The possible causes of high ferritin measurement at 12 weeks of pregnancy are ischemic anemia, inflammation and infection, and hyperthyroidism. 1. Iron deficiency anemia: pregnancy is a special period in a woman’s life, during which the high demand for nutrients may lead to the occurrence of iron deficiency anemia, and then ferritin may be elevated. 2. Inflammatory infections: after pregnancy, hormonal changes in the body, the immune system may be reduced, and infections may occur, which will likely lead to high ferritin. 3. Hyperthyroidism: If there is hyperthyroidism, it may also cause the ferritin test value to be affected. In addition to the above reasons, there are other reasons, found that elevated ferritin must be in the regular hospital to clarify the cause of the disease, and then symptomatic treatment.