when their hypertension is caused by pheochromocytoma that may appear asymptomatic and may be fatal if the diagnosis can not be made before birth.
USG is useful to determine gestational age, fetal development and fetal heart rate. Any abnormality in Doppler assessment of uterine artery and fetal artery as well as the venous Doppler is useful as a predictor of preeclampsia development and perinatal outcomes.