passages.id: split_4_test_150_passage
passages.type: progene_text
passages.text: We demonstrated that the mean hematocrit significantly increased from 25.1 +/- 0.9 % to 31 + / - 1.2 % after eight weeks of intravenous ascorbate therapy ( 300 mg three times a week ) in 12 hemodialysis patients with serum ferritin levels of more than 500 microg / liter .