The value of autologous indium (111In)-labelled platelets in the diagnosis of renal transplant rejection.

Serial pelvic imaging after injection of autologous platelets labelled with 111In was used to study 22 consecutive patients following cadaver renal transplantation. Increases in isotope uptake by the allografts were observed during episodes of acute rejection (12/22) but not during acute tubular necrosis (4/22). The technique was not influenced by oliguria or hemodialysis therapy. Extra-renal accumulations of labelled platelets were noted in perinephric hematomata and deep vein thromboses.