A new approach of Biosensor for Continuous Ambulatory Peritoneal Dialysis (CAPD) that works only when the waste in your abdomen is over the threshold -not throughout night time-. The solid state chemical/bio ISFET sensor, benefiting from advanced electronic circuit techniques, is now enjoying a revival after 37 years of staying in the shadows. However, this young species needed a lot of nurturing to ensure it reaches maturity and flourishes. Looking back over the work of this research and looking forward to future developments, the book elucidates mandatory steps that will enhance the chances of success of this biosensor, ISFET.