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) Enzyme-Linked Immunosorbent Assay (ELISA) (1) (-) Gas Chromatography/Mass Spectrometry (GC/MS) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (4) Sample Type Blood (3) (-) Fluid (1) Plasma (1) Serum or Plasma (2) Urine (3) Test Area (-) Diagnostic Aids (1) Drugs of Abuse (1) Test Category Biomarkers (1) Test Sub-Category Small Molecule (1) Test Test Name 0420FL Betahydroxybutyric Acid, Fluid