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Table 1 Society for Fetal Urology (SFU) grading system of congenital hydronephrosis based on longitudinal ultrasound scan of the kidneys

From: The role of routine post-natal abdominal ultrasound for newborns in a resource-poor setting: a longitudinal study

Grade Central renal complex Renal parenchymal thickness
0 Intact Normal
1 Urine in pelvis barely splits sinus Normal
2 Evident splitting of pelvis and major calyces Normal
3 Wide splitting of pelvis, major & minor calyces Normal
4 Further splitting of pelvis, major & minor calyces Reduced