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To the Editor.—I am puzzled by the use of the word "allotransfusion" in the article "Hematologic Integrity After Intraoperative Allotransfusion" by Drs. Aaron, Beazley, and Riggle (Arch Surg 108:831, 1974). Should not the prefixes auto- and allo- be used in reference to blood as they are used in reference to grafted tissue where auto- means tissue grafted from the recipient to himself and where allomeans tissue grafted from another human being to the recipient? If so, "intraoperative autotransfusion" would seem preferable.