Management of Suspected Infectious Mononucleosis with Hepatotoxicity

Clinical Presentation and Diagnosis

The American Academy of Pediatrics and the Infectious Diseases Society of America recommend that pharyngitis with lymphadenopathy is the hallmark presentation of EBV infection 1
The European Association for the Study of the Liver notes that mild hepatomegaly with rising LFTs occurs in approximately 80-90% of EBV cases, though severe hepatitis is uncommon 2
The American Association for the Study of Liver Diseases states that hyperbilirubinemia indicates hepatocellular injury that warrants immediate attention 3
The Centers for Disease Control and Prevention recommend that fever that "settled" on antibiotics may represent the natural course of viral illness rather than true antibiotic response 1

The American College of Gastroenterology recommends that children may experience elevated LFTs during viral infections, particularly when NSAIDs and antibiotics are administered concurrently 2
The National Institute of Diabetes and Digestive and Kidney Diseases advises that bilirubin ≥2× ULN with rising transaminases mandates immediate cessation of potentially hepatotoxic medications 3

The Infectious Diseases Society of America recommends EBV serology: Monospot test or EBV-specific antibodies (VCA-IgM, VCA-IgG, EBNA) 1
The American Association for Clinical Chemistry suggests a complete hepatic panel: ALT, AST, alkaline phosphatase, GGT, direct and indirect bilirubin to differentiate hepatocellular vs cholestatic injury 3
The College of American Pathologists recommends a complete blood count with differential: Look for atypical lymphocytes (>10% suggests EBV) 1
The American Association for the Study of Liver Diseases advises viral hepatitis serologies (HAV, HBV, HCV) if not previously done 4
The International Society on Thrombosis and Haemostasis recommends coagulation studies (INR) to assess synthetic liver function 3

The American Academy of Pediatrics recommends supportive care only for EBV infection: No specific antiviral therapy indicated 1
The Infectious Diseases Society of America advises avoiding ampicillin/amoxicillin: These cause a characteristic maculopapular rash in 80-100% of EBV patients 1
The European Association for the Study of the Liver recommends monitoring LFTs weekly until normalization for EBV infection 2
The American College of Sports Medicine suggests restricting contact sports for 3-4 weeks due to splenomegaly risk 1

The American Association for the Study of Liver Diseases recommends hepatology consultation for ALT or AST >5× baseline 3
The European Association for the Study of the Liver advises hepatology consultation for bilirubin continues rising beyond 4 mg/dL 3
The International Society on Thrombosis and Haemostasis recommends hepatology consultation for INR elevation suggesting synthetic dysfunction 3
The Society of Critical Care Medicine suggests hospital admission for clinical deterioration: Encephalopathy, coagulopathy, or worsening jaundice 5

The Infectious Diseases Society of America recommends not continuing antibiotics empirically without confirmed bacterial infection—this risks worsening DILI 2
The American Association for the Study of Liver Diseases advises not using the same LFT thresholds for patients with baseline abnormalities vs normal baseline 6
The American College of Gastroenterology recommends not delaying antibiotic cessation when DILI is suspected—each hour of delay increases mortality risk in severe cases 3
The Centers for Disease Control and Prevention suggest not assuming fever resolution on antibiotics proves bacterial etiology—viral illnesses follow their natural course regardless 1
The National Institute of Diabetes and Digestive and Kidney Diseases recommends not restarting hepatotoxic medications until LFTs return to <2× ULN and bilirubin normalizes 3