The Hepatitis A (IgM) blood test is used to identify a recent or current infection with the Hepatitis A virus, a virus that primarily affects the liver. Hepatitis A is most commonly transmitted through contaminated food or water and is more prevalent in areas with poor sanitation or during outbreaks linked to food handling.

When the body is exposed to the Hepatitis A virus, the immune system produces specific antibodies. IgM antibodies are produced early in the course of infection, making them a reliable marker of recent or active infection. This test is therefore particularly useful when symptoms suggest acute hepatitis.

Symptoms of Hepatitis A can vary widely between individuals. Some people may experience mild, flu-like symptoms, while others may develop more noticeable signs such as fatigue, nausea, abdominal pain, dark urine, pale stools, or yellowing of the skin and eyes (jaundice). In some cases, especially in adults, symptoms can persist for several weeks.

Identifying a Hepatitis A infection early is important for both clinical and public health reasons. While Hepatitis A does not usually lead to long-term liver damage, early diagnosis helps guide symptom management, prevents unnecessary investigations, and reduces the risk of spreading the infection to others.

This test is often requested when liver function tests are abnormal, when symptoms of hepatitis are present, or following potential exposure to the virus. It may also be used during outbreak investigations or when assessing individuals who have recently travelled to areas where Hepatitis A is more common.