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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, lifelong condition. When someone first becomes infected with hepatitis B, it is called acute hepatitis B. If the body cannot clear the virus within six months, the infection becomes chronic, meaning it persists for a long time and can lead to serious health problems including liver damage, cirrhosis, liver cancer, and even liver failure.

Laboratory testing plays a crucial role in diagnosing hepatitis B infection and determining whether it is acute or chronic. The most common initial screening test is the hepatitis B surface antigen test, also known as HBsAg. If this test is positive, it indicates that a person is currently infected with the hepatitis B virus. Additional blood tests can help determine whether the infection is new or long-standing. These include tests for hepatitis B surface antibodies, hepatitis B core antibodies, and hepatitis B e-antigen. Together, these tests provide a complete picture of the infection status and help doctors understand how the immune system is responding to the virus.

For people diagnosed with chronic hepatitis B, regular monitoring through laboratory tests is essential. Liver function tests measure enzymes and proteins in the blood that indicate how well the liver is working. Elevated levels of certain liver enzymes can signal liver inflammation or damage. Another important test measures the amount of virus in the blood, known as the viral load or HBV DNA test. This test helps doctors assess the severity of the infection and decide whether antiviral treatment is necessary. Regular monitoring also includes checking alpha-fetoprotein levels, which can be an early indicator of liver cancer.

Vaccination is the most effective way to prevent hepatitis B infection. After receiving the hepatitis B vaccine series, a blood test for hepatitis B surface antibodies can confirm whether the vaccination was successful and the person has developed immunity. Healthcare workers, people with multiple sexual partners, individuals who inject drugs, and those living with someone who has hepatitis B should ensure they are vaccinated and tested appropriately. Early detection through laboratory testing allows for timely treatment and monitoring, which can significantly improve long-term health outcomes for people with hepatitis B.