Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content + Download Section PDF ++ Table Graphic Jump Location|Download (.pdf)|Print Ab Antibody Abn Abnormal AFB Acid-fast bacillus Ag Antigen AIDS Acquired immunodeficiency syndrome ALT Alanine aminotransferase ANA Antinuclear antibody AST Aspartate aminotransferase CBC Complete blood count CF Complement fixation CK Creatine kinase CNS Central nervous system CSF Cerebrospinal fluid CXR Chest x-ray CYP Cytochrome P450 Diff Differential cell count EDTA Ethylenediaminetetraacetic acid (edetate) ELISA Enzyme-linked immunosorbent assay GI Gastrointestinal GNR Gram-negative rod GNCB Gram-negative coccobacillus GPC Gram-positive coccus GVCB Gram-variable coccobacillus HF Heart failure HLA Human Leukocyte Antigen Ig Immunoglobulin IM Intramuscular(ly) INR International Normalized Ratio IV Intravenous(ly) min Minute MN Mononuclear cell MRI Magnetic resonance imaging N Normal Neg Negative NPO Nothing by mouth (nil per os) PCR Polymerase chain reaction PO Orally (per os) Pos Positive PMN Polymorphonuclear neutrophil (leukocyte) POCT Point-of-care testing PTH Parathyroid hormone RBC Red blood cell SIADH Syndrome of inappropriate antidiuretic hormone (secretion) SLE Systemic lupus erythematosus SPEP/IFE Serum protein electrophoresis/immunofixation electrophoresis T3 Triiodothyronine T4 Tetraiodothyronine (thyroxine) TSH Thyroid-stimulating hormone V Variable VDRL Venereal Disease Research Laboratory (syphilis test) WBC White blood cell wk Week yr Year ↑ Increased ↓ Decreased ↔ No change