) On chronic renal replacement therapy for less than three (3) months 2) Hospitalization for reasons other than vascular access complications in the past three (3) months 3) HIV + 4) Hepatitis B+ 5) Pregnancy, verified by pregnancy test for women of child bearing potential 6) Access recirculation > 10% 7) Hematocrit less than 26% 8) History of non compliance 9) Pediatric patients, defined as less than 18 years old