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.
If in normocytic anemia the MCV is normal but RDW is increased, then a suspicion of an early case of folate, vitamin B12, or iron deficiency may be appropriate. Normally, prolonged cases of folate and vitamin B12 deficiency cause macrocytic anemia, where the red blood cells are large. Conversely, chronic cases of iron deficiency anemia, the leading cause of anemia worldwide, are microcytic. This is where red blood cells are small in size.