Medicine: Mixed Blood

Over two years ago Dr. Arthur G. Schroeder operated on Mrs. Leota Hayden in Chicago's Ravenswood Hospital. After the operation Mrs. Hayden needed a blood transfusion. She had Type IV blood; therefore the donor's blood had to be of the same type. Transfusions of Types I, II, or III blood would clot in her serum, block her circulation.

Dr. Schroeder had tested Mrs. Hayden's brother-in-law, George Mohr, and knew that he had Type IV blood. George Mohr was waiting in the reception room. "Bring in the donor," called Dr. Schroeder to a nurse....

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