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Advances in Urology
Volume 2009, Article ID 960490, 4 pages
Research Article

Correlation of Hydronephrosis Index to Society of Fetal Urology Hydronephrosis Scale

1Department of Urology, School of Medicine, Wayne State University, Detroit, MI 48201, USA
2Department of Surgery, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503, USA
3Section of Urology, Sutter Memorial Hospital, Sacramento, CA, 95819, USA
4Pediatric Urology Medical Group, Inc., Santa Monica, CA, 90403, USA
5Department of Pediatric Urology, Helen DeVos Children’s Hospital, Grand Rapids, MI 49503, USA

Received 29 June 2008; Revised 3 November 2008; Accepted 16 December 2008

Academic Editor: Paddy Dewan

Copyright © 2009 Krishnan Venkatesan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose. We seek to correlate conventional hydronephrosis (HN) grade and hydronephrosis index (HI). Methods. We examined 1207 hydronephrotic kidneys by ultrasound. HN was classified by Society of Fetal Urology guidelines. HN was then gauged using HI, a reproducible, standardized, and dimensionless measurement of renal area. We then calculated average HI for each HN grade. Results. Comparing HI to standard SFU HN grade, average HI is 89.3 for grade I; average HI is 83.9 for grade II; average HI is 73.0 for grade III; average HI is 54.6 for SFU grade IV. Conclusions. HI correlates well with SFU HN grade. The HI serves as a quantitative measure of HN. HI can be used to track HN over time. Versus conventional grading, HI may be more sensitive in defining severe (grades III and IV) HN, and in indicating resolving, stable, or worsening HN, thus providing more information for clinical decision-making and HN management.