The β2 microglobulin (β2 m) value in blood of these two arms were compared with each other to see whether the high flux membrane was better than the low flux regarding the elimination of this globulin Results: The level of blood β2 m in both groups were higher than normal with lower value in the HF group compared with the LF group (26631.460 ± 7511.38 µg / L vs 51580.11 ± 18811.09 µg / L, P < 0.01).