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) Inductively Coupled Plasma/Optical Emission Spectrometry (ICP/OES) (1) Sample Type Blood (2) (-) Fluid (1) Hair (1) (-) RBCs (1) Serum or Plasma (1) Stool (1) Urine (1) Test Area Exposure (2) Test Category Metals/Elements (2) Test Sub-Category Benzodiazepines (1) Beta Blockers (1) (-) Macrominerals (2) Opiates/Opioids (2) Other (7) Toxic Elements (2) Trace Elements (3) Test Test Name 2551FL Magnesium - Total, Fluid 2551R Magnesium - Total, RBCs