Rice Krispies noun (A trademark for) a breakfast cereal made from grains of rice which are steamed, sweetened, and then heated rapidly in the manner of popcorn; (also in singular) a piece of this cereal.
A ferritin test measures the amount of ferritin in your blood. Ferritin is a blood cell protein that contains iron. A ferritin test helps your doctor understand how much iron your body is storing.
If you are always tired you may have iron deficiency anemia. This test is may be needed if other initial iron tests for hemoglobin (level of oxygen carrying protein) or hematocrit (proportion of red blood cells to the fluid component) are low. A ferritin test can confirm a diagnosis of iron deficiency anemia.