Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) (-) Colorimetry (C) (1) (-) Enzymatic Assay (EZA) (2) Gas Chromatography (GC) (9) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (7) Sample Type Serum or Plasma (1) Urine (2) Test Area Exposure (3) Test Category Other (3) Test Sub-Category Opiates/Opioids (8) (-) Other (3) Test Test Name 1352U o-Cresol, Urine 3250SP Oxalate, Serum/Plasma 3250U Oxalate, Urine