• CBC• Electrolytes• Liver panel: total/direct bilirubin, AST, ALT, GGT, ALP albumin• PT/INR• AFP• HCC Surveillance (every 6 monthly if cirrhosis by biopsy/other noninvasive measures like imaging)• If BMI >95th percentile for children: lipid profile, glucose, insulin levels• Hepatitis serology once >10 y post-Fontan: hepatitis B surface antibody, hepatitis B surface antigen, hepatitis C antibody, hepatitis A antibody. Here, GPT is linked to hepatitis A virus infection.