Our study suggests that the Society for Fetal Urology grading system has good intrarater but modest interrater reliability. Individual rater interpretations of the grading system may explain the modest interrater agreement. Proposed modifications to the Society for Fetal Urology classification system, such as distinguishing between diffuse and segmental cortical thinning, may improve reliability.

Only cystatin C served as a suitable marker to estimate glomerular filtration rate in patients with spina bifida. Cystatin C proved to be a superior marker in patients with spina bifida. In the control group the Schwartz formula was comparable to cystatin C and beta-trace protein, although cystatin C remained superior.

Recurrent ureteropelvic junction obstruction is unlikely after unobstructed postoperative diuretic renogram and does not warrant long term followup. Ideal followup would extend to 2 years, covering the period when an initial symptom of recurrence is most likely to present and enabling baseline unobstructed renal ultrasound to be performed.