Normal Reference Ranges
Adult
Negative Qualitative
Pediatric
Negative Qualitative
Clinical Significance
Detects both IgG and IgM antibodies. Positive result indicates immunity from vaccination/past infection or acute infection (which requires HAV IgM to confirm).
Causes of High
- Prior Hepatitis A vaccination
- Past resolved HAV infection
- Acute HAV infection
Causes of Low
- No immunity or exposure to HAV