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 Alcohols (2) Analgesics (3) Anesthetics (1) Antianxiety (1) Antiarrhythmics (1) Anticholinergics (2) Antidepressants (2) Antiepileptics/Antiseizures (1) Antihistamines (2) Antithrombotics (1) Antitussives/Cough Suppressants (1) Benzodiazepines (1) (-) Biomarkers (1) Depressants (2) Diuretics (1) Metals/Elements (5) Muscle Relaxants (1) NPS/Designer Drugs (2) Sedative/Hypnotics (5) Stimulants (1) Volatiles (2) Test Sub-Category Small Molecule (1) Test Test Name 0420B Betahydroxybutyric Acid, Blood