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 (1) Urine (1) Test Area Diagnostic Aids (1) Test Category Anesthetics (1) Antidepressants (1) (-) Biomarkers (1) Depressants (2) Electrolytes (1) Metals/Elements (1) Muscle Relaxants (1) Sedative/Hypnotics (1) Test Sub-Category Small Molecule (1) Test Test Name 0420FL Betahydroxybutyric Acid, Fluid