Test your Ferritin Levels at Home! A Ferritin test measures the amount of Ferritin in your blood. Ferritin is a protein responsible for iron storage and without enough of it, your body will experience iron deficiency, one of the most common global deficiencies. This can result in tiredness, paleness, dry skin, brittle fingernails, and increased susceptibility to infections, and even Anemia. A dietary change or supplements are the best ways to correct imbalanced Ferritin levels. With the cerascreen® Ferritin Test, find out your ferritin levels. Ferritin is the form iron takes when stored in your blood, making this the most effective way to test for iron deficiency. The result gives you an indication of a possible iron deficiency. The test is made up of an at-home sample collection kit and prepaid return shipping envelope. You can painlessly collect a few drops of blood on our sample card, and your sample will be evaluated in a CLIA-certified medical laboratory.