What happens to the donated blood in bank after 40 days?

After 40 days, donated blood in a blood bank is no longer considered viable for transfusion and is discarded. This is due to the fact that red blood cells, the main component of donated blood, have a lifespan of approximately 42 days. As they age, red blood cells become less effective at carrying oxygen and can also break down, releasing harmful substances into the bloodstream.

Blood banks strictly adhere to these guidelines to ensure the safety and quality of the blood products they provide to patients. It is important to note that depending on the specific storage conditions and regulations in different countries or regions, the shelf life of donated blood may vary slightly, but it generally ranges from 35 to 42 days.