دور طول الكلية عند الجنين المقاس بالأمواج فوق الصوتية كمشعر في تقدير العمر الحملي مقارنة مع المشعرات الصدوية الأخرى في الثلث الثالث من الحمل

Abstract EN

Background & Aim : Determination of gestational age by ultrasound is not accurate after 34 weeks of gestation, and it has standard deviation of ±2 weeks.

Therfore, a new ultrasound parameter should be usedlthough, there are other ultrasound parameters which are considered inaccurate in the third trimester of pregnancy.

Materials & Methods : A prospective cross-sectional study was carried out in the Obstetrics and Gynecology University Hospital in Damascus between august 2018 and February 2021.

The study involved 400 pregnant women with singleton pregnancies having no complications between 28 and 41 weeks of gestation.

Biparietal diameter, femur length, abdominal circumference, head circumference and kidney length were measured by ultrasound.

The study was divided into three subgroups : the first subgroup (28-32 weeks), the second subgroup (33-37 weeks) and the third subgroup (38-41 weeks).

Statistical relationship and correlation coefficient were studied between each of these parameters with gestational age which derived from last menstrual period in the three subgroups.

Results : There is significant statistical correlation (P=0.001) and strong one (R=0.873) between fetal kidney length and gestational age which derived from last menstrual period in the third trimester.

Accuracy of fetal kidney length as a parameter increases with progressing in gestational age in comparision with other ultrasound parameters in which accuracy decreases with progressing in gestational age, especially in the second subgroup between 33-37 weeks (R=0.825) and the third subgroup between 38-41 weeks (R=0.897( Conclusions : The study recommended using the fetal kidney length as an independent parameter in estimating gestational age after gestational week 33.