Background: Diuresis renography was first used by O'Reilly in 1978 and then by other urologists and radiologists as the method of choice for evaluation the upper urinary tract. He studied the equivocal urinary tract obstruction patient's; he found that using diuretic renogram was preferred to evaluate the equivocal urinary tract obstruction of the patient. Several diuretic renography protocols were classified based on variation in the timing of diuretic administration relative to the radiopharmaceutical which called (T1/2). There are three items which Diuresis renography based on: the hydration state of patient, The optimal time to inject the furosemide, The role of the bladder. Objective: This study aims to assess the optimal timing of furosemide injection in diuretic renography in order to obtain the most accurate diagnosis.
Materials and methods: This study included 120 renal units (RU) were examined at Urology and Nephrology Center- Mansoura University from 2017 to 2020 by F+10 min diuretic renography protocol. Results: forty two (RU) of 120 (RU) haven't a response for diuresis and were diagnosed as obstructive kidneys. Fifty three (RU) revealed the excretion of kidneys were delayed but improved diuresis response and were diagnosed as non-obstructive kidneys, The remaining twenty five (RU) revealed as equivocal response after diuretic were done and underwent F-15 min protocol of diuretic renography