102 video review lessons. Review AP US History by watching and listening to over 18 hours worth of videos carefully coordinated to the AP US History syllabus. 290 AP US History practice questions. Test your understanding of each concept without having to take an entire AP US History practice exam. Customized AP US History study plan.
In fact the most common cause of microcytic anemia is iron deficiency, and in low risk patients physicians often confirm the diagnosis of iron deficiency as the cause by a good response to iron therapy.
1 Megaloblastic anemia, the most common cause of macrocytic anemia, is due to a deficiency of either vitamin B12, folic acid, or both. 2  Deficiency in folate and/or vitamin B 12 can be due either to inadequate intake or insufficient absorption.