VORRICHTUNG ZUM MESSEN DER KONZENTRATION EINER VERBINDUNG MIT NIEDRIGEM MOLEKULARGEWICHT IN EINEM KOMPLEXEN MEDIUM, INSBESONDERE IN BLUT

An arrangement for measuring the concentration of a low-molecular compound in a complex medium, especially whole blood. The arrangement comprises means for the dialysis of the complex medium so as to form a dialyzate on which the measurement is to be carried out, possibly after previous passage of the dialyzate through an enzyme bed (37) for the enzymatic conversion of the low-molecular compound to a more readily measurable compound. The arrangement comprises moreover means for the feed and removal respectively of dialyzing solution and possibly further liquids useful for the measurement. The last mentioned means comprises a single container (1) common to the said liquids divided into at least two separate inner chambers (2, 3, 4, 5) which are provided with suitable connections (13, 16, 19, 22) to be connected to corresponding junctions (11, 14, 17, 20) on the arrangement. The container (1) is preferably manufactured from a flexible or readily foldable material, for example plastics, and is in the shape of a substantially rectangular bag with closed outer periphery and with the interior of the bag divided into the required number of chambers (2, 3, 4, 5) by appropriate welding (6, 7, 8). The bag (1) is preferably made of a transparent material.