How To Hydrate Quickly For Blood Draw. After you’re finished, eat a hearty breakfast and full lunch to restore energy. Alternate arms if you’ve given blood recently.
An area of more than 8,000 feet (2,438.4 m) above sea level is considered to have ”thinner oxygen. people living in these areas generally have high hematocrit. Areas with high elevation have a lower oxygen concentration than areas with lower elevation.
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Avoid taking iron supplements for at least 24 hours before the blood draw. Be super hydrated and take a really warm shower as close as possible to the time that you’ll be donating blood.