Arterial ammonia level (in patients with stage 2 or greater hepatic encephalopathy)
Viral hepatitis serologies: Hepatitis B surface antigen (hepatitis delta immunoglobulin (Ig)G if the surface antigen is positive), Hepatitis B core IgM, Hepatitis A IgM, Hepatitis E IgG (if positive, ribonucleic acid testing should be ordered in select patients), Hepatitis C antibody