REHem-AR currently collects data from patients with rare anemias throughout Spain, including sickle cell disease (SCD), TM, thalassemia intermedia (TI), pyruvate kinase deficiency, glucose 6-phosphodehydrogenase deficiency (G6PD), congenital dyserythropoietic anemias, Blackfan-Diamond anemia, congenital sideroblastic anemias, hereditary xerocytosis, and other clinically significant anemias. Here, G6PD is linked to anemia.