Anti-Amebic Antibody, Serum (Qualitative Immunoassay for *Amebiasis*)

Your doctor may order this test if you have symptoms that suggest an amebiasis infection, such as ongoing diarrhea, stomach pain, cramping, or unexplained weight loss. It may also be ordered if you recently traveled to a region where the parasite is common, drank untreated water, or had close contact with someone diagnosed with the infection.

Your healthcare provider may recommend this test if you have symptoms like persistent diarrhea, abdominal pain, or fever, especially after traveling to regions with higher parasite risk. It’s also used to monitor people with known amebiasis or those at higher risk (e.g., immunocompromised individuals).

Before the test, tell your doctor about all medicines and supplements you take, especially antibiotics or antidiarrheal drugs, since these can affect the results. You may be asked to pause certain medicines briefly. If a stool sample is needed, you will get instructions for collecting it cleanly at home and returning it to the lab promptly.

No special preparation is needed. You’ll have a simple blood draw from a vein, usually in your arm. The blood sample will be sent to a lab for antibody detection using an immunoassay method.

A positive result usually means the parasite that causes amebiasis was found in your sample, and your doctor will discuss treatment, often prescription medication. A negative result can mean you are not infected, but it does not always rule out amebiasis, so your doctor may repeat the test or order additional testing if symptoms continue.

A positive result means your body has detected antibodies against *Entamoeba histolytica*, suggesting past infection. A negative result means no detectable antibodies were found in this sample, but it doesn’t rule out current infection (since antibodies may take time to develop).

Common symptoms include loose or watery stools, stomach cramps, bloating, gas, nausea, loss of appetite, and fatigue. Some people feel only mild discomfort, while others develop severe abdominal pain, bloody stools, or fever. In rare cases the infection can spread beyond the intestines, most often to the liver, and many infected people have no symptoms at all.

Symptoms may include stomach pain, diarrhea (sometimes bloody), fever, or liver abscesses. Some people, especially those with weakened immune systems, may have no symptoms but still carry the parasite.