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.
Macrocytic anemia refers to large red blood cells that are few in number. Low levels of vitamin B-12 is a common cause of this type of anemia, but if the vitamin B-12 level is normal, there are other potential causes to look into.herefore, low levels of either of these B vitamins can lead to large red blood cells. In addition, low thyroid hormone levels, liver disease, bone marrow disorders and pregnancy are other causes of large red blood cells with normal B-12 levels..