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) (2) (-) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Sample Type (-) Blood (1) Fluid (1) Test Area Diagnostic Aids (1) Test Category Biomarkers (1) Test Sub-Category Alkaloids (2) Anticoagulants (1) Barbiturates (6) Benzodiazepines (2) Beta Blockers (2) Designer Benzodiazepines (2) Opiates/Opioids (6) Other (17) (-) Small Molecule (1) Sympathomimetic Amines (2) Synthetic Cathinone (2) Test Test Name 0420B Betahydroxybutyric Acid, Blood