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) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Sample Type (-) Serum or Plasma (1) Urine (1) Test Area Diagnostic Aids (1) Test Category Analgesics (4) Anesthetics (2) Antianxiety (2) Antiarrhythmics (2) Anticholinergics (4) Antidepressants (4) Antiepileptics/Antiseizures (2) Antineoplastics (1) Antipsychotics (1) Antithrombotics (3) Benzodiazepines (2) (-) Biomarkers (1) Depressants (2) Diuretics (2) Muscle Relaxants (2) NPS/Designer Drugs (4) Stimulants (2) Test Sub-Category Small Molecule (1) Test Test Name 0642SP Betahydroxybutyric Acid, Serum/Plasma