Doctor's Assessment Included
Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
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.
What It 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.
Why It 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.
When to Test
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.
Recommendations
Male
Negative result indicates no current Hepatitis B infection. Consider vaccination if not immune.
Positive result indicates current Hepatitis B infection. Requires immediate consultation with hepatologist for treatment evaluation.
Female
Negative result indicates no current Hepatitis B infection. Consider vaccination if not immune.
Positive result indicates current Hepatitis B infection. Requires immediate consultation with hepatologist for treatment evaluation.
Lifestyle Tips
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.