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How is it diagnosed?

Written by : DoctorNDTV Team

Diagnostic tests to find the cause of diarrhoea include the following:

  • Medical history and physical examination. The doctor will need to know about the eating habits and medication use and will examine for signs of illness.
  • Stool culture: Lab technicians analyse a sample of stool to check for bacteria, parasites, or other signs of disease or infection.
  • Blood tests: Blood tests can be helpful in ruling out certain diseases.
  • Fasting tests: To find out if a food intolerance or allergy is causing the diarrhoea, the doctor may ask one to avoid lactose (found in milk products), carbohydrates, wheat, or other foods to see whether the diarrhoea responds to a change in diet.
  • Sigmoidoscopy: For this test, the doctor uses a special instrument to look at the inside of the rectum and lower part of the colon.
  • Colonoscopy: This test is similar to sigmoidoscopy, but the doctor looks at the entire large intestine.

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