ENTAMOEBA HISTOLYTICA ANTIBODY (IGG) - AMOEBIASIS

The Entamoeba histolytica Antibody (IgG) Test is a specialized blood test used to detect IgG antibodies produced by the immune system in response to infection with Entamoeba histolytica, the parasite responsible for amoebiasis. This test is particularly useful in diagnosing invasive amoebiasis, including amoebic liver abscess, especially when stool examination is inconclusive or when the infection has spread beyond the intestines.

Amoebiasis is a parasitic infection commonly transmitted through contaminated food or water containing the cysts of Entamoeba histolytica. While many infected individuals remain symptom-free, others may develop intestinal disease characterized by diarrhea, abdominal pain, and bloody stools. In more severe cases, the parasite can invade other organs, particularly the liver, causing an amoebic liver abscess, which may present with fever, right upper abdominal pain, liver tenderness, and general weakness.

The Entamoeba histolytica IgG Antibody Test detects antibodies that develop after infection. Although it does not always distinguish between current and previous exposure, it is highly valuable for diagnosing extraintestinal amoebiasis, where stool tests may be negative despite active disease.

Doctors often recommend this test when imaging studies suggest a liver abscess, when patients have persistent gastrointestinal symptoms with suspected amoebiasis, or when there is a history of travel or residence in areas where amoebiasis is common. The test is usually interpreted along with clinical findings, stool examination, ultrasound, CT scan, and other laboratory investigations to establish an accurate diagnosis.

Benefits of the Test

• Helps diagnose invasive amoebiasis.
• Supports the diagnosis of amoebic liver abscess.
• Detects IgG antibodies against Entamoeba histolytica.
• Useful when stool examination is negative or inconclusive.
• Assists in differentiating amoebiasis from other causes of liver abscess.
• Requires only a simple blood sample.
• Supports timely diagnosis and appropriate treatment.
• Provides valuable information alongside imaging studies.

Why Doctors Recommend This Test

Doctors recommend the Entamoeba histolytica IgG Antibody Test for patients with suspected invasive amoebiasis, persistent abdominal symptoms, unexplained liver abscesses, prolonged fever, or a history of travel to endemic regions. It is especially useful when stool tests do not confirm infection but clinical suspicion remains high.

Preparation Before the Test

No special preparation is required.

You may eat and drink normally unless instructed otherwise by your healthcare provider. Inform your doctor about your symptoms, recent travel, previous parasitic infections, medications, or imaging findings. A blood sample is collected from a vein for laboratory analysis.

Normal Reporting Time

Typically: 2–5 Working Days

Reporting time may vary depending on laboratory methodology.

Who Should Take This Test?

This test is recommended for:

• Individuals with suspected amoebiasis.
• Patients with suspected amoebic liver abscess.
• People with prolonged abdominal pain and diarrhea.
• Individuals with unexplained liver lesions on imaging.
• Patients with persistent fever of unknown origin.
• Travelers returning from areas where amoebiasis is common.
• Individuals consuming contaminated food or water.
• Patients with chronic gastrointestinal symptoms.
• Individuals referred by infectious disease or gastroenterology specialists.
• Anyone advised by their healthcare provider to undergo amoebiasis serology testing.