The Correlation Between Renal Injury and Biomarkers in Pediatric Ureteropelvic Junction Obstruction Patients

Inclusion Criteria: \<Group 1\> 1. 0-3 year old patients with SFU grade 2 or more hydronephrosis without ureteral dilatation 2. needs pyeloplasty due to differential renal function (DRF)\<40%, decreased DRF by more than 5%, development of urinary tract infection, development of urinary stone, and development of pain related with UPJO \<Group 2\> 1\. 0-3 year old patients with SFU grade 3 or 4 hydronephrosis without ureteral dilatation 2. doesn't meet the above criteria for the indication of pyeloplasty \<Group 3\> 1\. 0-3 year old children without any abnormality of urinary tract Exclusion Criteria: \<Group 1\> 1. patients with contralateral disease affecting DRF 2. history of previous urinary tract surgery 3. follow up loss before diuretic renogram performed at 6-12 months from operation \<Group 2, 3\> 1\. patients with contralateral disease affecting DRF 2. history of previous urinary tract surgery