Ultrasonic determination of gestational age by assessment of fetal kidney size in the third trimester in southwest Nigeria.

Objective: To determine the strength of association between fetal kidney measurements and gestational age (GA) in third-trimester pregnancies.

Methods: In a cross-sectional study in Ile-Ife, Nigeria, women in the third trimester of a singleton pregnancy who were sure of the date of their last menstrual period or had an early pregnancy scan were recruited consecutively in 2012. Standard biometric measurements were taken, along with fetal kidney length (FKL), anteroposterior diameter (FKAPD), and transverse diameter (FKTD).