Through laboratory testing, other etiologies such as TTP, Shiga-toxin-producing Escherichia coli HUS (STEC-HUS), and HELLP syndrome were ruled out based on negative ADAMTS13 activity, Shiga toxin testing, and the timing of symptom onset with the associated clinical presentation, respectively. The gene discussed is ADAMTS13; the disease is thrombotic thrombocytopenic purpura.