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 (19) Fluid (4) (-) RBCs (1) Serum or Plasma (19) Tissue (3) Urine (16) Test Area Exposure (1) Test Category Biomarkers (1) Test Sub-Category (-) Other (1) Trace Elements (1) Test Test Name 4235R Sulfhemoglobin, RBCs