Abdomen
Kidney
Renal pelvis diameter <32 weeks
<4 mm
Ultrasound
Reference
Corteville JE, Gray DL, Crane JP. Congenital hydronephrosis: correlation of fetal ultrasonographic findings with infant outcome. Am. J. Obstet. Gynecol. 1991;165 (2): 384-8.
Pubmed ID: 1872344