Hepatitis A IgM antibody (anti-HAV IgM)

What it measures

Detects IgM antibody to hepatitis A virus, confirming recent infection in a patient with acute hepatitis. HAV spreads by the faecal–oral route.

Specimen and preparation

• Specimen: Serum or plasma
• Tube: Gold top

Reference range

Reference ranges differ between laboratories, methods and populations. Always use the range printed on your own lab report.

Causes of high values

• Acute hepatitis A (positive from symptom onset for about 3–6 months)
• Recent HAV vaccination (occasionally)
• Outbreaks linked to contaminated food or water

Method

CLIA or ELISA; rapid cards

Good to know

Total anti-HAV (IgG) indicates immunity from past infection or vaccination.

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