Bubble mixing device for blood sampling by automatic analysis.

JHE RESULTS of blood glucose determinations and, to a lesser extent, of blood urea nitrogen determinations by an automatic analysis device* have been observed to be significantly lower than those of the commonly used routine methods (1, 2). A cause of these discrepancies was the gradually increasing sedimentation of cells in blood samples during an hour of processing, with resultant pick-up of blood suspensions progressively richer in cells and with lower glucose and urea nitrogen concentrations. This problem was solved by the use of a bubble mixing device that produces uniform blood suspensions.