Fructose Malabsorption Test



Fructose can be present naturally in foods such as fruit and some vegetables, or found in many processed foods and drinks. Foods that contain fructose include oranges, apples, mangos, pears, prunes, melons, raisins, honey and fruit juices. Fructose malabsorption occurs when the small intestine fails to fully absorb this sugar. As a result, fructose is transported to the colon where it is broken down by bacteria in the colon. Hydrogen, methane and carbon dioxide gases are produced as a result of this malabsorption.

Some people can tolerate more fructose than others, so symptom severity can differ depending on the amount of fructose consumed. Symptoms include bloating, diarrhoea, constipation, nausea, or abdominal cramps. People with Coeliac disease and IBS are at a higher risk of suffering from fructose intolerance. The Hydrogen and Methane breath test measures the gases produced by the bacteria in the colon to determine if the fructose sugar has not been absorbed properly in the intestine. This test is only performed in the clinic.

Please note that if you are on a long term antibiotic prescription, please contact us for testing advice. A pre-procedure instruction sheet can be viewed by clicking the download button below. This should be viewed and adhered to upon booking your appointment to ensure accurate results.

A copy of your results will be forwarded to your G.P/Consultant. In the event of a positive Hydrogen & Methane Breath Test, it is recommended that you see your G.P/Consultant for appropriate treatment.


Test Duration: Up to 3 hours

Testing Age: Over 16

Referral: No referral required

Results: Available on day for clinic investigations

Clinic Test Fee: €140