Aeromedical factorsQuestion 874 of 934

A pilot donates blood. Why should the pilot be careful about flying soon after?

  1. Blood donation raises the blood pressure for about a day
  2. Blood donation removes the pilot's night vision
  3. Blood volume can take several weeks to return to normal
  4. Blood donation causes motion sickness
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Correct answer: Blood volume can take several weeks to return to normal

Loss of blood from a donation can cause hypemic hypoxia, and the effects are risky when flying.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 17: Aeromedical Factors — Hypoxia, page 425

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Questions last reviewed: 18 October 2026