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Painless hydrogen breath test for children to diagnose lactose intolerance, SIBO and food-related digestive symptoms. Shishuka Children's Hospital, Bangalore.
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A simple, completely non-invasive breath test that helps pediatric gastroenterologists diagnose lactose intolerance and other digestive conditions — no needles, no discomfort, just breathing into a collection device.
A hydrogen breath test measures the amount of hydrogen in a child's breath after drinking a specific sugar solution, such as lactose. Normally, sugars are digested and absorbed in the small intestine. But if a child's body can't properly break down a particular sugar, undigested sugar passes into the colon, where gut bacteria ferment it and produce hydrogen gas. This gas is absorbed into the bloodstream and eventually exhaled, where it can be measured in the breath.
Because it requires no needles, sedation, or invasive procedures, this test is one of the easiest and most comfortable diagnostic tools in pediatric gastroenterology, especially useful for investigating symptoms like bloating, gas and diarrhoea linked to specific foods.
A pediatric gastroenterologist may recommend this test if your child has:
Bloating or gas that consistently follows certain foods, especially dairy
Diarrhoea shortly after eating specific foods like milk or wheat
Recurring abdominal pain with a suspected link to food intolerance
Unexplained chronic diarrhoea not yet linked to a clear cause
Suspected small intestinal bacterial overgrowth (SIBO), often alongside bloating and irregular bowel habits
Symptoms that improve when a specific food is avoided
The specific sugar used depends on what condition is being investigated.
The most commonly performed version, used to diagnose lactose intolerance by checking how well your child digests the sugar found in milk and dairy products.
Checks for fructose malabsorption, relevant for children with symptoms linked to fruit, honey or high-fructose foods.
Used to detect small intestinal bacterial overgrowth, a condition where bacteria that normally live in the colon grow abnormally in the small intestine.
Used less frequently, to check for a rarer intolerance to sucrose (table sugar), particularly in children with unexplained chronic diarrhoea from infancy.
Here's how the breath test compares to other ways of investigating food-related digestive symptoms.
| Investigation | Invasiveness | Best For | Limitation |
|---|---|---|---|
| Hydrogen Breath Test | Completely non-invasive | Diagnosing sugar malabsorption & SIBO | Takes 2–3 hours; requires cooperation with breath samples |
| Elimination Diet | Non-invasive | Identifying a suspected food trigger over time | Slower; less precise than a breath test |
| Blood Allergy Testing | Minimally invasive | True food allergies (immune-mediated reactions) | Doesn't detect intolerances like lactose intolerance |
| Stool Testing | Non-invasive | Checking for infection or general malabsorption markers | Not specific to identifying a single sugar intolerance |
One of the simplest, most child-friendly diagnostic tests available.
Your child fasts for several hours beforehand and avoids certain foods the day before, since these can affect baseline hydrogen levels and skew results.
Your child breathes into a simple collection device or bag to record a starting hydrogen level before drinking the test solution.
Your child drinks a measured amount of the test sugar solution, and breath samples are collected every 15–30 minutes over roughly 2–3 hours to track hydrogen levels over time.
Results are usually available the same day. If intolerance is confirmed, your gastroenterologist will provide practical dietary guidance tailored to your child.
A comfortable, needle-free test that still needs careful preparation and clear interpretation.
Results interpreted in the context of your child's specific symptoms, not in isolation.
One of the least stressful diagnostic tests available for children, involving only breathing.
Detailed dietary and fasting guidance beforehand to ensure accurate, reliable results.
Actionable nutrition guidance if an intolerance is confirmed, not just a diagnosis.
Consultations available across Kalyan Nagar, RT Nagar, Malleswaram and New BEL Road.
There's no recovery time needed at all — since nothing invasive is done, your child can eat and go about their day as soon as the test finishes. Some mild bloating or a temporary tummy upset can occur during the test itself if the sugar isn't well absorbed, which is actually part of what confirms the diagnosis, and settles on its own.
Results are typically available the same day. If an intolerance is confirmed, your gastroenterologist will guide you on which foods to limit and how to manage your child's diet without unnecessarily restricting nutrition.
A simple breath test can bring clarity without needles or invasive procedures. Book a consultation with our pediatric gastroenterology team.
We've compiled a list of the most frequently asked questions to help you find the information you need quickly and easily.
“If you can't find the answer to your question here, please don't hesitate to contact our support team for assistance.”
No, completely painless — just drinking a sugar solution and breathing into a collection device.
2–3 hours, since breath samples are collected at intervals.
Yes, fasting plus avoiding certain foods the day before, since these can skew baseline results.
A rise in breath hydrogen after the test sugar suggests the body isn't digesting it properly, confirming intolerance or bacterial overgrowth.
No. Intolerance is a digestive issue causing bloating/diarrhea; allergy is an immune reaction that can be more serious, requiring different testing.