What Is a Stool Test? Why Is It Performed?

Created: 13.04.2026  ·  Last Updated: 09.07.2026  ·  Category: Internal Medicine and Gastroenterology  ·  Prepared by the Academic Hospital Web and Medical Editorial Board.

What Is Stool?

Stool is feces eliminated by the digestive system, providing information about the body’s functioning and digestive health.

For a healthy digestive system, the structure, color and odor of stool are very important and provide important clues for identifying digestive system diseases.

Important Information: The color, consistency and odor of stool, and whether it contains blood or mucus, may provide clues about digestive system health; however, they do not provide a definitive diagnosis on their own. Medical evaluation is needed for prolonged or recurrent complaints.

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What Is a Stool Test?

A stool test is a reliable and necessary test for evaluating digestive health. A stool sample is subjected to laboratory analysis. Thanks to these tests, abnormalities in the digestive system, intestinal infections and other digestive system diseases can be detected.

Why Are Stool Tests Performed?

Stool tests are performed for many reasons, such as evaluating digestive system health, detecting the presence of infection or parasites, and examining digestive disorders. With this test, problems occurring in the body are identified and an appropriate treatment method is planned.

Blood or mucus in the stool, diarrhea lasting longer than three days, stomach pain or cramps, prolonged nausea or vomiting are conditions that should be carefully evaluated in terms of digestive system health. These symptoms may be warning signs of serious health problems such as intestinal infections, inflammatory bowel diseases, and stomach and intestinal bleeding. In addition, if fever and persistent digestive problems are also observed together with these symptoms, a stool test may need to be requested for a more detailed evaluation.

This test provides important information for detecting problems in the digestive system and creating the correct treatment plan.

How Is a Stool Test Done?

A stool sample is collected for a stool test. It is delivered to the laboratory for bacterial or parasite examination under a microscope and for various tests.

  1. It is important that the sample is collected appropriately so that the test gives accurate results.
  2. The container provided by healthcare institutions should be used for the test. These containers ensure that the sample reaches the laboratory safely.
  3. It is important that the sample does not come into contact with urine and does not contaminate the outer surface of the container.
  4. After the sample is collected, it should be delivered to the laboratory as soon as possible.
  5. In some cases, your doctor may recommend avoiding certain foods or stopping certain medications before collecting the sample.
Sample note: Delivering the stool sample in the correct container, without mixing it with urine and as soon as possible, is important for the reliability of the test.

What Is Checked in a Stool Test?

  • It is checked whether there is bleeding in the stomach or intestines; this condition may be a sign of a stomach ulcer or intestinal cancer.
  • The presence of parasites and bacteria that cause intestinal infections is checked.
  • It is evaluated whether fat digestion is sufficient. This condition is one of the signs of disorders such as pancreatitis or celiac disease.
  • Stool tests check whether foods are digested properly. They examine whether the enzymes produced by the pancreas are sufficient.
  • They help us understand whether there is inflammation in the intestinal wall. Inflammatory bowel diseases such as Crohn’s disease or ulcerative colitis play an important role in diagnosis.
  • Stool color provides important clues about digestive system health and may be a sign of certain diseases or health conditions. Changes in stool color may also be related to gallbladder disorders, diet or medications; however, if there is a persistent or sudden color change, it is important to consult a doctor.

Stool is an indicator that provides information about digestive system health and is analyzed for the diagnosis of various diseases. Stool tests are very important for maintaining intestinal health and for the early diagnosis of possible disorders.

Situations that may require consulting a doctor:

  • Blood or mucus in the stool
  • Diarrhea lasting longer than three days
  • Severe abdominal pain, cramps, prolonged nausea or vomiting
  • Fever and persistent digestive problems
  • Persistent or sudden change in stool color

Do Not Delay Your Digestive System Complaints

You can receive specialist evaluation for complaints such as blood or mucus in the stool, prolonged diarrhea, stomach pain, cramps, nausea, vomiting or a noticeable change in stool color.

Frequently Asked Questions

Can a stool test be done at home?
The sample collection process for a stool test can be done at home, but it is important that the sample is collected and stored correctly. The sample should be collected in the containers provided by healthcare institutions and delivered to the laboratory.
When does the stool test result come out?
This period may vary depending on the type of test and the laboratory workload. Results may take a few days longer for some special analyses. You can get information from your laboratory or healthcare institution for the exact timing of your test results.
What should healthy stool be like?
Healthy stool should be brown in color and soft but formed in consistency. Its texture should allow easy passage and should not be too hard or too liquid. Healthy stool should generally be passed regularly and without straining.
What does blood in a stool test mean?
Blood detected in a stool test may suggest bleeding originating from the stomach or intestines. This may be associated with different causes such as ulcers, polyps, inflammatory bowel disease or intestinal cancer; therefore, physician evaluation is required.
For which complaints can a stool test be requested?
A stool test may be requested in cases such as blood or mucus in the stool, diarrhea lasting longer than three days, stomach pain, cramps, prolonged nausea, vomiting, fever and persistent digestive problems.
Is a change in stool color important?
Changes in stool color may be related to diet, medications or the bile system. However, if a persistent or sudden color change is accompanied by blood or other digestive complaints, it is important to consult a doctor.
Academic Hospital note: If you have blood or mucus in the stool, prolonged diarrhea, abdominal pain, cramps, nausea, vomiting, fever or a persistent change in stool color, you can book an appointment.

References

The general information in this content about stool testing, stool sample collection, occult blood in stool, parasite testing and digestive system evaluation is supported by the following reliable health sources.

  1. Cleveland Clinic, "Stool Test: What It Is, Purpose, Procedure, Results & Types", clevelandclinic.org
  2. MedlinePlus, "Fecal Occult Blood Test (FOBT)", medlineplus.gov
  3. MedlinePlus, "Ova and Parasite Test", medlineplus.gov
  4. Mayo Clinic, "Fecal occult blood test", mayoclinic.org
  5. MedlinePlus, "Calprotectin Stool Test", medlineplus.gov