Understanding Lab Tests for Acute Hepatitis A Infection
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Acute Hepatitis A infection is a viral liver infection caused by the Hepatitis A virus (HAV). This highly contagious infection typically causes inflammation of the liver and can lead to symptoms such as jaundice, fatigue, nausea, and abdominal pain. Accurate diagnosis requires specific blood testing to detect the body's immune response to the virus.
Recommended Test
Hepatitis A IgM Antibody
This test detects IgM antibodies specific to Hepatitis A virus, which are produced by the immune system during an active or recent infection. These antibodies typically appear within 2 weeks of infection and indicate acute Hepatitis A. A positive result confirms the diagnosis and helps healthcare providers initiate appropriate care and prevention measures.
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Diagnosing Acute Hepatitis A Infection
Since symptoms of Hepatitis A can overlap with other liver conditions or viral infections, laboratory testing is essential for confirming the diagnosis. Blood tests can detect specific antibodies that the immune system produces in response to the Hepatitis A virus, providing definitive evidence of infection.
Understanding Test Results
The Hepatitis A IgM antibody test is highly specific for acute infection. Positive results indicate current or recent Hepatitis A infection, while negative results suggest the absence of acute infection. This testing is crucial not only for diagnosis but also for public health measures, as Hepatitis A is highly contagious and requires appropriate isolation and contact tracing.
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 Hepatitis A infection, seek medical attention promptly for proper testing and care.
