Red blood cell labelling by intravenous injection of 99mTc-PAEP

In vivo red blood cell (RBC) labelling after the intravenous administration of PAEP (N- phosphorylamino -ethyl -phosphate) and the subsequent injection of sodium pertechnetate 24 hrs later was studied. The results in rats were found to be similar to those obtained after i.v. administration of 99mTc -PYP, a radiopharmaceutical routinely used for in vivo RBC labelling.