After giving blood, how many hours must pass before you may perform flight duties?

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Multiple Choice

After giving blood, how many hours must pass before you may perform flight duties?

After giving blood, you should wait 72 hours before performing flight duties to give your body time to restore normal blood volume and oxygen-carrying capacity. Donating blood reduces red blood cell mass and blood volume, and while plasma volume can rebound quickly, the red cell mass takes a few days to fully replace. In flight, you face factors like cabin altitude (which lowers available oxygen) and higher workload, which increase your body's demand for efficient oxygen transport. Permitting a 72-hour window helps reduce the risk of lightheadedness, fatigue, or impaired performance if you’re not yet back to your normal hematologic status. If you feel any dizziness or unusual fatigue, it’s prudent to delay flight duties even longer.

After giving blood, you should wait 72 hours before performing flight duties to give your body time to restore normal blood volume and oxygen-carrying capacity. Donating blood reduces red blood cell mass and blood volume, and while plasma volume can rebound quickly, the red cell mass takes a few days to fully replace. In flight, you face factors like cabin altitude (which lowers available oxygen) and higher workload, which increase your body's demand for efficient oxygen transport. Permitting a 72-hour window helps reduce the risk of lightheadedness, fatigue, or impaired performance if you’re not yet back to your normal hematologic status. If you feel any dizziness or unusual fatigue, it’s prudent to delay flight duties even longer.

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