Sucrose Malabsorption Test



Sucrose is normally broken down in the small intestine by the sucrase enzyme. When Sucrose Malabsorption occurs, the sucrose is not properly broken down or absorbed in the small intestine. It travels to the colon where it is metabolised by colonic bacteria. Sucrose is also known as table or cane sugar.

Some people with genetic sucrase - isomaltase deficiency (GSID) are often misdiagnosed with IBS. People with GSID cannot digest sucrose and maltose (sugar found in grains) and can have difficulty digesting starch. Symptoms range from mild to severe.

The Hydrogen and Methane breath test is performed to test for sucrose malabsorption. This is a non-invasive test that is 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 years

Referral: No referral required

Results: Available on day for clinic investigations

Clinic Test Fee: €140