Why is then blood is preserved in blood bank for only 35 days?
Donated blood contains cells ranging from 1 to 120 days’ life span. Naturally, cells having such varied life spans cannot be preserved for 120 days in the bag since in that case there will only be a few living cells Present. In order to get a considerable number of living cells present in the blood for transfusion, 35 days shelf life has been found to be optimum with CPDA and CPDA1 solution on the basis of various experiments. Furthermore, cells which can remain alive for 120 days within the human body cannot survive for such period in an artificial environment.
