First of all we've to check for serum iron studies, vitB12, folate deficiency, rule out chronic inflammation, adequacy of dialysis, type of erythrpoitin using, proper storage, proper site of injection,
Next Steps
coomb's test, serum bilirubin, blood indices, peripheral smear, reticulocyte index, bone marrow examination, erythrpoitin antibodies and lastly parvo virus B19 blood PCR and IgG and lgM antibodies