Lactose Intolerance Test

  • Lactose Intolerance Test
  • Lactose Intolerance Test
  • 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 can help you reach your goal of living healthy and symptom-free.

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 by a diagnostic laboratory and a very detailed results report. Receive your results 2-3 business days after the sample arrived in the laboratory.

Please note that the test is not suitable for children.

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Test for lactose intolerance conveniently at home

What is lactose intolerance?

Lactose intolerance is an intolerance to disaccharide (polysaccharide) lactose or 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 vary correspondingly. 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 then feeds the bacteria. This creates large amounts of gases and fatty acids, 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 Great Britain 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. Neither the hydrogen nor methane but rather the formation of carbon dioxide and fats are what cause symptoms. 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 headaches.

Your personal test results

Sample Report

As soon as your sample has been evaluated, you will be able to view your individual results report in the my cerascreen® mobile app or our secure online customer area where you can also print the report.

Result of laboratory analysis: You will learn the concentration of hydrogen and methane in your breathing gas - before and after drinking a lactose solution.

Individualised practical recommendations: You will learn how to optimize your diet in case of a lactose intolerance.

Important health information: Read what happens with a lactose intolerance in your gut and what foods you can easily consume.

View Sample Report

How the lactose intolerance respiratory gas test works

Certified, reliable and accurate

cerascreen laboratory

We focus on delivering trustworthy and accurate results by working with the best accredited and certified laboratories that regularly participate in interlaboratory proficiency testing. Our goal is to always ensure a high level of quality and competency. All our partners are laboratories that provide extensive experience and are trusted as well as utilised by physicians all across Europe. Our setup of using anonymous Test-IDs ensures maximum data protection and privacy.

We use the highest certification standards for quality management:

  • ISO 9001
  • EN ISO 13485
  • Interlaboratory proficiency testing

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
  • Disinfection cloth, swab, plaster, 2 lancets CE 0344, blood collection tube, transport tubes
  • Pre-addressed and pre-paid return mailing envelope, which you can use to send your respiratory gas sample back to the laboratory free of charge using Royal Mail

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