Understanding Lab Tests for Acute Hepatitis B infection
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Acute Hepatitis B infection is a viral infection that affects the liver, caused by the Hepatitis B virus (HBV). Early detection through specific blood tests is crucial for proper treatment and preventing transmission to others. Unlike chronic Hepatitis B, acute infection typically develops within the first 6 months after exposure to the virus.
Recommended Test
Hep B Core Antibody, IgM
This test is a primary diagnostic marker for recent Hepatitis B infection. The Hepatitis B Core Antibody (IgM) is produced by the immune system in response to the core antigen of the Hepatitis B virus. It typically appears within 4 to 6 weeks after infection and persists for about 6 months, making it an excellent indicator of acute infection.
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Diagnosing Acute Hepatitis B Infection
Blood tests are the primary method for diagnosing acute Hepatitis B infection. These tests detect specific antibodies and antigens produced by the immune system in response to the virus. Accurate diagnosis is essential because symptoms can be similar to other liver conditions or may be absent in some cases.
Understanding Test Results
A positive result for Hepatitis B Core Antibody IgM indicates a recent or acute Hepatitis B infection. This test is particularly valuable because it can detect the infection during the window period when other markers might not yet be present or may have cleared from the blood.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment. If you suspect exposure to Hepatitis B or are experiencing symptoms, seek medical attention promptly.
