Results of In Vivo Studies Dialysate Pump Error (all pumps): ä Range: -6.8 +0.5% (-34.3 +4.7 ml/hr) ä Mean: -4.0% Ultrafiltrate Pump Error (all pumps): ä Range: -1.5 +7.4% (-13.7 +16.2 ml/hr) ä Mean: +0.9% Cumulative Pump Error (all pumps): ä Range: -7.9 +0.9% (-48.5 +9 ml/hr) ä Mean: -5.2%