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.
PA is a type of macrocytic anemia and is sometimes called megaloblastic anemia because of the large size of the red blood cells produced. Anemia is a medical condition in which the blood is low in normal red blood cells. Macrocytic anemia is not unique to PA and can have other causes including: 1  long-term use of certain medications and antibiotics (methotrexate, azathioprine, etc.). 2  chronic obstructive pulmonary disease (COPD).