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 (3) (-) RBCs (1) Serum or Plasma (3) Urine (2) Test Area Exposure (1) Test Category Analgesics (1) Antidepressants (8) Antiepileptics/Antiseizures (3) Antihypertensives (4) Antipsychotics (4) (-) Biomarkers (1) Metals/Elements (6) Pesticides/Insecticides (2) Sedative/Hypnotics (1) Test Sub-Category Other (1) Test Test Name 4235R Sulfhemoglobin, RBCs