The healthcare provider asks about your child's symptoms, diet, and health history. A physical exam is also done. Your child will need lab tests, such as a complete blood cell count to confirm there is anemia. Other tests may be done to learn if the anemia is caused by bleeding or low iron levels and to find the reason for low iron levels. The tests will also help diagnose any other causes of anemia, such as vitamin deficiencies, thalassemia, or sickle cell anemia. Usually iron-deficiency anemia is diagnosed by a routine blood count test.