LFTs
AST, ALT > 1000s
Elevated bilirubin
Elevated alk phophatase
Elevated INR
CBC, BMP
Assess for alternative etiologies of symptoms as appropriate (see: jaundice, RUQ pain, nausea/vomiting)
AST, ALT > 1000s
Elevated bilirubin
Elevated alk phophatase
Hepatitis B
Acetaminophen toxicity 
Hepatitis C
Viral hepatitis
Hepatitis D
Hepatitis A
Hepatitis E
Rubella