Hepatitis A Total Antibody

What is Hepatitis A Total Antibody?

Measures total antibodies (IgM and IgG) against hepatitis A virus, indicating either recent infection or past infection/vaccination-based immunity.

This test measures total antibodies against hepatitis A virus, a virus spread mainly through contaminated food or water that primarily affects the liver. It relates to the digestive and immune systems, since hepatitis A causes liver inflammation that can bring on symptoms such as fatigue, nausea, or jaundice. Clinicians commonly order it to check immunity status before travel to areas where hepatitis A is common, to evaluate unexplained liver-related symptoms, or to confirm response to vaccination. Because this test detects total antibody (both IgM, which suggests recent infection, and IgG, which suggests past infection or vaccination-based immunity), separate IgM testing may be used when a current infection is specifically being considered.

Tests often checked alongside this

• Liver function tests (ALT, AST, bilirubin) — help assess liver involvement during active infection
• Hepatitis B and Hepatitis C markers — often checked together when evaluating liver health or travel-related risk

How this can show up in how you look and feel

• May be associated with fatigue, nausea, or loss of appetite during active infection
• May be associated with jaundice (yellowing of the skin or eyes) during active infection
• May be associated with abdominal discomfort in the area of the liver

What can affect this marker

• Vaccination history, which can produce a positive result independent of natural infection
• Timing of exposure relative to testing
• Travel history to areas with higher hepatitis A prevalence
• Lab-to-lab variability in assay methods

What to track over time

• Whether this result reflects vaccination-based immunity or past natural infection, when distinguishable
• Liver function trends if there is any current or recent infection
• Whether additional hepatitis A vaccination is needed before travel, as discussed with a healthcare professional

What to ask your doctor

• Does this result reflect immunity from vaccination or from past infection?
• Am I protected against hepatitis A for upcoming travel?
• Should my liver function be checked given this result?
• Is vaccination recommended for me going forward?

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