRP | C-reactive protein |
| C&S | Culture and sensitivity |
| CSF | Cerebrospinal fluid |
| CST | Contraction stress test |
| CT | Computed tomography |
| cTnI | Cardiac troponin I |
| cTnT | Cardiac troponin T |
| CVB | Chorionic villi biopsy |
| CVS | Chorionic villi sampling |
| CXR | Chest x-ray |
| D&C | Dilation and curettage |
| DEXA | Dual-energy x-ray absorptiometry |
| DHEA | Dehydroepiandrosterone |
| DIC | Disseminated intravascular coagulation |
| DSMA | Disodium monomethane arsonate renal scan |
| DPA | Dual-photon absorptiometry |
| DSA | Digital subtraction angiography |
| DST | Dexamethasone suppression test |
| EBV | Epstein-Barr virus |
| ECG, EKG | Electrocardiogram |
| ECHO | Echocardiography |
| EEG | Electroencephalogram |
| EFS | Esophageal function studies |
| EGD | Esophagogastroduodenoscopy |
| EIA | Enzyme immunoassay |
| ELISA | Enzyme-linked immunosorbent assay |
| EMA | Endomysial antibody |
| EMG | Electromyography |
| ENG | Electroneurography |
| EP | Evoked potential |
| EPO | Erythropoietin |
| EPS | Electrophysiologic study |
| ER | Estrogen receptor |
| ERCP | Endoscopic retrograde cholangiopancreatography |
| ESR | Erythrocyte sedimentation rate |
| EUG | Excretory urography |
| FBS | Fasting blood sugar |
| FDPs | Fibrin degradation products |
| Fe | Iron |
| fFN | Fetal fibronectin |
| FIT | Fecal immunochemical test |
| %FPSA | Percent free prostate-specific antigen |
| FSH | Follicle-stimulating hormone |
| FSPs | Fibrin split products |
| FTA-ABS | Fluorescent treponemal antibody absorption test |
| FTI | Free thyroxine index |
| FUT | Fibrinogen uptake test |
| FVL | Factor V-Leiden |
| G-6-PD | Glucose-6-phosphate dehydrogenase |
| GAD ab | Glutamic acid decarboxylase antibody |
| GB series | Gallbladder series |
| GE reflux | Gastroesophageal reflux |
| GER scan | Gastroesophageal reflux scan |
| GGT | γ-Glutamyl transferase |
| GGTP | γ-Glutamyl transpeptidase |
| GH | Growth hormone |
| GHb, GHB | Glycosylated hemoglobin |
| GI series | Gastrointestinal series |
| GTT | Glucose tolerance test |
| HAA | Hepatitis-associated antigen |
| HAI | Hemagglutination inhibition |
| HAV | Hepatitis A virus |
| Hb, Hgb | Hemoglobin |
| HBcAb | Hepatitis B core antibody |
| HBcAg | Hepatitis B core antigen |
| HBV | Hepatitis B virus |
| HCG | Human chorionic gonadotropin |
| HCO3 | Bicarbonate |
| HCS | Human chorionic somatomammotropin |
| Hct | Hematocrit |
| Hcy | Homocysteine |
| HDL | High-density lipoprotein |
| 5-HIAA | 5-Hydroxyindoleacetic acid |
| HIDA | Hepatic iminodiacetic acid |
| HIV | Human immunodeficiency virus |
| HLA | Human lymphocyte antigen |
| HPL | Human placental lactogen |
| HPV | Human papillomavirus |
| HSV-2 | Herpes simplex virus, type 2 |
| HTLV | Human T-cell lymphotrophic virus |
| Ig | Immunoglobulin |
| IAA | Insulin autoantibody |
| ICA | Islet cell antibody |
| IFE | Immunofixation electrophoresis |
| IGF | Insulin-like growth factor |
| INR | International normalization ratio |
| ITT | Insulin tolerance test |
| IVC | Intravenous cholangiography |
| IV-GTT | Intravenous glucose tolerance test |
| IVP | Intravenous pyelography |
| IVU, IUG | Intravenous urography |
| LAP | Leucine aminopeptidase |
| LATS | Long-acting thyroid-stimulator |
| LDH | Lactic dehydrogenase |
| LDL | Low-density lipoprotein |
| LE | Lupus erythematosus |
| LES | Lower esophageal sphincter |
| LFTs | Liver function tests |
| LH | Luteinizing hormone |
| LP | Lumbar puncture |
| Lp(a) | Lp(a) lipoprotein |
| L/S ratio | Lecithin/sphingomyelin ratio |
| LS spine | Lumbosacral spine |
| MCH | Mean corpuscular hemoglobin |
| MCHC | Mean corpuscular hemoglobin concentration |
| MCV | Mean corpuscular volume |
| M/E ratio | Myeloid/erythroid ratio |
| Mg | Magnesium |
| MPG | Mean plasma glucose |
| MPV | Mean platelet volume |
| MRA | Magnetic resonance angiography |
| MRI | Magnetic resonance imaging |
| MUGA | Multigated acquisition cardiac scan |
| Na | Sodium |
| NMR | Nuclear magnetic resonance |
| NMP22 | Nuclear matrix protein 22 |
| NST | Nonstress test |
| NTx | N-Telopeptide |
| OB | Occult blood |
| OCT | Oxytocin challenge test |
| OGTT | Oral glucose tolerance test |
| 17-OHCS | 17-Hydroxycorticosteroids |
| O&P | Ova and parasites |
| OPG | Oculoplethysmography |
| P | Phosphorus |
| PAB | Prealbumin |
| PAI-1 | Plasminogen activator inhibitor-1 |
| PAP | Prostatic acid phosphatase |
| PAPP | Pregnancy-associated plasma protein |
| Pb | Lead |
| PCO2 | Partial pressure of carbon dioxide |
| PET | Positron-emission tomography |
| PFTs | Pulmonary function tests |
| pH | Hydrogen ion concentration |
| PKU | Phenylketonuria |
| PMN | Polymorphonuclear (type of WBC) |
| PNH | Paroxysmal nocturnal hemoglobinuria |
| Po2 | Partial pressure of oxygen |
| PO4 | Phosphate |
| PPBS | Postprandial blood sugar |
| PPD | Purified protein derivative |
| PPG | Postprandial glucose |
| PR | Progesterone receptor |
| PRA | Plasma renin assay |
| PSA | Prostate-specific antigen |
| PSG | Polysomnography |
| PT | Prothrombin time |
| PTH | Parathormone, parathyroid hormone |
| PTC, PTCH | Percutaneous transhepatic cholangiography |
| PTT | Partial thromboplastin time |
| PYD | Pyridium |
| RAIU | Radioactive iodine uptake |
| RAST | Radioallergosorbent test |
| RBC | Red blood cell |
| RDW | Red cell distribution width |
| RF | Rheumatoid factor |
| RIA | Radioimmunoassay |
| RPR | Rapid plasma reagin test |
| RRA | Radioreceptor assay |
| S&A | Sugar and acetone |
| SACE | Serum angiotensin-converting enzyme |
| SARS | Severe acute respiratory syndrome |
| SBF | Small bowel follow-through |
| SER | Somatosensory evoked responses |
| SGOT | Serum glutamic oxaloacetic transaminase |
| SGPT | Serum glutamic pyruvic transaminase |
| SLE | Systemic lupus erythematosus |
| SPECT | Single-photon emission computed tomography |
| STS | Serologic test for syphilis |
| T3 | Triiodothyronine |
| T4 | Thyroxine |
| TBG | Thyroxine-binding globulin |
| TBII | Thyroid binding inhibitory immunoglobulin |
| TBPA | Thyroxine-binding prealbumin |
| TDM | Therapeutic drug monitoring |
| TEE | Transesophageal echocardiography |
| TGs | Triglycerides |
| TIBC | Total iron-binding capacity |
| TPI | Treponema pallidum immobilization |
| TRAP | Tartrate-resistant acid phosphatase |
| TRF | Thyrotropin releasing factor |
| TRH | Thyrotropin releasing hormone |
| T&S | Type and screen |
| TSH | Thyroid-stimulating hormone |
| TSI | Thyroid-stimulating immunoglobulin |
| TTE | Transthoracic echocardiography |
| UA | Urinalysis |
| UGI series | Upper gastrointestinal series |
| UPP | Urethral pressure profile |
| US | Ultrasound |