Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Spectrophotometry (SP) (1) Sample Type Blood (1) (-) RBCs (1) Serum or Plasma (1) Test Area Exposure (1) Test Category Analgesics (4) Anticholinergics (2) Antidepressants (1) Antimigraines (1) (-) Biomarkers (1) Diagnostic Aids (1) Metals/Elements (7) NPS/Designer Drugs (3) Opiates/Opioids (1) Pesticides/Insecticides (1) Sedative/Hypnotics (1) Vasodilators (1) Volatiles (1) Test Sub-Category Other (1) Test Test Name 4235R Sulfhemoglobin, RBCs