Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (1) Sample Type Blood (15) Fluid (2) (-) RBCs (1) Serum or Plasma (13) Stool (1) Tissue (1) Urine (10) Test Area Drugs of Abuse (1) (-) Exposure (1) Test Category Metals/Elements (1) Test Sub-Category Macrominerals (1) Test Test Name 3784R Potassium - Total, RBCs