have they done a PET test for u? this will tell them the best way to setup ur machine... right now ur prolly just doing a general prescription. after they do the test they will know how it takes for ur body to start absorbing, and find out whether u are a high or slow transporter... u have to have a new whenever something happens tht afffects ur peritoneum, such as infections, or whenever u first get a cath. i know im scheduled for one in a couple weeks bc i just got my cath functioning properly... takes about 4 hours total, but all they do is take a little fluid out at intervals