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Background&Objective: Preeclampsia is a common complication of pregnancy it’s a bout 5-7 percent in pregnants and it may complicate mother or fetus which ends with death. The purpose of this study was to determine the value of the protein / creatinine ratio in prediction of 24-hour urine total among women with suspected preeclampsia. Materials&Methods: 150 women who were evaluated for suspected preeclampsia at ?20 weeks of gestation were studied prospectively in Az-zahra and Emam hospital Sari. There was no concurrent or preexisting systemic disease. They were undergoing a 24-hour urine collection for the determination of proteinuria. A single voided urine specimen was obtained after completion of the 24-hour urine collection and analyzed for the P/C ratio. Results: The randome urinary protein to creatinine ratios is strongly associated with the 24-hour total protein excretion (P<0.05, r = 0.37). The best cut off of 0.175 yieldes a sensitivity of 85.9% and a specificity of 66%. Conclusion: The random urinary protein to creatinine ratio could replace the 24-hour urine collection as a simple, faster more useful method for the diagnosis of significant protenuria.