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STD Serology

Hepatitis B test (HBsAg): what this blood test indicates

The hepatitis B test detects HBsAg, a marker that can indicate an active hepatitis B infection, whether acute or chronic. It is a data point that needs professional interpretation, not a diagnosis. A doctor can advise on further evaluation.

Doctor's Assessment Included

Reference Ranges

Expected result Negative

A negative result means no active hepatitis B infection was detected. Note that HBsAg only becomes detectable 1 to 12 weeks after exposure, so a negative result shortly after a possible exposure does not rule out infection. Dutch laboratories therefore never test HBsAg alone, but always alongside anti-HBc (RIVM, NHG).

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Hepatitis B Surface Antigen: what this test measures

This test detects the hepatitis B surface antigen, a protein on the outer surface of the hepatitis B virus. HBsAg is one of the first detectable markers after infection and can indicate an acute or chronic infection. The test provides a qualitative result indicating whether the antigen is present in your blood.

Hepatitis B Surface Antigen: why this value matters

A positive HBsAg can point to an active infection, but on its own it does not indicate whether the situation is recent or long-standing. Further evaluation is needed to understand what it means, and other markers help complete the picture. A huisarts or the BIG-registered doctor can guide next steps.

Hepatitis B Surface Antigen: when is testing worthwhile?

HBsAg can appear from roughly 4 weeks, and sometimes up to a few months, after exposure, so testing very early may miss it. A doctor can help you decide on timing and whether a repeat test is useful. A positive result should always be followed up professionally.

Hepatitis B Surface Antigen: what to do about an abnormal value

Male

If Low

Negative result indicates no current Hepatitis B infection. Consider vaccination if not immune.

If High

Positive result indicates current Hepatitis B infection. Requires immediate consultation with hepatologist for treatment evaluation.

Female

If Low

Negative result indicates no current Hepatitis B infection. Consider vaccination if not immune.

If High

Positive result indicates current Hepatitis B infection. Requires immediate consultation with hepatologist for treatment evaluation.

Hepatitis B Surface Antigen: lifestyle and this value

Protect your liver by limiting alcohol intake, maintaining a balanced diet, and exercising regularly. If you have not been vaccinated against hepatitis B, discuss vaccination with your healthcare provider. Avoid sharing needles, razors, or other personal items that may carry blood.

Hepatitis B Surface Antigen: frequently asked questions

Does a positive HBsAg mean a chronic infection?
No. A positive HBsAg can indicate an active infection, but on its own it does not tell whether the situation is acute or chronic. A doctor uses further evaluation to understand what it means.
How soon after exposure can HBsAg show up?
HBsAg can appear from roughly 4 weeks, and sometimes up to a few months, after exposure. Testing very early may miss it, so a doctor may suggest a repeat test.
How is the test done?
It is a blood test taken at one of the collection locations. You can order online without a referral and a positive result should be discussed with a doctor.

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Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

Medical policy
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Hepatitis B Surface Antigen

€55,-