A member asked:

Is negative hbsag hepatitis b test conclusive 14 weeks after exposure in a healthy adult?

3 doctors weighed in across 2 answers
Dr. Deborah Lim answered

Specializes in Internal Medicine

Quite conclusive: HBsAg is the first serologic marker that can be detected following exposure to HBV, as early as 1 or 2 weeks and as late as 11 or 12 weeks post exposure. If you are 14 weeks post exposure, it should be quite a convincing that you did not acquire an acute hep B infection. You should still discuss with your doctor regarding his thoughts on this.

Answered 9/20/2017

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Yes: The false negative rate is pretty low from what I remember. You should be ok.

Answered 10/4/2016

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