Lactose Intolerance Test

Lactose Intolerance Test

An increasing number of people suffer from problems with intolerance to milk and milk products, in particular to lactose (milk sugar). The cerascreen® lactose intolerance test would like to support you on your path to a healthy future without complaints.

To achieve this, we measure the concentration of hydrogen (H2) and methane (CH4) in your exhaled breath. This TÜV certified measurement procedure guarantees a reliable and exact evaluation in a diagnostic laboratory and a very detailed results report.

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Determine a lactose intolerance conveniently at home

  • detailed results report
  • free analysis in the specialist diagnostic laboratory
  • pain-free and easy to perform (measured in your exhaled breath)
  • only takes a few minutes
  • no stress from a visit to the doctor

Please note that the test is not suitable for children.

What is lactose intolerance?

Lactose intolerance is an intolerance to disaccharide (polysaccharide) lactose, milk sugar. This consists respectively of a molecule of the monosaccharides glucose and galactose.
Lactose has to be split into its monosaccharides for processing in the small intestine. The enzyme lactase, which is found in the villi of the small intestine, is responsible for this function. Only the monosaccharides can be metabolised by the sodium dependent SGLT1 - transporter in the various sections of the intestine.
Depending on the residual activity of the enzyme lactase, the degree of severity of lactose intolerance can differ greatly and the symptoms are correspondingly distinctive.
If the milk sugar is not or only partly split by the digestive enzyme lactase and if larger amounts of milk sugar reach the lower sections of the intestine populated by bacteria, the lactose becomes nutrition for the bacteria. Large amounts of gases and fatty acids are created, which leads to complaints.
Lactose intolerance should not be confused with a milk protein allergy. In contrast to an allergy, in which the immune system is involved and the corresponding antibodies are formed, lactose intolerance arises from a deficit or insufficiency of enzyme production without the involvement of the immune system.
Approximately 15-20 % of the total population in Germany is affected by lactose intolerance. There is a North-South divide in Europe.

Which complaints can occur?

If the milk sugar is not or only insufficiently split by the digestive enzyme lactase in the small intestine, larger amounts of the undivided lactose reach the lower sections of the intestine populated by bacteria and ferment there.
Large amounts of hydrogen, methane, carbon dioxide and short-chain fatty acids are subsequently created, which leads to complaints.
The hydrogen or the methane are not the cause of the complaints but the formation of carbon dioxide and fats.
The typical symptoms arise from gas formation and fats. The large amount of carbon dioxide causes flatulence. This can be eliminated via the large intestine. In contrast, in the small intestine the gas is transported through the intestinal wall, passes to the blood and is expelled through the lungs. This procedure is extremely uncomfortable and can also cause bad breath.
The fatty acids carry water into the intestine, which causes a dilution of the stool and leads to diarrhoea. Bowel sounds are caused by the increase in intestinal movement. The change in consistency of the stool is explained by the increase in proportion of fatty acids, so-called fatty stools, or the increased inclusion of gases.
Other symptoms are possible in connection with lactose intolerance. These include heartburn and fatigue as well as migraine attacks.

Your individual test result

One click to know everything: We present the evaluation of your cerascreen® tests in our online customer area - of course password-protected for maximum security! In your individual expert report, you will learn which substances have a negative effect on your performance and thus restrict you in everyday life.

Note: The referenced values in the report refer to adults.

How the lactose intolerance respiratory gas test works

Certified laboratory and quality management

cerascreen laboratory

At cerascreen® , we have carefully selected trusted laboratory partners, such as DST Diagnostic Systems & Technologies, who have specialised in holistic human diagnostics for over 10 years and are located in Schwerin, Germany. The cerascreen concept is based on the long-standing experience of DST Diagnostic System & Technologies in human diagnostics along with the expertise and advice offered by experienced health specialists across various disciplines throughout Europe.


  • DIN EN ISO 13485
  • interlaboratory test

The lactose intolerance test kit consists of

cerascreen lactose intolerance test unboxed

  • several pages of illustrated instructions, explaining step by step how a sample of respiratory gas is taken and how the test is performed
  • activation card with test ID for registration
  • sample collection kit
  • a return bag, which you can use to send your respiratory gas sample back to our laboratory via post free of charge

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£59.00 including VAT
£59.00 including VAT