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Hepatitis B surface antigen (HBsAg) can usually be detected from a blood sample as early as a few days or a week before clinical symptoms emerge. The HBsAg test helps to assess the hepatitis B viral infection (acute as well as chronic) and the patient’s infectiousness, as well as the effectiveness of treatment against the virus.
HBsAg is one of the earliest hepatitis B markers in the blood: it can be detected from the 6th week until 6 months and before any clinical symptoms appear.
If hepatitis B surface antigen stays in the blood for more than 6 months and there are no hepatitis B virus antibodies, it indicates infectiousness and chronic hepatitis B.
Hepatitis B is a liver disease caused by infection with a virus. It can also be transmitted by infected blood, sexually or during childbirth from a mother to a baby. Often the disease occurs without any symptoms or has a clinical presentation similar to influenza. Symptoms also include enlarged liver, painfulness and jaundice, among others. About 90% of patients recover from acute hepatitis within 3-6 months, but in up to 10% of cases, the infection may become chronic (i.e., the virus can be detected in the blood even 6 months after the person became infected). In less than 1% of cases, hepatitis may progress and develop into liver cirrhosis or cancer.
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