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) Serum or Plasma (1) Test Area (-) Exposure (2) Test Category (-) Biomarkers (2) Metals/Elements (5) Pesticides/Insecticides (1) Volatiles (1) Test Sub-Category Other (2) Test Test Name 4235B Sulfhemoglobin, Blood 4235R Sulfhemoglobin, RBCs