Extension From Weekly to Once Every Other Week Darbepoetin Alfa Administration in Subjects With Chronic Kidney Disease Receiving Dialysis

Inclusion Criteria: * Receiving dialysis for 3 months or more before enrollment. * The mean of 2 screening Hb values taken at least 7 days appart must be greater than or equal to 11g/dL and less than or equal to 13.0 g/dL * Receiving stable QW darbepoetin alfa doses for at least 6 weeks before enrollment * Adequate iron stores (serum ferritin equal to or greater than 100 ug/L Exclusion Criteria: * Uncontrolled hypertension * Prior history of Cardiovascular Incidents 12 weeks prior to enrollment * Other hematological disorders * Upper or lower GI bleed within the prior 6 months