Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Enzymatic Assay (EZA) (1) Sample Type Blood (1) Fluid (1) Serum or Plasma (1) (-) Urine (1) Test Area (-) Diagnostic Aids (1) Test Category Analgesics (3) Anesthetics (2) Antianxiety (1) Antiarrhythmics (1) Anticholinergics (2) Antidepressants (2) Antihistamines (1) Antitussives/Cough Suppressants (1) (-) Biomarkers (1) Depressants (2) Electrolytes (1) Muscle Relaxants (1) Sedative/Hypnotics (3) Stimulants (1) Test Sub-Category Small Molecule (1) Test Test Name 0642U Betahydroxybutyric Acid, Urine