Renal images of 194 normal subjects given 99mTc-dimer captosuccinic acid (DMSA) were reviewed to establish normal values and optimal imaging techniques for this new renal agent. Images were consistently of high quality. Normal renal size (posterior length) averaged 11.5 .+-. 1 cm, and renal radioactivity (functioning tubular mass) was equally divided between the left and right kidney. 99mTc-DMSA appears to be an excellent renal parenchymal imaging agent.