[A mathematical model for the decay of conserved blood]

In the present paper a simple model is presented by means of which a decay of stored blood can be predicted. The following factors are incorporated in the calculation: The relation of the depot stock to the average number of cross matchings per day, the probability of transfusions, the time reserved for crossed stored blood and that which is not transfused as well as the percentage of stored blood already reserved when arriving at the depot.