I’ve found it interesting, but not annoying, that the timers on the NxStage are not particularly accurate. When I go for a 4 hour session, the time at coming off is around 3hours 45 mins, due to difference between UF time and straight dialysis, and that makes sense, yet the physical time I am on dialysis is over 4 hours (by a separate clock).
As I am expecting to be on the machine for 4 hours this is not an big issue, but does raise the issue of accuracy of the rest of the machine. I suspect this is a minor issue about timers. However, it does tie in with the UF selected being exceeded by, in some case, half a kilo per session.
This has been raised on the NxStageUsers blog before now, and seems to be a common problem with many types of dialysis machines, as I have found this on the NxStage, Fresenius (various models), Braun and Gambro. I does require the user, especially if like me, you are on your own without a carer, to be extra vigilant not to dry out too much and become hypotensive.