Abstract
Doppler imaging is a non-invasive method in evaluating fetal circulation. Renal artery doppler (RAD) has been used for assessing fetal well-being in several studies. The aim of this narrative review was to accumulate and classify current evidence on RAD in fetal sonography. Articles until November 2022 were searched. After removing ineligible articles, 51 studies were included. Present articles were about RAD assessment in cases with amniotic fluid level changes, fetal growth restriction, fetal renal diseases, monochorionic twin pregnancies, preeclampsia, and gestational diabetes mellitus. The complex physiology of fetal kidney function may explain different results observed in different studies about the role of RAD in fetal assessment. It seems this factor can be useful in assessing some groups like diabetic pregnant women, and it should be used accompanying other related factors like kidney size. Further research is needed to evaluate the effectiveness of RAD in clinical management.
 Key words: Fetus, Fertilization in vitro, Prenatal ultrasonography, Thymus
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