Table 2.

The kidneys and the urinary tract change during the gestational age

US findings	Time at presentation
	16–27 weeks	≥ 28 weeks	Postnatal (> 48 h)
Anterior-PosteriorRenalPelvicDiameter (APDPD)	< 4 mm	< 7 mm	< 10 mm
Cayiceale dilation
Central	No	No	No
Peripheral	No	No	No
Parenchima
Thickness	Normal	Normal	Normal
Appearance	Normal	Normal	Normal
Ureter	Normal	Normal	Normal
Bladder	Normal	Normal	Normal
UnexplainedOligohydramnios	No	No	No

This table shows the threshold values considered normal according to the gestational age