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 (1) Serum or Plasma (2) Urine (3) Test Area Diagnostic Aids (1) Test Category Analgesics (3) Anesthetics (1) Antianxiety (2) Anticholinergics (1) Anticoagulants (1) Antidepressants (3) Antiepileptics/Antiseizures (2) Antihypertensives (1) Antimicrobials (1) (-) Biomarkers (1) Bronchodilators (2) Depressants (5) Electrolytes (1) Metals/Elements (7) Psychoactives (3) Solvents (1) Stimulants (4) Volatiles (1) Test Sub-Category Small Molecule (1) Test Test Name 0420FL Betahydroxybutyric Acid, Fluid