Abstract
A change from a paid to a volunteer blood donor system was instituted as recommended by the American Association of Blood Banks Statement on the National Blood Policy. The incidence of counterelectrophoresis HB s Ag positive units from each donor group was determined. Of 2,785 purchased units, 3 (0.10%) were HB s Ag positive, while 34 (0.94%) of 3,609 units from volunteers were HB s Ag positive. This 840% increase suggests that careful selection of donor population rather than blind reliance on volunteers should be emphasized in providing the safest blood for transfusion. ( JAMA 234:1051-1052, 1975)
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