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Blood test

Hepatitis A immunity

Hepatitis A immunity: what it measures, why a doctor orders it, how to prepare, and what a high or low result can mean - with private and NHS access routes in the UK.

Key facts

At a glance

  • What it measures: IgG antibodies to hepatitis A, showing protection from previous vaccination or infection.

  • Why it is ordered: before travel to higher-risk regions, and in people with chronic liver disease for whom hepatitis A would be more dangerous.

  • No fasting or special preparation is needed for this test on its own.

  • Reference ranges: the result reads immune or non-immune, and immunity after vaccination or infection is long-lasting. Every laboratory publishes its own interval, so the range printed on your report is the one that applies to you.

  • A raised result or immune result means no further vaccination is needed for that trip. A low result or non-immune result points to vaccination, which protects within a couple of weeks of the first dose.

  • Results usually take one to three working days, depending on the laboratory.

The full picture

What this test tells you, and how to get it

The hepatitis A immunity measures IgG antibodies to hepatitis A, showing protection from previous vaccination or infection. Doctors most often request it before travel to higher-risk regions, and in people with chronic liver disease for whom hepatitis A would be more dangerous. No fasting or special preparation is needed for this test on its own. The result reads immune or non-immune, and immunity after vaccination or infection is long-lasting, and reference intervals genuinely differ between laboratories, so no single number should be treated as a universal cut-off - your result is always read against the range printed on your own report. Broadly, a raised result or immune result means no further vaccination is needed for that trip, while a low result or non-immune result points to vaccination, which protects within a couple of weeks of the first dose, and either finding is interpreted alongside your symptoms, medication and other results rather than in isolation. Results usually take one to three working days, depending on the laboratory.

In the UK there are two routes to this test. Your NHS GP can arrange it free of charge when it is clinically indicated, though getting the appointment, the blood draw and the follow-up discussion can add days to weeks depending on local demand. Privately, the hepatitis A immunity can usually be booked within days - through a private GP, a walk-in phlebotomy clinic or a self-request home-testing service - and travel clinics often vaccinate on risk alone rather than testing first. A private result still deserves a clinician's interpretation: an isolated number without context is where most confusion about blood tests begins.

A quiet reminder

This guide is for information, not medical advice.

Your own clinician knows your history and can tell you which parts apply to you. Reference ranges vary between laboratories - always read your result against the interval printed on your own report. Next review of this page: 2027-09-27.

Frequently asked

Common questions about Hepatitis A immunity.

Quick, plain-English answers to what people ask us most.

  • What is a hepatitis A immunity test?

    This blood test checks whether you have protective antibodies against hepatitis A, either from previous infection or vaccination. It tells you whether you're already immune or might benefit from vaccination.

  • Why would a doctor order this test?

    It's commonly used before travel to areas where hepatitis A is more common, to check immunity status before or after vaccination, or if there's uncertainty about past vaccination history. It's also sometimes used in occupational health settings.

  • Do I need to prepare for this test?

    No special preparation, such as fasting, is needed for this test. Simply let the clinic know about any previous hepatitis A vaccinations or past infections if known.

  • What happens during the test?

    A standard blood sample is taken from a vein in your arm. The appointment itself typically takes just a few minutes.

  • Does it hurt or carry any risks?

    There's a brief needle prick and occasional minor bruising, with no other significant risks.

  • How long do results take?

    Results are usually available within a few days, and often faster at private travel clinics with in-house laboratories, which can be helpful if travel is imminent.

  • What do the results mean, and what happens next?

    A positive result means you have protective antibodies and are considered immune, whether from past infection or vaccination, while a negative result suggests you may benefit from vaccination, particularly before travel to higher-risk areas. Your doctor will advise based on your specific situation and travel plans.

  • How much does this test cost privately, and is it available on the NHS?

    It's available on the NHS in some circumstances, though travel-related testing and vaccination are often accessed through private travel clinics. Private testing is typically available quickly, sometimes with same-week vaccination if needed; cost varies by provider.

  • Is this test accurate and reliable?

    Antibody testing for hepatitis A immunity is well-established and reliable for confirming immune status. It gives a clear yes-or-no answer that's useful for travel and vaccination planning.

  • How do I book this test privately, and how quickly can I be seen?

    You can book directly with a private travel or GP clinic, often with results and any needed vaccination arranged within the same week, which is helpful if you're travelling soon.