Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Gas Chromatography/Mass Spectrometry (GC/MS) (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) Barbiturates (3) Benzodiazepines (2) Beta Blockers (1) Opiates/Opioids (3) Other (11) (-) Small Molecule (1) Sympathomimetic Amines (1) Test Test Name 0420B Betahydroxybutyric Acid, Blood