We conclude from this study that there are significant differences in the Doppler indices at different sites over the artery. In general, the velocity of blood is faster near its origin while the resistance increases near the kidneys. The pulsatility index is the least to show changes at different sites and, thus, is the recommended index to take into consideration while evaluating the fetal renal blood flow. Latest ISUOG guidelines issued certain criteria for measuring the umbilical artery and middle cerebral artery Doppler. In turn, we find the need to set rules for measuring the fetal renal artery Doppler. Each sonographer must have his/her own policy in measuring the fetal renal artery Doppler as there are differences between right and left sides in the readings. We recommend using the right side (bearing in mind that PSV and EDV are slightly higher) either proximal or distal. When comparing proximal to distal, the PI did not change significantly. When comparing right and left sides, the PI was higher on the left side. Most of the disorders mentioned had a higher than normal PI value. So it seems reasonable to avoid the already high side (left) and to measure at the low side (right). When in doubt, we recommend taking the readings on both sides.