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 (14) Fluid (1) (-) RBCs (1) Serum or Plasma (10) Tissue (1) Urine (14) Test Area (-) Exposure (1) Test Category Biomarkers (1) Test Sub-Category (-) Other (1) Toxic Elements (2) Trace Elements (2) Test Test Name 4235R Sulfhemoglobin, RBCs