200 women at risk factor for preeclampsia will be subjected to transabdominal Doppler ultrasonography for assessment of placental volume measurements, pulasatility index (PI) and resistivity index (RI) in both uterine arteries, and assessment of the placental volume and its vascular indices (VI, FI, VFI)
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Development of preeclampsia
Timeframe: 28 to 38 weeks of gestational age