What is the expiration time for Red Blood Cells in an open system?

The expiration time for Red Blood Cells (RBCs) in an open system is 24 hours. When RBCs are collected and stored in an open system, such as when the system has been breached to sample or test the blood, they are exposed to air and potential contamination, which can compromise their shelf life. The standard expiration time under these circumstances is 24 hours because after that time, the risk of bacterial growth and decreased viability of the RBCs significantly increases.

This is different from an enclosed system where RBCs can be stored for 42 days or longer under appropriate conditions without exposure to external factors. Therefore, the limitation of 24 hours in an open system is crucial for maintaining the safety and efficacy of the transfusion processes.