Renal GFR is estimated by

C i.e. Tc99 DTPA DTPA is freely filtered at globerulus with no tubular reabsorption or excretion. Thus its excretion rate measures GFRQ. DTPA Scan is useful for evaluation of perfusion and function of each kidneyQ. It is also indicated in Urinary tract obstructionQ, Renovascular cause of hypeensionQ and Renal transplant.Q DMSA scan is used to assess coical functions of kidneyQ and morphology Q (Structure) Mn = "S".