Partner with Getlabs to collect diagnostics at home. Learn More
A hepatitis B surface antigen (HBsAg) blood test is a laboratory test that detects the presence of the hepatitis B virus (HBV) in the blood. HBsAg is a protein found on the surface of the HBV and is often the first sign that a person has been infected with the virus. A positive test result indicates that the person is infected with HBV, while a negative result indicates that the person is not infected or has developed immunity to the virus.
This page is provided for educational and informational purposes only and does not constitute the provision of medical advice or professional services. The information provided should not be used for diagnosing or treating a health problem or disease, and those seeking personal medical advice regarding any of the tests and conditions referenced above are advised to consult with a licensed clinician. Always seek the advice of your qualified health provider regarding a medical condition and do not disregard professional medical advice or delay in seeking it because of any information on this page. If you think you may have a medical emergency, immediately call 911 or go to the nearest urgent care center or hospital.
