Urea sensors--a world of possibilities

The arrival on the market of several monitors for the on-line measurement of urea has opened up a new range of possibilities. Already established dose measurements can be performed more easily, and a number of new parameters can be calculated. In this paper, different technologies for urea measurements are first discussed. Devices available on the market are then described according to the technology that is used and the parameters that are calculated. Finally, to show the versatility of this new possibility, a number of additional parameters are discussed that can be determined from dialysate side measurements of urea.