Stool Test

A stool test is a diagnostic tool that healthcare providers use to find out why you’re having stomach issues. This test can detect bacteria, viruses and other germs in your poop that can make you sick. Healthcare providers use stool tests to help diagnose gastrointestinal diseases and colon cancer.

Overview

What is a stool test?

A stool test looks for pathogens (bacteria, viruses, parasites) in your poop that can make you sick. Stool tests can also look for other signs, like hidden blood, that signal something’s wrong. Healthcare providers can use stool tests to check for a wide range of gastrointestinal (GI) issues, including infections and cancers.

Your healthcare provider might recommend a stool test if you develop symptoms like:

• Blood in your poop.
• Mucus in your poop.
• Diarrhea (loose poop) that’s lasted for more than three days.
• Stomach pain or cramping.
• Nausea or vomiting that lasts days.
• Fever.

What does a stool test check for?

Stool tests can check for several different gastrointestinal conditions, including:

• Anal fissures (a small cut in your anus, where poop comes out).
• Anemia (lack of red blood cells).
• Colitis (swelling or irritation in your colon, part of your intestine).
• Colon polyps (small clumps of cells in the colon).
• Colorectal (colon) cancer.
• Diverticulosis (bulging pockets in the intestine).
• Exocrine pancreatic insufficiency (EPC) (not able to break down food in the intestines).
• Gastrointestinal (GI) bleeding.
• Hemorrhoids (swollen veins in your anus).
• Infections (bacterial, viral, or parasitic).
• Inflammatory bowel disease (IBD) (irritation in your digestive tract).
• Steatorrhea (excess fat in your poop).
• Stomach ulcers (sores in your stomach).

Types of stool tests

There are different types of stool tests. Your provider will choose the best test based on your symptoms:

1. Fecal occult blood test (FOBT): This type of stool test looks for traces of blood in your poop. A positive result means you have bleeding somewhere in your digestive tract.
2. FIT-DNA test: Like the FOBT, this stool test detects tiny amounts of blood in your poop. But it also looks for altered DNA that could indicate precancerous or cancerous conditions. (Note: “FIT” stands for fecal immunochemical test.)
3. Tests for infection: Providers can run these tests in a few different ways. But all these tests look for germs in your stool by either growing them, looking for them under the microscope or looking for germ DNA.

Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy

Test Details

How do I prepare for a stool test?

You may not need to make special preparations before your stool test. But there are some instances where your provider may ask you to follow certain instructions (like stopping certain medications or avoiding certain types of foods). These instructions will depend on the test you take and can be different for different people. Be sure to ask your healthcare provider if you need to do anything differently before your stool test.

How do I collect my stool sample?

In most cases, you’ll be able to collect your stool sample at home. Your provider will give you everything you’ll need, including a specimen container with your name and birthdate.

Your provider will give you specific instructions, but here are some general steps for collecting your stool sample:

1. If you need to pee, do it before you set up for your stool test. You’ll want to avoid mixing pee with your poop sample because it can interfere with the results.
2. Place something in the toilet to catch your poop. Your provider may give you a tray or container for this purpose. You can also place a piece of plastic wrap between the toilet seat and the rim of the toilet bowl or any clean container. (Avoid the plastic wrap method if you have loose or watery poop.)
3. Don’t let your poop touch the inside of the toilet bowl. This can contaminate your sample.
4. Use a plastic scoop to place the sample inside the specimen container. Your provider will tell you how much poop they need, or the container will have a fill line. (If your provider didn’t give you a plastic scoop, you can use a disposable spoon.)
5. Close the specimen container immediately and secure the lid tightly.
6. If there’s remaining poop, carefully tip it into the toilet.
7. Put everything you used to collect the poop into a plastic bag, tie it up tightly and place it in the waste bin.
8. Wash your hands thoroughly with antibacterial soap and running water.
9. Deliver your specimen to the lab or your provider’s office as soon as possible. If you need to wait for any reason, you can keep your sample in the refrigerator for a short time. If you don’t return your sample within 24 hours, your stool sample probably won’t be tested.

Be sure to read any instructions your healthcare provider gives you. They may have more specific guidelines for collecting your specimen.