<prompt> How long can blood be stored with CPD-A -21 days28 days35 days42 days  <response>: blood can be stored only 21 days with CPD Where as when adenine is added to CPD , it can be stored for 35 days citrate phosphate dextrose adenine CPDA-1 an anticoagulant solution, containing citric acid, sodium citrate, monobasic sodium phosphate, dextrose, and adenine, used for the preservation of whole blood and red blood cells for up to 35 days; it extends red cell survival by providing adenine needed for the maintenance Refer robbins 9e pg 450 