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 Barbiturates (2) Designer Benzodiazepines (1) Opiates/Opioids (1) (-) Small Molecule (1) Synthetic Cathinone (1) Test Test Name 0642SP Betahydroxybutyric Acid, Serum/Plasma