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The Diagnostic Maze: Challenges in Autoimmune Hepatitis Lab Interpretation.
Tina C L Phan1, Esther Blondeau-Lecomte2, Christopher D Jackson3
1Department of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Journal of Community Hospital Internal Medicine Perspectives
|August 4, 2025
Summary
Diagnosing autoimmune hepatitis (AIH) can be challenging, especially when patients receive intravenous immunoglobulin (IVIG). This case highlights how IVIG can complicate AIH diagnosis, emphasizing a thorough approach.
Area of Science:
- Hepatology
- Immunology
- Internal Medicine
Background:
- Autoimmune hepatitis (AIH) is a chronic liver inflammation diagnosed by autoantibodies, often anti-smooth muscle antibody (ASMA).
- AIH diagnosis is challenging, requiring exclusion of other liver diseases.
- Intravenous immunoglobulin (IVIG) therapy can influence autoimmune test results.
Observation:
- A 43-year-old female with myasthenia gravis on IVIG presented with elevated liver enzymes and mild ASMA.
- Liver biopsy showed severe acute hepatitis, initially suspected as drug-induced liver injury (DILI) from IVIG.
- Enzyme elevation persisted after IVIG cessation, suggesting AIH.
Findings:
- ASMA has only moderate sensitivity (59%) for AIH.
- IVIG can interfere with autoimmune antibody testing, potentially causing false negatives.
- This case underscores diagnostic complexities in AIH.
Implications:
- Accurate AIH diagnosis requires careful interpretation of serologies and clinical course.
- Clinicians must consider potential confounding factors like IVIG therapy.
- Avoiding premature diagnostic closure is crucial for complex cases.
