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 (46) Fluid (7) Hair (1) Meconium (1) Oral Fluid (Saliva) (1) (-) RBCs (1) Serum or Plasma (35) Stool (1) Tissue (8) Urine (24) Test Area Exposure (1) Test Category Metals/Elements (1) Test Sub-Category (-) Macrominerals (1) Test Test Name 3784R Potassium - Total, RBCs