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National Kidney and Transplant Institute It takes the body 24 - 48 hours to replace the plasma portion that is about 80% water and 3 - 5 weeks to replace the red cells. Donors are encouraged to drink plenty of non-alcoholic fluid before and following the donation to assist the replacement process. Also, regular and frequent donors should eat plenty of iron-containing foods (ex. meat).

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15y ago
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15y ago

It takes the body 24 - 48 hours to replace the plasma portion that is about 80% water and 3 - 5 weeks to replace the red cells. Donors are encouraged to drink plenty of non-alcoholic fluid before and following the donation to assist the replacement process. Also, regular and frequent donors should eat plenty of iron-containing foods (ex. meat). It takes the body 24 - 48 hours to replace the plasma portion that is about 80% water and 3 - 5 weeks to replace the red cells. Donors are encouraged to drink plenty of non-alcoholic fluid before and following the donation to assist the replacement process. Also, regular and frequent donors should eat plenty of iron-containing foods (ex. meat).

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13y ago

It takes somewhere between 90 and 120 days to replace a unit of blood.

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13y ago

I don't really know i think about... 1 hour but if you lose a lot of blood you can die .

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11y ago

72 hours

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Q: How fast is body replacing lost blood?
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