Algorithm for clinical evaluation of microangiopathy in pregnancy. ADAMTS13; BUN, blood urea nitrogen; CBC, complete blood count; C-TMA, complement-mediated thrombotic microangiopathy; LDH, lactate dehydrogenase; PE, preeclampsia; PT, prothrombin time; PTT, activated partial thromboplastin time; TMA, thrombotic microangiopathy. *Occasionally severe renal failure occurs with HELLP, but the recovery is typically more rapid than in C-TMA.