<prompt> Answer this question truthfullyHow can iron deficiency anemia be differentiated from thalassemia?  <response>: <reason> Iron deficiency anemia can be differentiated from thalassemia by an elevated red cell distribution width RDW. RDW is a measure of the variation in the size of red blood cells. In iron deficiency anemia, the RDW is typically elevated because there is a wide variation in the size of the red blood cells. In thalassemia, the RDW is usually normal or only slightly elevated because the red blood cells are all small and of similar size. It is important to accurately diagnose the cause of anemia in order to provide appropriate treatment. If you are experiencing symptoms of anemia or have concerns about your iron levels, it is important to speak with your healthcare provider. They can perform tests to determine the cause of your anemia and recommend appropriate treatment. 