I'm not entirely sure how it works either. The girls at the donor center said that when they feed your info into the computer it decides if it take 1, 2, or 3 units. Lately I have been donating 3 units per visit. They tell me when to donate whole blood because my iron will get too high for platelets A whole blood donation drops the iron count for a while. I just do what they tell me, they are great.
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