How It Feels
Collecting a stool sample does not
normally cause any discomfort.
If your doctor collects the stool
sample using a cotton swab, you may feel some pressure or discomfort as the
cotton swab is inserted into your rectum.
There is no chance for problems while collecting
a stool sample. Be sure to wear gloves when you collect the sample and wash
your hands before and after you collect the sample. This will help protect you
from spreading an infection.
A stool culture is done to identify
bacteria, viruses, or fungi that may be causing an infection. Stool
culture test results usually take 2 to 3 days. But some cultures for fungus may take weeks to get results.
No disease-causing (pathogenic) bacteria, fungi, or viruses are present or grow in the culture.
Bacteria (such as
salmonella, shigella, campylobacter, certain types of
Escherichia coli[E. coli], or
Yersinia enterocolitica) grow in the culture. Fungi such as yeast are found in the stool.
If bacteria are found in the culture,
sensitivity testing may be done to help choose the
The stool also may be examined under a microscope to look for parasites such as Giardia.
What Affects the Test
Reasons you may not be able to
have the test or why the results may not be helpful include:
- Recent use of antibiotics, medicine (such as
bismuth) to control diarrhea, enemas, or laxatives.
- Recent X-ray
tests using a
contrast material containing barium.
stool sample that is mixed with urine.
- Not collecting a
large enough sample.
- Not getting the stool sample to the lab for
testing quickly enough.
What To Think About
- You may have an
infection even if your stool culture test is normal.
testing helps your doctor choose the best treatment for the specific disease or
- A stool sample may be tested for
parasites such as pinworms, roundworms, tapeworms and
the protozoan Giardia that causes
giardiasis. The parasites or their eggs can often be
seen during an examination of the stool sample under a microscope.
- A stool sample can also be
- A stool analysis is a series of tests done on a
sample of stool to help diagnose certain conditions affecting the digestive
tract, including infection, poor absorption, or cancer. To learn more,
see the topic