Anti-Amebic Antibody (Serum) – IgG Class
This test measures the level of antibodies in your blood that your immune system produces in response to *Entamoeba histolytica*, a parasite that can cause intestinal infections and liver abscesses.
["Helps diagnose amebiasis by detecting your immune system’s reaction to the parasite."]
Key facts at a glance
- LOINC
- 31830-3
- Short code
- G lamblia Ag Stl Ql
- Synonyms
- G lamblia Ag Stl Ql
- Category
- chemistry
- Sample
- stool
- Container
- Clean container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 g
- Stability
- Refrigerated: 24h, Frozen: 7d
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may recommend this test if you have symptoms like abdominal pain, diarrhea (sometimes with blood), fever, or liver issues. It’s also used in cases of travel to regions with higher parasite risk, unexplained infections, or after exposure to contaminated water. This test doesn’t confirm the parasite’s presence directly but helps assess whether your body has mounted an immune response.
What to Expect Before the Test
No special preparation is needed. You’ll have a blood sample drawn from a vein, usually in your arm. The process takes a few minutes. If you’re on blood-thinning medication or have a history of bleeding disorders, let your provider know.
What the Test Results Mean
High levels of anti-amebic antibodies suggest your immune system has encountered *Entamoeba histolytica*, but they don’t confirm active infection. False positives can occur, especially with past exposure or cross-reactions. Results are interpreted by your provider alongside clinical findings, stool tests, or imaging.
Possible Side Effects or Risks
Minor side effects like bruising, soreness, or a slight pinch at the injection site may occur. Rarely, blood clots or allergic reactions can happen, though these are uncommon with standard phlebotomy. If you’re pregnant, have a bleeding disorder, or take anticoagulants, discuss these risks with your provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
IgG Anti-Amebic Antibody (Serum)
Frequently asked questions
This test is primarily used as a screening or confirmatory tool for *Entamoeba histolytica* infection, which can lead to severe complications like liver abscesses or colitis. While antibodies indicate past or possible exposure, active infection is usually diagnosed with stool exams or imaging studies. It’s not a standalone test for diagnosing amebiasis but supports broader diagnostic workups.
No, this test only detects antibodies your body has produced in response to the parasite. For active infection, your provider may also order stool tests (looking for parasite oocysts/cysts) or imaging studies (like CT scans) to confirm current illness.
How long does it take to get results?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy