Diagnosis is often difficult because aHUS shares similar clinical features to other syndromes triggered by pregnancy, including ADAMTS13 (a disintegrin and metalloproteinase with a thrombospondin type 1 motif, member 13) deficiency-associated thrombotic thrombocytopenic purpura (TTP), pre-eclampsia, and HELLP (hemolysis, elevated liver enzymes and low platelets) syndrome [1]. The gene discussed is ADAMTS13; the disease is thrombotic thrombocytopenic purpura.