Every few weeks for six years, Michael McDermott drove up to an hour to Dedham, Mass., to donate blood platelets. He went to the Red Cross there because it was the only one in the area with the equipment required for the involved procedure--which takes two hours, about twice as long as ordinary blood donation. McDermott gave voluntarily, receiving no payment in return. On the lower right of his car's rear bumper, he pasted a sticker: GIVE BLOOD.
But last week McDermott chose to draw blood. The morning after Christmas, McDermott, 42, dressed in a plaid shirt and jeans, was chatting...