Complete Blood Count, Ferritin, Folates (Folic Acid), Iron, Iron Binding Capacity, Reticulocyte count, Vitamin B12 This test is used to detect iron deficiency anemia, a condition in which there aren't enough healthy red blood cells to carry adequate oxygen to your tissues which can make you feel tired. Anemia is a common blood disorder. Women and people with chronic diseases are at increased risk of the condition.