الفهرس 
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Abstract
This study include one hundred patients with suspected urinary obstruction underwent F+10min diuretic renography protocol. Forty of them gave no response to diuresis and diagnosed as obstructed kidneys, twenty patients showed delayed excretion but improved in response to diuresis and diagnosed as non-obstructed kidneys. The remaining forty patients showed equivocal response to diuresis. The remaning forty patients with equivocal response to diuresis underwent F-15 min diuretic renography with thirty one patients were proved to be obstructed and the other nine were non-obstructed. The Results obtained for one hundred patients by F+10 min protocol showed that forty were obstructed and twenty were non-obstructed with sensitivity 60% , however the remaning forty patients with equivocal response to diuresis underwent F-15 min diuretic renography with thirty one patients were proved to be obstructed and the other nine were non obstructed with sensitivity 100% for F-15min diuretic renography. Overall, Obstruction was found in 71 patients out of 100 patients with mean ± SD T½ values 31.39 min ± 10min. The mean kidney split function was 43.7 %± 2.6%. Twenty nine patients out of 100 patients were non obstructed with mean ± SD T½ values 9.76 min ±3.31 min and their mean kidney split function was 45.59%± 3.34%. Regarding to the forty patients with equivocal response to diuresis at F+10min; thirty one patients were proved to be obstructed by F-15min study with mean ± SD T½ values 29.77min±8min which was16.63 min±2.28 by F+10min(p=.000), however the other nine patients were proved to be non-obstructed with mean ± SD T½ values 12.89 min±3.22 mn in F-15 min study andit was 24.89±10.8 min in F+10 min (p=.01). In conclusion the optimum timing of diuretic injection is F-15 min prior to renography study for equivocal cases.F-15min renal scintigraphy can be considered as the most sensitive method for diagnosing urinary obstruction and non-obstruction so, it can be taken as a good standard method in this matter.