Solutions
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snance's post in Transfusion of DAT+ units safety? was marked as the answerA few references you might find of interest:
Management of Blood Donors and Blood Donations From Individuals Found to Have a Positive Direct Antiglobulin Test. Transfusion Medicine Reviews 2012. Volume 26, Issue 2, Pages 142-152,
Garratty G. The significance of IgG on red cell surface. Transfus Med Rev. 1987;1:47–57.
Petz LD, Garratty G. Immune Haemolytic Anaemias. 2nd ed. Philadelphia, PA: Churchill Livingstone; 2004.