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Free risk assessment

Do I Have Hepatitis B?

Hepatitis B is a vaccine-preventable liver infection spread through blood and bodily fluids, including sex. Answer a few questions about your symptoms and risk factors to see how concerned to be, when a test is reliable, and where to get tested. This is a guide, not a diagnosis.

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Take the test
People with chronic HBV in the U.S.
~640,000
CDC estimate, most unaware of their infection
Vaccine-preventable
Yes
Safe, highly effective 2- or 3-dose series; CDC-recommended for all adults
Chronic in adults
<5%
of adults who acquire HBV develop chronic infection; >90% of neonates do
Perinatal transmission risk
>90%
of infants born to HBsAg-positive mothers without prophylaxis become chronic

How it works

How this assessment works

  • Grounded in public-health guidance

    The questions, and how heavily each answer counts, follow the risk factors and symptoms the CDC and WHO describe for Hep B.

  • A risk guide, not a diagnosis

    Your answers produce a risk level, how concerned to be, and flag anything that needs urgent care. Only a lab test can confirm or rule out an infection.

  • Private by design

    It runs in your browser. We never ask for your name, email, or anything that identifies you.

About hepatitis B

What is hepatitis B?

Wondering if you might have hepatitis B? It's worth checking, because this is an infection that hides well. Hepatitis B is a virus that targets the liver, and most people carrying it long-term feel perfectly normal for years: symptoms, when they come at all, are easy to miss. Roughly 640,000 people in the U.S. live with chronic hepatitis B, and a large share have no idea.

Here's the reassuring side: a single blood draw settles the question, telling you whether you have an active infection, are already immune, or are still unprotected. Most healthy adults who catch it clear the virus on their own; for the smaller group who don't, daily medication keeps the liver safe. And it's the rare STI you can stop before it starts, a safe vaccine prevents it outright. This check weighs your answers to show how concerned to be; it doesn't replace that blood test.

Many infections are silent. A low result here doesn't rule hepatitis b out: if you've had a new partner or any concern, testing is the only way to be sure.

Screening guidance

Who should get tested for hepatitis B?

Because hepatitis B is often silent, the CDC recommends routine screening for the groups most likely to have it, not just people with symptoms.

  1. 1

    Every adult, at least once

    The CDC now suggests a one-time hepatitis B test for all adults, simply because chronic infection is so often silent, feeling fine tells you nothing.

  2. 2

    You were born where hepatitis B is common

    If you, or your parents, come from parts of Asia, sub-Saharan Africa or the Pacific Islands, your odds of a long-standing infection are higher: testing and, if needed, vaccination matter.

  3. 3

    You have ongoing exposure

    Condomless sex with new partners, injecting drugs, or living with or sleeping with someone who has hepatitis B all raise the risk and are clear reasons to test.

  4. 4

    You're pregnant

    A hepatitis B test is standard early in pregnancy: if it's positive, treatment at birth protects the baby from a lifelong infection.

Timing

When a hepatitis B test is reliable

The marker of active infection (HBsAg) can show up anywhere from 1 to 9 weeks after exposure, so a very early test can still read clear. Ask for the full hepatitis B panel: it reads active infection, past immunity and susceptibility in one draw. One important exception: if you think you were exposed within the last few days, don't wait to test: contact a provider straight away, because a preventive shot can stop the infection if given promptly.

Your hepatitis B testing window

After a possible exposure, a hepatitis B test becomes reliable around 3–6 weeks later.

Exposure Day 0 Earliest reliable Day 21 Conclusive Day 42

Before day 21 a test can miss it · from day 21 it's reliable · re-test after day 42 if you tested early.

Free tool · not a clinic

When can I test? Exposure-window calculator

Testing too soon can miss an infection. Enter the date of possible exposure to see the earliest a test can reliably detect each STI.

Full hepatitis B testing guide: cost, treatment & where to test

Stats & rates

Hepatitis B in the United States

An estimated 640,000 Americans live with chronic hepatitis B (CDC estimate; range 580,000–2.4 million). An estimated 13,300 new acute infections occurred in 2021. Approximately 1,800 deaths per year are attributable to HBV-related liver disease. Chronic HBV disproportionately affects people born in or descended from HBV-endemic regions, an estimated 69% of those living with chronic HBV in the U.S. are non-U.S.-born, predominantly from Asia and Africa. People who inject drugs and unvaccinated MSM account for a rising share of new acute infections.

4 /100k
Estimated acute HBV incidence per 100,000 (CDC 2021) (2023)
640k
People living with chronic HBV in the U.S. (CDC est.) (2023)
~640,000
Americans living with chronic hepatitis B, most undiagnosed

Medically Reviewed · Updated

Reviewed by Mark Riegel, MD · Sexual Health Physician · Chief Medical Reviewer

Physician focused on sexual health, STI testing, treatment and prevention, and EasySTD's chief medical reviewer. Owns the condition guides and is the clinical backstop for any page without a more specific specialist. Our editorial guidelines →

10 Sources

Clinical guidance

Data & references

Peer-reviewed literature

Good to Know

Hepatitis B FAQs

What people ask most before testing for hepatitis b.

Does hepatitis B have symptoms?

Often none, especially in chronic infection, many people feel fine for years. When symptoms occur they include fatigue, nausea, abdominal pain, and jaundice. Because it can be silent, testing is the only reliable way to know.

How is hepatitis B spread?

Through blood and body fluids: condomless sex, shared needles or personal items, and from parent to baby at birth. It's much more infectious than HIV through these routes.

Should I get tested if I feel fine?

Yes: the CDC now recommends every adult get tested for hepatitis B at least once, because chronic infection is often silent. It matters especially if you have ongoing risk or were born somewhere hepatitis B is common.

Is there a vaccine or treatment?

There's a safe, effective vaccine recommended for all adults through age 59 (and older adults at risk). There's no cure for chronic hepatitis B, but medication and monitoring keep the liver healthy and lower the risk of cirrhosis and liver cancer.

Does acute hepatitis B always become chronic?

No. Most healthy adults clear an acute infection completely. The risk of it becoming chronic is highest for infants and young children, which is why the vaccine starts at birth.

Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.

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