Although preeclampsia is presently identified only by maternal history and blood pressure by systolic or diastolic reading alone, and by uterine artery Doppler testing in the second trimester and clinical symptoms in Mongolian practice, this study initially used PAPP-A, PlGF, MAP and uterine artery Doppler testing, particularly using the mean pulsatility index for screening of preeclampsia in the first trimester. Here, PAPPA is linked to preeclampsia.