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) (3) (-) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Sample Type Blood (1) (-) Fluid (1) Test Area Diagnostic Aids (1) Test Category Biomarkers (1) Test Sub-Category Barbiturates (4) Other (3) (-) Small Molecule (1) Test Test Name 0420FL Betahydroxybutyric Acid, Fluid