A unit of packed cells is split into two aliquots under closed sterile conditions. What is the expiration time for each aliquot?

When a unit of packed red blood cells is split into aliquots under closed sterile conditions, the expiration time for each aliquot remains the same as that of the original unit. This is because the aliquots are still considered part of the original unit and have not been manipulated in a way that would change their shelf life.

The original expiration date is typically determined based on the storage conditions and additive solution used, which is applicable to the entire unit. Therefore, as long as the aliquots are stored properly and remain in sterile conditions, they can be used until the original expiration date of the unsplit unit. This maintains the integrity of the blood components and ensures patient safety, aligning with best practices in blood banking regarding the handling and storage of blood products.