diagnosing is a rational process based upon the use of the nursing process. nursing diagnoses are based on the patient's responses to a medical disease/condition. following the first step of the nursing process, look up the signs and symptoms of iron deficiency, folic acid deficiency, sickle cell hemoglobinopathy, and thalassemia. based on those signs and symptoms you choose nursing diagnoses that have defining characteristics (signs and symptoms) that match with the signs and symptoms of these diseases. to help, check the disease cross-reference in a place like the appendix of taber's cyclopedic medical dictionary. there is also a disease cross reference in the front of betty j. ackley and gail b. ladwig's nursing diagnosis handbook: a guide to planning care. perhaps you could look at a fellow student's copy for a few minutes for some diagnostic ideas if you do not either of these books.