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Hepatitis B is a serious liver infection caused by the hepatitis B virus. This infection can range from a mild illness lasting a few weeks to a severe, chronic condition that can lead to liver damage, cirrhosis, or liver cancer. The virus spreads through contact with infected blood or other body fluids. Many people with hepatitis B may not show symptoms initially, which is why laboratory testing plays a crucial role in diagnosis and monitoring of the disease.

Several blood tests are used to detect hepatitis B infection and determine its stage. The hepatitis B surface antigen test checks for the presence of the virus in your blood and is often the first test performed when hepatitis B is suspected. If this test is positive, it indicates an active infection, either acute or chronic. The hepatitis B surface antibody test determines if you have developed immunity to the virus, either through vaccination or recovery from a past infection. Another important test is the hepatitis B core antibody test, which can show if you have ever been infected with the virus, even if you have recovered.

For people diagnosed with hepatitis B, additional laboratory tests help monitor the infection and guide treatment decisions. These include tests that measure viral load, which shows how much virus is present in the blood, and liver function tests that assess how well the liver is working. The hepatitis B e-antigen and its corresponding antibody tests provide information about how active the virus is and whether it is likely to be transmitted to others. Regular monitoring through these tests helps healthcare providers determine if antiviral treatment is needed and whether the treatment is working effectively.

Early detection through laboratory testing is essential because hepatitis B can be managed effectively with appropriate medical care. People at higher risk, including healthcare workers, those with multiple sexual partners, injection drug users, and individuals born in areas where hepatitis B is common, should consider getting tested. Pregnant women are also routinely screened because the virus can be transmitted to babies during childbirth. Vaccination is available and highly effective at preventing hepatitis B infection, and testing can confirm whether someone has immunity or needs vaccination.