Fluid reservoir for an apparatus for analysis of patient samples

Fluid reservoir for an apparatus (10) for analysis of patient samples, the apparatus has only a for a patient (12) useful diagnostic unit (30) which is equipped to accommodate at least one patient sample and sensors (37) for detecting measurement values ​​of the patient sample wherein in the fluid reservoir supply chambers (27) each for a sensor solution (27a) and at least one collection chamber (29) for consumed sensor solutions (27a) and analyzed patient samples is provided, characterized in that it comprises a flexible outer skin (84) and that the supply chambers (27) and the collection chamber (28) variable, inter-communicating volumes, which are arranged within the flexible outer skin (84), and that the supply chambers (27) and the collection chamber (28) through joint flexible walls (29) separated from each other are connected via communicating the collecting chamber (28) with the supply chambers (27).