It is also reasonable to order viral hepatitis tests (hepatitis A virus [HAV] IgM, hepatitis B surface antigen [HBsAg], hepatitis C virus [HCV] RNA, hepatitis E virus [HEV] IgM, and herpes simplex virus [HSV]) and consider an abdominal ultrasound with Doppler.35 This evidence concerns the gene CD40LG and viral hepatitis.