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 (8) Antiarrhythmics (1) Anticholinergics (4) Antidepressants (2) Antiepileptics/Antiseizures (1) Antimigraines (2) (-) Biomarkers (1) Diagnostic Aids (1) Immunosuppressants (1) Metals/Elements (9) NPS/Designer Drugs (5) Opiates/Opioids (2) Pesticides/Insecticides (2) Sedative/Hypnotics (3) Vasodilators (2) Volatiles (2) Test Sub-Category Other (1) Test Test Name 4235B Sulfhemoglobin, Blood