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 the results of a ferritin test are lower than normal, it may indicate that the individual has low iron in the blood, or has anemia, according to Mayo Clinic. In this case, working with a doctor to find the cause is important, as anemia often makes people feel tired and weak.