Measuring the ratio of fetal renal longitudinal distance to biparietal diameter using ultrasonography and its clinical value

Abstract:

Objective：To discuss the proportional relation between fetal renal longitudinal distance（FRLD） and biparietal diameter（BPD） and its clinical value. Methods：FRLDs of fetus aged between 18 to 41 weeks were measured using uhrasonography and the ratios of FRLD to BPD（FRLD/BPD） were calculated. Results：FRLD/BPD of 600 cases was collected in total. The left kidney FRLD/BPD was 0.44±0.03 and the right kidney FRLD/BPD was 0.44±0.03（P >0.05）. There were 142 cases identified as renal anomaly during the same time. There were statistically significant differences in FRLD/BPD between polycystic kidney，polycystic renal dys－plasia and renal agenesis and normal kidney（P<0.05），with 95% referential FRLD/BPD being（0.38，0.5０）. Conclusions：FRLD/BPD value can be used as reliable index to judge renal development during middle and late pregnancy and can be used to discover renal anomaly at early phase so as to conduct clinical intervention and treatment.