What is the annual blood donation frequency restriction?

• A. Twice per year
• B. Once per year
• C. Four times per year
• D. No limit

Answer: (A)

Frequent blood donation can lower your red blood cell mass and hemoglobin, reducing oxygen-carrying capacity. For aircrew, keeping enough circulating red cells is essential for safety and performance, so the policy limits donations to at most twice per year. This gives vital time for red blood cells to rebound between donations, reducing the risk of anemia during duty. Donating more often would increase that risk, while donating only once or having no limit would not align with aviation safety standards.