Stool test

Overview

A stool test is a simple test that looks at a small sample of your poop. It helps doctors find the cause of digestive problems such as diarrhea, blood in the stool, or stomach pain. The test can check for infections, inflammation, or hidden blood.

Yes, stool tests are a common diagnostic tool used worldwide for people with digestive symptoms.

Anyone can have a stool test, especially those with ongoing diarrhea, stomach pain, weight loss, or blood in their stool.

Symptoms

Common symptoms

• Diarrhea that lasts more than a few days
• Blood or mucus in the stool
• Unexplained weight loss
• Stomach pain or cramping
• Fever along with digestive symptoms

Symptoms in children

• Persistent diarrhea (more than a few days)
• Blood in the diaper or stool
• Vomiting that prevents keeping fluids down
• Refusing to eat or drink

Symptoms in older adults

• Changes in bowel habits that last more than a few weeks
• Unexplained weight loss or loss of appetite
• Fatigue along with digestive symptoms
• Blood in the stool (may be less obvious)

Causes

Main causes

• A stool test is done to find the cause of symptoms such as diarrhea, abdominal pain, or blood in the stool. Reasons for the test include checking for infections (bacteria, viruses, or parasites), inflammation (such as in inflammatory bowel disease), or hidden blood (which may be a sign of polyps or cancer in the colon).

Risk factors

• Recent travel to areas with poor sanitation
• Recent use of antibiotics (which can alter gut bacteria)
• Contact with someone who has a digestive infection
• Having a weakened immune system (from illness or medications)
• Being over 50 years old (for colorectal screening)
• Family history of colon cancer or inflammatory bowel disease

When to see a doctor

See a doctor urgently if:

• If you see large amounts of blood in your stool or have black, tarry stools
• If you have severe stomach pain that does not go away
• If you have diarrhea with high fever or signs of dehydration (very dry mouth, no urine for 8 hours)

Book a routine appointment if:

• If you have mild diarrhea that lasts more than 3 to 5 days
• If you notice small streaks of blood in your stool for more than a day
• If you have unexplained weight loss or a change in bowel habits lasting more than 2 weeks

Diagnosis

Your doctor will ask you to collect a small sample of your stool in a clean container. Sometimes you may be asked to collect samples on three different days. The sample is sent to a lab where it is tested for infections, blood, or other signs of disease.

Tests that may be done

• Stool culture (to find bacteria that cause infection)
• Fecal occult blood test (to find hidden blood)
• Ova and parasite test (to find parasites)
• Stool calprotectin test (to check for inflammation in the bowel)

What to expect at your appointment

You collect the sample at home using a kit provided by your doctor or pharmacy. Follow the instructions carefully. The sample is then taken to a lab. Results may take a few days to a week. The test itself is not painful.

Treatment

Treatment depends on what the stool test finds. If an infection is found, you may need rest and fluids. If inflammation or other conditions are found, your doctor will recommend a treatment plan tailored to you.

Self-care at home

• Drink plenty of fluids (water, clear soups, oral rehydration solution) to avoid dehydration from diarrhea.
• Wash your hands with soap and water after using the bathroom and before eating to stop the spread of infection.
• Avoid foods that make your symptoms worse, such as spicy or greasy foods, until you feel better.

Medical treatments

If a bacterial infection is found, your doctor may prescribe antibiotics. If a parasite is found, anti-parasitic medicines may be given. For inflammation or other bowel conditions, medications to reduce inflammation or control symptoms may be used. Always take medicines exactly as your doctor advises. Do not use over-the-counter anti-diarrhea medicines without checking with your doctor first.

Living with this condition

Once your stool test results are back, follow your doctor's advice. If an infection is found, you may need to stay home to avoid spreading it. Drink plenty of fluids and rest. For chronic conditions like inflammatory bowel disease, working with your doctor to manage symptoms can help you live well.

Lifestyle tips

• Practice good hand hygiene, especially after using the bathroom and before meals.
• Prepare food safely: cook meat well, wash fruits and vegetables, and avoid unpasteurized dairy when traveling.
• Keep a food diary if certain foods seem to trigger symptoms.

Diet and exercise

During recovery from an infection, stick to plain, easy-to-digest foods like bananas, rice, applesauce, and toast. Drink plenty of fluids. Once you feel better, a balanced diet with fiber (if not advised otherwise) can help. Gentle exercise like walking can support overall health, but rest when you feel unwell.

Mental health and emotional wellbeing

Digestive problems can be stressful and affect your mood. It is normal to feel worried, especially if symptoms last a while. Talk to your doctor or a mental health professional if you feel anxious or down. Many people find that understanding the cause and having a clear plan helps reduce worry.

Prevention

Some causes of problems that need a stool test can be prevented. Good hygiene, safe food preparation, and careful handwashing can reduce the risk of infections. Not all causes (like inflammatory bowel disease) can be prevented, but early detection through stool tests can help manage them better.

Vaccines

Vaccines are available for some infections that cause diarrhea, such as rotavirus (given to babies) and cholera (for travel to high-risk areas). Ask your doctor or local health service if you need any travel vaccines.

Screening programmes

Stool tests are also used for screening. For example, a faecal occult blood test (FOBT) is used to check for hidden blood as part of routine colorectal cancer screening. This is usually offered every 2 years in many countries for people aged 50 to 74. Speak to your healthcare provider about when you should be screened.

Complications

If left untreated

• Dehydration, especially from prolonged diarrhea
• Spread of infection to others
• Worsening of underlying conditions like inflammatory bowel disease
• Delayed diagnosis of serious conditions like colon cancer

Long-term outlook

Most stool test results lead to a clear diagnosis and effective treatment. For infections, symptoms often improve within a week with proper care. For chronic conditions, long-term management can help control symptoms and maintain a good quality of life. Early detection through stool tests is key to better outcomes.

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