Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (1) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (4) (-) Spectrophotometry (SP) (2) Sample Type Blood (1) RBCs (1) Test Area Exposure (2) Test Category Analgesics (4) Anesthetics (3) Antiarrhythmics (4) Anticholinergics (3) Antidepressants (6) Antidiabetics (4) Antiepileptics/Antiseizures (20) Antimigraines (3) Antineoplastics (2) Antipsychotics (17) Antirheumatics (2) (-) Biomarkers (2) Bronchodilators (3) Cholinesterase Inhibitors (2) Diuretics (4) Hallucinogens (3) Hypoglycemic Agents (2) Immunosuppressants (7) Muscle Relaxants (2) Opiates/Opioids (3) Other (2) Pesticides/Insecticides (5) Sedative/Hypnotics (9) Vasodilators (7) Volatiles (2) Test Sub-Category (-) Other (2) Test Test Name 4235B Sulfhemoglobin, Blood 4235R Sulfhemoglobin, RBCs