ADAMTS13 and thrombotic microangiopathy: Several studies have linked PE and HELLP to dysregulated hemostasis and thrombotic microangiopathies (TMAs), which are characterized by elevated levels of the von Willebrand factor antigen (vWFAg) and reduced plasma activity of ADAMTS13 (a disintegrin and metalloproteinase with a thrombospondin type 1 motif, member 13) [2,6].