Abstract: A medical analysis system for measuring properties and constituents of urine. The system includes a toilet unit mountable on a toilet bowl, readily attachable and detachable therefrom. The toilet unit includes a collection and sampling sub-unit for collecting and measuring the characteristics of urine and an electronics sub-unit for data collection and processing of the measured characteristics. The toilet unit also includes a communications link for data transfer between the collection and sampling and electronics sub-units. It also includes a means for removably fastening the collection and sampling sub-unit inside a toilet bowl, permitting ready attachment and removal of the toilet unit from a toilet bowl as desired. A wall unit, having a communications link for data transfer between the wall and toilet units, also includes means for storing and further processing the data for determining if changes have occurred in the measured characteristics of urine over time.