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 (64) Fluid (8) Meconium (1) (-) RBCs (1) Serum or Plasma (64) Tissue (7) Urine (38) 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