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The Society of Fetal Ultrasound has developed a grading system for hydronephrosis, initially intended for use in neonatal and infant hydronephrosis, but it is now used for grading hydronephrosis in adults as well:<ref>{{cite web|url=https://www.uptodate.com/contents/overview-of-fetal-hydronephrosis|title=Overview of fetal hydronephrosis. Version Version 29.0|author=Laurence S Baskin|website=[[UpToDate]]|accessdate=2017-04-25}} Last updated Apr 20, 2017</ref>
* Grade 0 – No renal pelvis dilation. Cutoff values for different patient populations are:
:*Fetuses: An anteroposterior diameter of less than 4 mm in fetuses up to 32 weeks of gestational age and 7 mm afterwards.<ref name="D'Addario2014">[https://books.google.com/books?id=2PwlBgAAQBAJ&pg=PA189 Page 189] in: {{cite book|title=Donald School Basic Textbook of Ultrasound in Obstetrics & Gynecology|author=V. D'Addario|publisher=JP Medical Ltd|year=2014|isbn=9789351523376}}</ref>
