A standard physical exam is usually done when
giardiasis is suspected. Some doctors include a rectal
exam. A stool analysis often is done to look for signs of the parasite. The
stool sample can often be collected at home and then returned to the doctor for
The medical history will include questions about recent possible
The medical history and physical exam are done to evaluate possible
symptoms of giardiasis, especially persistent diarrhea.
Except for diarrhea and other gastrointestinal (GI) symptoms,
results of the physical exam are generally normal for people who have giardiasis.
But some weight loss [up to
10 lb (4.5 kg) or more] is
Lab test results are usually normal. Blood levels of carotene (a
form of vitamin A) and folic acid (a B vitamin) may be low. But these can be
reversed quickly with treatment.
Symptoms that are not typical of giardiasis may be caused by
other intestinal infections or conditions. Depending
on the specific symptoms and medical history, additional tests may be done to
evaluate other possible causes of diarrhea.
Symptoms can start to occur long after exposure, so be sure to tell
your doctor if you may have swallowed untreated water. Even very small amounts
of untreated water can contain enough Giardia lamblia to
Exposure to Giardia lamblia through day care
or nursing home employees may be more difficult to remember or link to the
start of symptoms.
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 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 & W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
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Last modified on: 8 September 2017