Unclear Q, but...: Whole blood donation is every 56 days. A pheresis machine can collect 2 units of red blood cells at one time, returning other components--this can be done every 112 days (2x as long as single). Other pheresis donations can be for plasma or platelets, and they have much shorter interval periods (may be 3-7 days). Talk to the Red Cross for more information.
Answered 5/2/2021
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