Utility of hilson's perfusion index in the evaluation of suspected acute tubular necrosis

Dynamic renal scintigraphy scores above other methods for evaluating grafts as it can demonstrate perfusion, function, and drainage pattern. A difficult scenario in evaluating delayed graft function is excluding rejection. Perfusion indices help in the diagnosis of delayed graft function and ruling out rejection. We report a case of renal transplant recipient presenting with delayed graft function. Renal scintigraphy was performed 2-day posttransplantation. Time-activity curves were obtained for 1st min images to evaluate the perfusion of graft and iliac artery. Normal perfusion index is considered as below 150. The results were suggestive of maintained perfusion, more in favor of acute tubular necrosis. Hilson's perfusion index with appropriate modifications interpretation can rule out rejection.