Collection of Dialysis Treatment Data and Patient-Related Information in a Single Dialysis UnitrnState-of-the-art dialysis machines are capable of automatically collecting huge volumes of dialysis treatment data (blood and dialysate flow rates, venous and arterial pressures, ultrafiltration rate, ultrafiltration volume, transmembrane pressure, conductivity, etc.) and displaying the information on the monitor screen. Commercially available software allows this information to be exported to a clinical database on a server through a local network in the clinic, enabling healthcare professionals to further process, display, and evaluate the data. Moreover, on-line sensors can be used to monitor patient-related information, e.g.effective ionic dialysance as a marker of urea clearance[1-3], urea removal and additional parameters(e.g. whole-body Kt/V) based on dialysate urea measurements[4,5], and blood volume changes[6]. Although many of these sensors are available in dialysis machines, their clinical value in routine dialysis is still subject to debate[7].rn