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) (2) Sample Type (-) Blood (1) (-) RBCs (1) Test Area Exposure (2) Test Category (-) Biomarkers (2) Test Sub-Category Other (2) Test Test Name 4235B Sulfhemoglobin, Blood 4235R Sulfhemoglobin, RBCs