Non-Invasive Breath Test

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If you suffer from abdominal discomfort such as bloating, gas and irregular bowel habits, a non-invasive breath test can help discover the cause.

The procedure analyses gasses present in the breath to diagnose lactose or fructose intolerance. It can also ascertain if you may be living with small intestinal bacterial overgrowth (SIBO).

SIBO occurs when there are too many bacteria present in the gut. It is tested by measuring levels of methane and hydrogen in the body. The gasses are a byproduct of metabolic breakdown of food in the body by bacteria in the gastrointestinal system.

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The Procedure

To gain an accurate test, you must refrain from certain medications and activities before visiting the clinic. This includes avoiding drugs like antacids and antibiotics for up to four weeks beforehand. 

You will also be asked to eat a plain diet on the day before testing, refraining from eating for 8-12 hours before the test. Dr Bansi will provide detailed advice and guidance.

The test begins with a short initial breath sample. You will then be given a drink containing various types of sugar and asked to repeat the test every 15-20 minutes over 2-3 hours.

It’s a painless, non-invasive test, but it does take considerable time to complete. Many patients like to bring a book, puzzle or tablet to keep them occupied during the procedure.


The breath test requires no surgery, anaesthesia or sedation. You can resume normal activities straight after leaving the clinic.

This is one of the reasons why non-invasive breath testing is the most popular form of diagnostic procedures in cases of suspected lactose intolerance, fructose intolerance and SIBO.

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From well-equipped and convenient locations across West and central London, Devinder and his expert team provide unparalleled quality of care for the full range of GIT-related conditions.