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) (2) Sample Type Blood (2) Fluid (1) Hair (1) (-) RBCs (1) Serum or Plasma (3) Stool (1) (-) Urine (1) Test Area Exposure (2) Test Category Metals/Elements (2) Test Sub-Category Alkaloids (1) Barbiturates (1) Benzodiazepines (1) Beta Blockers (1) CNS Stimulants (2) Dopamine Antagonists (1) Hormones (1) (-) Macrominerals (2) Opiates/Opioids (8) Other (33) Serotonin-Norepinephrine Reuptake Inhibitors (SNRI) (1) Tetracyclics (2) Toxic Elements (1) Trace Elements (4) Test Test Name 2551R Magnesium - Total, RBCs 2551U Magnesium - Total, Urine