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Objective: To investigate any variability in fetal renal arteries Doppler indices between right and left sides, proximal and distal site. Study design Prospective observational study conducted on 150 pregnant women . Renal artery velocity waveforms were measured in both the right and left sides proximally and distally. Results: The mean PSV was significantly higher at right proximal site (69.141± 7.6352 vs. 64.064± 5.0714) and at left distal site (62.261 ±4.9222 vs. 59.841 ±4.7978) , the mean EDV was significantly higher at right proximal (5.730± 1.2253 vs. 5.257 ±1.1096 )and distal sites(5.27 ±1.265 vs. 4.089 ±0.8099), The mean PI was significantly higher at right proximal site (2.3840.2863± vs. 2.170 ±0.1953)but, distal to the aorta, it was higher on the left side (2.455± 0.2079 vs. 2.075± 0.1928) (P value <0.001). There is no correlation between the right and left sides. The mean PSV is significantly higher on the right side (64.4914.4203± vs. 63.1633.7369±), the mean EDV is significantly higher on the right side(5.500± 0.8399 vs. 4.673± 0.7150), the mean RI is higher on the left side (0.926± 0.0122 vs. 0.914 ±0.0154), while the mean PI is also significantly higher on the left side (2.419± 0.1764 vs. 2.122± 0.1324). Conclusion: Renal artery Doppler measurement at a given site cannot be used to predict its opposite.

Comparartive Study on Fetal Renal Artery Doppler Waveforms Between Right and Left Sides, At Proximal And Distal Sites Study