The invention relates to a method of detecting early rejection of an allograft in a mammal by administering to the mammal a diagnostically effective amount of detectably labeled immunoglobulin or fragment thereof, wherein the immunoglobulin substantially accumulates at the site of allograft rejection. The method of the invention may also be used to monitor allograft rejection during immunosuppressive therapy in a mammal which has received an allograft or to localize areas involved in autoimmune disease or inflammation.
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