Questions About PD
Weighing the bag before and after an exchange is generally not necessary in routine clinical practice. Each CAPD bag has a small “overfill” – a larger volume than on the bag. This is done to allow for “flush-before-fill”. Hence, it is safe to assume that a 2000 ml bag is about 2000 ml. The weight of the bag itself, and the tubing is small and the magnitude of error is not large enough for it to be clinically relevant. It is sufficient to weigh the drain bag and subtract the stated weight on the bag to obtain the ultrafiltration volume for that given exchange.