How long must a flight attendant wait to perform inflight duties after giving blood?

• A. 72 hours
• B. 24 hours
• C. 48 hours
• D. 7 days

Answer: (A)

After giving blood, your circulating blood volume drops and your heart has to work a bit harder to maintain blood flow. Flying adds extra stresses to your circulation: cabin pressure, lower humidity, possible dehydration, and the physical demands of inflight duties. Waiting a full 72 hours gives your body time to restore blood volume and stabilize your ability to handle those stresses, reducing the risk of dizziness, fainting, or fatigue during a flight. That safety buffer is why 72 hours is considered the best choice.

Shorter periods don’t provide as much time for recovery, and waiting a week is more than what most medical policies require.