Skip to Content
Home > Health Resources > Antigen Tests for Giardiasis
View Additional Section Content
For a giardia antigen test, a stool sample or fluid from the upper
part of the intestines (duodenal fluid) is tested in the lab for the presence
antigens from Giardia lamblia.
This test is often done at the same time as a stool analysis.
An antigen test may be done if a person's medical history and
giardiasis. This test may be done to check if the
person has been cured after treatment. An antigen test also may be used to
screen people who are at high risk for having giardiasis.
A test that detects Giardia antigens (positive result) indicates that the person
has giardiasis. If the infected person does not have symptoms of infection, he
or she may be a carrier or have an chronic infection.
These tests are specific for Giardia lamblia and do not test for
other intestinal infections that cause similar
symptoms. A person may get infected with other organisms that cause the same
symptoms if he or she travels to countries where these organisms are
If the test does not detect antigens (negative result), it may need
to be repeated to rule out giardiasis.
These tests may be done on a stool sample before testing the fluid
from the small intestines (duodenal contents). Antigen tests are very likely to detect Giardia lamblia if it is present and may be used instead of a stool analysis when
giardiasis is likely. Stool samples may be tested to detect antigens (proteins
that come from Giardia lamblia) or to detect the actual
Complete the medical test information form (PDF)(What is a PDF document?) to help you prepare for this test.
ByHealthwise StaffPrimary Medical ReviewerE. Gregory Thompson, MD - Internal MedicineAdam Husney, MD - Family MedicineSpecialist Medical ReviewerW. David Colby IV, MSc, MD, FRCPC - Infectious Disease
Current as ofMarch 3, 2017
Current as of:
March 3, 2017
E. Gregory Thompson, MD - Internal Medicine & Adam Husney, MD - Family Medicine & W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
To learn more about Healthwise, visit Healthwise.org.
© 1995-2017 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Our interactive Decision Points guide you through making key health decisions by combining medical information with your personal information.
You'll find Decision Points to help you answer questions about:
Get started learning more about your health!
Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.
2700 Clay Edwards Drive, Ste 240, North Kansas City, MO 64116