Blood Donations

In a completely healthy individual, the fluid reduction caused by donating one unit of blood is replaced within several hours. In some people, however, the loss of blood causes disturbances to the circulation that may last for several days. While the effects at ground level are minimal, flying during this period may entail a risk.

Generally, active pilots should not donate blood, but if blood has been donated they should wait at least 48 hours before flying.

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