<s>[INST] I have a friend in the hospital that has a blood infection cause ?? has been in hospital for 2 weeks and was recovering slowly and just got a hemeglobin test of 6.1. He has had dialysis at least 3x but none this weekend.What would cause the drop in hemegobin? [/INST] Hello and welcome to Ask A Doctor Service.  I reviewed your query and here is my answer. As you said that he is on dialysis so most like the patient has got renal problems which means the patients kidneys are not functioning properly. Do ti which erythropoietin cannot be produced by damaged kidneys which are essential for erythropiosis. This may be the cause of low hemoglobin.  But the patients should be tested for other causes of anemia as well. Hope I answered your query. Ask more if u need further assistance.  Thanks. Regards. Chat Doctor. G.P </s>