Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (3) (-) Spectrophotometry (SP) (1) Sample Type Blood (1) (-) RBCs (1) Serum or Plasma (2) Test Area Test Category Test Sub-Category Test Test Name 4235R Sulfhemoglobin, RBCs