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 (1) Meconium (1) (-) Serum or Plasma (1) Umbilical Cord (1) Urine (1) 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 (1) Antineoplastics (1) Antipsychotics (1) Antithrombotics (2) Antitussives/Cough Suppressants (1) Benzodiazepines (1) (-) Biomarkers (1) Depressants (2) Diuretics (1) Metals/Elements (5) Muscle Relaxants (1) NPS/Designer Drugs (2) Plasticizers (1) Sedative/Hypnotics (5) Stimulants (1) Test Sub-Category Small Molecule (1) Test Test Name 0642SP Betahydroxybutyric Acid, Serum/Plasma