Biological Markers / Agents

Abnormal Genetic or Biochemical Markers Acetoacetate Acetone Acetylcholine Acetylcholine Receptor Antibody (AChR) Acid Phosphatase Adenosine triphosphate Adenovirus Serology Adrenocorticotrophic hormone Alanine Alanine (Urine) Alanine Aminotransferase (ALT) Albumin (Blood) Albumin (Cerebrospinal Fluid, CSF) Aldosterone Alkaline Phosphatase (ALP) Alpha 1-antitrypsin alpha 2-macroglobulin Alpha Amino N Buryric Acid (Urine) Alpha Aminoadipic Acid (Urine) Alpha-1 Antintrypsin (AAT) alpha-1-Fetoprotein Alpha-1-Globulin (Blood, Serum) Alpha-1-Globulin (Cerebrospinal Fluid, CSF) Alpha-2-Globulin (Blood, Serum) Alpha-2-Globulin (Cerebrospinal Fluid, CSF) alpha-Aminobutyric acid Alpha-Fetoprotein (Amniotic Fluid, Following Amniocentesis at 12 to 16 Weeks) Alpha-Fetoprotein (Maternal Serum, Pregnancy 15-18 Weeks) Alpha-Fetoprotein (Non-Pregnant, Serum) alpha-Ketonic acids, adult alpha-Tocopherol (Vitamin E) Aluminum Amino acids Ammonia Amniotic Fluid Bilirubin Amniotic Fluid Foam Stability Index Amniotic Fluid Index (AFI) Amniotic Fluid Lecithin to Sphingomyelin Ratio (L to S Ratio) Amylase Androstenedione Androsterone Angiotensin Converting Enzyme (ACE) Angiotensin I Angiotensin II Anion Gap (Excluding Potassium) Anion Gap (Including Potassium) Antiglomerular Basement Membrane (AGBM) Antibodies Antihemophilic factor Antithrombin 111 (AT-111) Apolipoprotein A (Apo A) Apolipoprotein B (Apo B) Arden Ratio (Ratio of Maximum Retinal Potential in Light Versus Dark) Arginine Arginine (Urine) Arsenic Ascaris Lumbricoides (Ascariasis on Stool or Sputum Smear) Ascorbic acid (Vitamin C) Asparagine (Urine) Aspartate Aminotransferase (AST) Aspartic acid Aspartic acid (in WBCs) Aspartic Acid (Urine) Aspergillus Fumigatus, Flavus or Terreus on Smear Avian Influenza Virus Culture or PCR (H5N1 Culture or Polymerase Chain Reaction)