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) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (1) Sample Type Blood (3) Fluid (1) (-) RBCs (1) Serum or Plasma (2) Stool (1) (-) Tissue (1) Urine (2) Test Area Exposure (1) Therapeutics (1) Test Category Metals/Elements (1) Stimulants (1) Test Sub-Category (-) CNS Stimulants (1) (-) Macrominerals (1) Opiates/Opioids (1) Other (8) Selective Serotonin Reuptake Inhibitors (SSRI) (1) Toxic Elements (2) Trace Elements (1) Tricyclic (1) Test Test Name 3020TI Methylphenidate and Metabolite, Tissue 3784R Potassium - Total, RBCs