Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (3) Enzymatic Assay (EZA) (3) Gas Chromatography (GC) (4) (-) Gas Chromatography/Mass Spectrometry (GC/MS) (2) Headspace Gas Chromatography (GC) (4) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (7) Spectrophotometry (SP) (3) Sample Type Blood (1) Fluid (1) Test Area Diagnostic Aids (2) Test Category Acids (3) Alcohols (3) Analgesics (7) Anesthetics (4) Antianxiety (3) Antidepressants (8) Antihistamines (2) (-) Biomarkers (2) Depressants (6) Drugs of Abuse (7) Drugs of Abuse, Therapeutics (1) Gases (4) Industrial/Environmental Toxins (1) Muscle Relaxants (7) Other (2) Plasticizers (2) Sedative/Hypnotics (28) Solvents (4) Therapeutics (10) Volatiles (13) Test Sub-Category Small Molecule (2) Test Test Name 0420B Betahydroxybutyric Acid, Blood 0420FL Betahydroxybutyric Acid, Fluid