How do you test for Giardia in humans?
John Castro
Published Jan 04, 2026
To help diagnose giardia infection (giardiasis), your doctor is likely to test a sample of your stool. For accuracy, you may be asked to submit several stool samples collected over a period of days. The samples are then examined in a lab for the presence of parasites.
Can a blood test detect Giardia?
Giardiasis is a parasitic infection of the upper small intestine and is a common traveller's infection among tourists and business travellers to developing countries. This blood test is used to confirm a Giardiasis infection.What tests are used to diagnose Giardia?
Microscopy with direct fluorescent antibody testing (DFA) is considered the test of choice for diagnosis of giardiasis since it provides increased sensitivity over non-fluorescent microscopy techniques.How long does Giardia last in humans without treatment?
Living with giardiasisIf it's left untreated, symptoms can last 6 weeks or more. As with any illness, complications can occur. These include: Dehydration – losing too much water and other fluids in your body.