Complete blood count

Reticulocyte count

Serum concentration of lactate dehydrogenase (LDH), bilirubin (total and direct fractions), and haptoglobin

Flow cytometric analysis of erythrocytes and granulocytes for expression of GPI-AP

Serum iron studies (iron concentration, total iron binding capacity, transferrin saturation index, and ferritin concentration)

Serum concentration of blood urea nitrogen and creatinine

Serum erythropoietin concentration

Urine hemosiderin*