PECAM1 and hypertensive disorder: This research aimed to determine the predictive value of a combined diagnosis of serum platelet endothelial cell adhesion molecule-1 (PECAM-1) and placental growth factor (PLGF) levels, gut microbiota count, and uterine artery Doppler ultrasonography in relation to pregnancy outcomes in patients with hypertensive disorders complicating pregnancy (HDCP).