FERRITIN IS A BLOOD TEST THAT MEASURES THE AMOUNT OF FERRITIN IN YOUR BLOOD AND IS A BLOOD CELL PROTEIN THAT CONTAINS IRON. FERRITIN IS THE MAJOR “IRON” STORAGE PROTEIN IN THE BODY, A FERRITIN BLOOD TEST HELPS YOUR DOCTOR UNDERSTAND HOW MUCH IRON YOUR BODY IS STORING. FERRITIN LEVELS ARE LOW IN PEOPLE WHO ARE IRON DEFICIENT ANEMIA AND ELEVATED IN THOSE WITH HEMOCHROMATOSIS.