Background:The kidney is the most likely to be affected by endothelial injury in patients with preeclampsia, so assessment of renal function is essential in the evaluation of the pregnant women with preeclampsia. Aim of the study: to evaluate which test of renal function in preeclamptic patients with and without intrauterine growth restriction is more useful. Patients and method:150 women in third trimester with preeclampsia over period of 14 months diagnosed based on measurement of blood pressure and presence of proteinuria divided into two group : group A those preeclamptic women without feature of intrauterine growth restriction by ultrasound and Doppler study and group B those with features of intrauterine growth restriction. Blood aspirated from each woman and blood urea, serum creatinine, serum uric acid, and serum cystatin-C were measured using spectrophotometer. Results: From 150 women with preeclampsia 120 of them had no features of intrauterine growth restriction and 30 had some features. Mean maternal age of patients included was 22±0.3 in group A and 24±0.7 in group B which is not differ statistically while the body mass index should statistically differences between the two group with P value <0.001. the blood urea, serum creatinine and serum uric acid levels found to be higher in group B but not reach statistical differences while serum cystatin C are higher in group B mean 1.23±0.45when compared to group A 1.08±0.97with p value <0.001. Conclusion:Renal function may be affected more in patients with intrauterine growth restriction and cystatin C level is more promising marker for renal function in preeeclamptic women.