Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Enzyme-Linked Immunosorbent Assay (ELISA) (9) Enzyme Immunoassay (EIA) (2) Gas Chromatography/Mass Spectrometry (GC/MS) (5) Headspace Gas Chromatography (GC) (7) (-) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (2) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (6) Sample Type (-) Blood (1) Serum or Plasma (1) (-) Urine (1) Test Area Therapeutics (2) Test Category Muscle Relaxants (2) Test Sub-Category Other (2) Test Test Name 2720B Metaxalone, Blood 2720U Metaxalone, Urine