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) Headspace Gas Chromatography (GC) (1) Sample Type Blood (1) Serum or Plasma (2) (-) Urine (1) Test Area Diagnostic Aids (1) Test Category Antihistamines (1) (-) Biomarkers (1) Electrolytes (1) Sedative/Hypnotics (1) Volatiles (2) Test Sub-Category Small Molecule (1) Test Test Name 0642U Betahydroxybutyric Acid, Urine