Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Blood (1) (-) Serum or Plasma (1) Urine (1) Test Area Drugs of Abuse (3) Postmortem (8) (-) Therapeutics (1) Test Category Muscle Relaxants (1) Test Sub-Category Other (1) Test Test Name 2720SP Metaxalone, Serum/Plasma