In this post I’ll cover everything you need to know about ferritin and hypothyroidism. The ferritin test is a simple blood test and it is one of the most important tests you should have if you have Hashimoto’s disease, Graves’ disease, and hypothyroidism. Ferritin is a storage form of iron and the ferritin level test can tell you if your iron stores are low and need to be increased. The ferritin test is rarely ordered by conventional doctors so many patients are left with the signs and symptoms of hypothyroidism when it is actually their low ferritin levels that are causing their health problems. The first issue with iron is that iron deficiency may be quite severe but blood markers such as hemoglobin and the red blood cell count may be normal. This leaves many patients, especially women, misdiagnosed as not having anemia.