The Antenatal Presentation (left column) is divided into normal, A1 and A2-3, and measurements between 16–27 weeks’ and ≥ 28 weeks’ gestation. A normal urinary tract is one with no urinary tract abnormalities and anterior posterior renal pelvic diameter (APRPD) measuring less than 4 mm between 16–27 weeks’ gestation and less than 7 mm ≥28 weeks’ gestation
A1 describes a normal urinary tract with 4 to <7 mm pelvic dilation at 16–27 weeks’ gestation or 7 to <10 mm ≥28 weeks’ gestation with or without central calyceal dilation. UTD A2-3 is for fetuses if there is APRPD ≥7 mm between 16–27 weeks’ gestation or ≥10 mm ≥28 weeks’ gestation, peripheral calyceal dilation, ureteral dilation, renal parenchymal or bladder abnormalities.
The Postnatal Presentation (right column) is divided into normal, P1, P2 and P3. Measurements are more reliable if taken 48 h after birth or later. A normal urinary tract is one with no urinary tract abnormalities and APRPD <10 mm. P1 describes a normal urinary tract with APRPD 10 to <15 mm and/or central calyceal dilation. P2 describes APRPD ≥15 mm or peripheral calyceal dilation. P3 describes additional ureteral dilation, abnormal renal echogenicity or cysts or bladder abnormalities regardless of APRPD measurement.
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