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 leading to gastrointestinal upset.
The Sucrose Malabsorption test can be done in clinic or the test can be perfomed at home using a home testing kit.
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Symptoms of Sucrose Malabsorption
What is Sucrose Malabsorption?
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 non-invasive and is performed to test for Sucrose Malabsorption.
How it Works
Choose home or clinic testing
This simple, non-invasive diagnostic test can be performed at home or at one of our clinic locations. For home testing, you will receive a full kit with easy-to-follow instructions.
Drink the testing solution
You will consume a sweetened testing drink as part of the test.
Collect timed breath samples
Only breath samples are required, collected at timed intervals after the drink. No blood samples are necessary.
Gases pass into the bloodstream
As the drink passes through your digestive tract, gases are produced depending on how it interacts with your digestive system. These gases pass from the gut into the bloodstream.
The gases are measured in your breath
When your blood reaches your lungs, these gases pass into the air you breathe out and can be detected in your breath samples.
FAQ
What is the sucrose malabsorption test?
The sucrose malabsorption test is a non-invasive breath test used to assess how well the small intestine breaks down and absorbs sucrose. It measures hydrogen and methane gases in the breath after ingesting a sucrose solution.
What is sucrose malabsorption?
Sucrose malabsorption occurs when the body has difficulty breaking down sucrose (table sugar) due to reduced activity of the sucrase enzyme in the small intestine. Undigested sucrose passes into the colon where it is fermented by gut bacteria, producing gas and digestive symptoms.
What symptoms might indicate sucrose malabsorption?
Symptoms may include:
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Bloating
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Abdominal discomfort or cramping
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Excessive gas
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Diarrhoea
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Nausea
Symptoms typically occur after consuming foods high in sucrose.
How is the sucrose malabsorption test performed?
After completing the required preparation diet, a measured sucrose solution is taken as part of the test. Breath samples are then collected at regular intervals over the test period to assess gas production during digestion.
How accurate is the sucrose malabsorption test?
When preparation guidelines are followed correctly, the sucrose breath test is a reliable tool for identifying sucrose malabsorption. Results are interpreted alongside reported symptoms to support accurate clinical assessment.
Do I need to stop medication before the test?
Yes. Certain medications and supplements can affect results. For the full list of instructions click on the View Instructions link on this page.
How easy is the sucrose malabsorption test to perform at home?
The test is simple to perform at home using the kit provided. Clear instructions are included, breath samples are collected using breath collection bags and no clinic visit is required. The process is non-invasive.
How long does the test take?
The sucrose malabsorption test takes 3 hours, during which breath samples are collected at set intervals.
Can this test help identify sucrase deficiency?
Yes. An abnormal result may suggest reduced sucrase enzyme activity and can help guide further clinical investigation and dietary management.
Who should review the results?
Results should be reviewed with your G.P., Consultant, or Dietitian, particularly to guide dietary changes such as a low-fructose or low-FODMAP diet. Please note that GastroLife is a testing centre and undertake the test only.
Is the test suitable for children?
The minimum age for Sucrose Malabsorption testing is 16 years old.
Test Details
- Test Duration
- Up to 3 hours
- Testing Age
- Over 16 years
- Referral
- No referral required
- Results
- Approx. 3-4 working days
- Clinic Test Fee
- €200
- Home Test Kit Fee
- €185
Sucrose Testing Advice
Please note that if you are on a long-term antibiotic prescription, please contact us for testing advice.
Sucrose Pre-Procedure Instructions
A pre-procedure instruction sheet can be viewed by clicking the link below. This should be viewed and adhered to upon booking your appointment to ensure accurate results.
View InstructionsSucrose Home Test Kit Contents
- 7 ×Pre-labelled breath collection bags
- 14 ×Blue air stopper caps
- 1 ×Testing substrate
- 1 ×Plastic clamp
- 2 ×Mouthpieces
- 1 ×Pre-labelled return envelope
- 1 ×Test Instruction Book
- 1 ×Consent Form
Shipping and T&C’s
Breath Test Planner
Download a timing planner for your Hydrogen & Methane Breath test.
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