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) (2) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (7) (-) Spectrophotometry (SP) (2) Sample Type Blood (1) RBCs (1) Test Area Exposure (2) Test Category Acids (3) Alcohols (3) Analgesics (1) Anesthetics (4) Antidepressants (9) Antiepileptics/Antiseizures (3) Antihypertensives (5) Antimicrobials (3) Antipsychotics (6) (-) Biomarkers (2) Cholinesterase Inhibitors (3) Depressants (2) Sedative/Hypnotics (1) Solvents (4) Terpenes (1) Volatiles (5) Test Sub-Category Other (2) Test Test Name 4235B Sulfhemoglobin, Blood 4235R Sulfhemoglobin, RBCs