What is the refrigerated shelf life of red blood cells?

• A. 60 days refrigerated
• B. 35-42 days refrigerated
• C. 21 days refrigerated
• D. 14 days refrigerated

Answer: (B)

How long refrigerated red blood cells stay usable. Red blood cells are kept at 1–6°C in preservative solutions that extend their viability. With modern additive solutions, these cells can be stored up to about 42 days, and guidelines commonly describe a practical range of roughly 35–42 days depending on the preservative system and regulatory approvals. As time passes, the cells undergo changes such as decreased 2,3-DPG and ATP, altered membrane properties, and increased hemolysis risk, which reduce their functional oxygen-carrying capacity even though they may still be physically intact. That combination defines why the refrigerated shelf life sits in the 35–42 day window. The other options fall outside this standard: 60 days is beyond approved storage limits, while 21 or 14 days are shorter than the typical refrigerated shelf life for units stored with contemporary additive solutions.