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 (2) (-) Serum or Plasma (1) Urine (2) Test Area Diagnostic Aids (1) Test Category Biomarkers (1) Test Sub-Category Alkaloids (1) Alkylating Agents (1) Anticoagulants (2) Aromatics (1) Barbiturates (6) Benzodiazepines (3) Beta Blockers (1) Designer Benzodiazepines (1) Opiates/Opioids (6) Other (12) (-) Small Molecule (1) Solvents (1) Sympathomimetic Amines (1) Synthetic Cathinone (1) Toxic Elements (5) Test Test Name 0642SP Betahydroxybutyric Acid, Serum/Plasma