Razi Journal of Medical Sciences

The aim of the present study was to evaluate the correlation between gestational age and the length of fetal’s kidney in order to be able to have access to the size of the fetal’s kidney at any age. This assessment is helpful to diagnose the anomalies of the fetal’s kidney and makes it possible to consider the length of the fetal’s kidney as a biometric criterion to estimate the age of pregnancy. In order to substantiate this, the length of the fetal’s kidney in 138 normal pregnancies which were between 20 to 40 weeks old was gauged. Scrutinizing the information made it clear that there was a direct and signficant relationship between the age of pregnancy and the length of fetal’s kidney (r=0.95, P<0.001). In this study the average length changes spectrum of the fetal’s kidney was calculated according to any age at the second half of pregnancy. The fetal age was approximately estimated according to the length of the fetal’s kidney. However, the exact spectrum of the changes of the fetal age could not be achieved in this study therefore, more comprehesive and fully directed studies are needed.