a clinical chemistry analyzer system for blood chemistry analysis is disclosed . two major parts comprise the system . one part is a discardable sensor cartridge which contains a bank of sensors , calibration fluid containers , conduit means and an external peristallically pumpable tube section . the other part is an analysis machine which interfaces with the discardable cartridge and has means to drive the peristaltic pump as well as means to interface with the sensors of the cartridge to provide a readout therefrom . the system is adapted to be made part of a heart / lung machine sustaining a patient in order to sample and monitor the venous and arterial blood flow thereof .