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Subject Area

Obstetrics and Gynecology

Article Type

Original Study

Abstract

Objective The aim of this work was to evaluate the accuracy of fetal kidney length (FKL) to estimate gestational age (GA) and its correlation with the established parameters in the late second and third trimesters of pregnancy. Background Determination of GA is a mainstay to enable the obstetrician to provide successful management of to provide the patient with successful management. The FKL has exhibited a steady increase during pregnancy and it is not affected by abnormalities of growth. Patients and methods This was a cross-sectional study that was conducted on 400 pregnant women during their 24–40 weeks of pregnancy. Patients were examined by transabdominal ultrasound. The fetal biparietal diameter, femur length, abdominal circumference, and transcerebellar diameters were measured using the standard techniques. FKL s were measured. Results The right kidney length ranged from 24.1 to 40.4 mm with a mean of 34 ± 4.2 mm, and the left kidney length ranged from 24.3 to 42.5 mm, with a mean of 34.3 ± 4.1 mm. A gradual increase in the length according to each gestational week was evident. The constructed histograms showed a rather normal distribution. Statistically highly significant correlations were found between the GA and the kidney length as well as the other established parameters. FKL was able to predict the GA with a highly statistically significant difference (P < 0.001). Conclusion The renal length of the fetus can be an additional tool to determine the GA when menstrual dates are uncertain.

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