The SIBO test is recommended if  you suspect a bacterial overgrowth in the small intestine. According to studies, as many as 80-85% of people with IBS have been shown to have bacterial overgrowth in the small intestine. Examples of symptoms are flatulence, bloating, abdominal pain or cramps, diarrhea and/ or constipation. SIBO is a breath test that measures the levels of hydrogen and methane after drinking a small amount of lactulose.

yesAt-home test without need for a doctor’s visit

yesClinically approved test that is analyzed by an ISO 15189 certified lab

yesComprehensive result report in English

yesFast results

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Psst… If you buy more than 1 test, you get a discount on the entire order. If you buy 3 tests, you get up to 10% discount. The discount is deducted automatically.

About SIBO

The SIBO test is recommended if  you suspect a bacterial overgrowth in the small intestine. SIBO occurs when there is an increase in the bacterial population in the small intestine. These bacteria produce various degradation products such as hydrogen, carbon dioxide and short-chain fatty acids, which give rise to various gastrointestinal problems.

There are different types of SIBO that are often tested and it is important to know what kind of SIBO you have as the different types require different types of treatment methods. It is common to have several different varieties, but where one of them is more dominant. Our test analyzes the presence of methane gas (where different bacteria and microbes create gases) and hydrogen gas (where the bacteria ferment carbohydrates and create different types of gases), and these are usually seen as the most common types of SIBO.

Symptoms of SIBO

SIBO has been theorized to be a possible cause of IBS. People diagnosed with IBS can benefit from testing for SIBO as studies have shown that almost 80% of these people have an overgrowth of bacteria in the small intestine. Bacterial overgrowth in the small intestine can create  problems such as:

  • Flatulence
  • Abdominal swelling
  • Abdominal pain or cramps
  • Diarrhea
  • Constipation

If SIBO is left untreated, it can eventually lead to more problems such as leaky gut, depression, headaches, food intolerances, acne, fatigue or autoimmune reactions.

Who should test for SIBO

People with IBS, people who have difficulty breaking down carbohydrates, those with gluten intolerance / celiac disease and people who experience any of the above-mentioned symptoms, are considered suitable to test for SIBO.

However, there are other intestinal imbalances such as fungal overgrowth that can cause similar problems such as SIBO. Other gut health tests that might be of interest could be the Candida test if you also want to analyze the possible presence of yeasts, or our largest intestinal test Gut Microbiome Test XL if you are interested in making doing a thorough test of your gut.

SIBO – how to perform the test?

SIBO is a breath test and includes 15 ml of lactulose liquid. The test measures the levels of hydrogen and methane in the exhaled air on several occasions during the day after ingestion of lactulose. This will tell if there is a bacterial overgrowth in the small intestine. You carry out the test yourself at home and then send it to our lab for analysis. You get the answer digitally.

Your test report for SIBO

The report includes recommendations on how you can proceed to treat your imbalance, in case you have a bacterial overgrowth.

SIBO is an abbreviation of Small Intestinal Bacterial Overgrowth.

Important to consider before taking the SIBO test

In order for the test not to give a false result, we ask you to carefully follow our recommendations and avoid the following:

– Wait at least four weeks if you have recently undergone antibiotic treatment, colonoscopy, barium studies, barium enemas or have had diarrhea.

– Avoid using laxatives, laxatives and / or laxatives as well as acid scavengers containing aluminum or magnesium hydroxide.

– Stop taking probiotics 48 hours before the test.
– Foods that you CAN eat before starting your 12 hour fast: Baked or fried chicken, fish or turkey (salt and pepper only), white bread (only), plain steamed white rice, eggs, clear chicken or beef broth without vegetable pieces. Vegetarians can eat tofu with salt and pepper.
– You can only drink plain water, coffee and tea (without sugar, artificial sweeteners, milk or cream).

– The last 12 hours are the fasting period. Ingest NOTHING except water for 12 hours before and during the test.
– Unless otherwise instructed by your doctor, do not take unnecessary medicines or supplements until the test is completed.
– Do not chew gum, do not eat sweets and do not use mouthwash until the test has been completed.

– NO smoking (including passive smoking) for at least one hour before or at any time during the breath test.
– NO sleep or strenuous exercise for at least one hour before or at any time during the breath test.
– Do not use toothpaste.

Additional information

Weight 0,030 kg


You take the test yourself at home through a breathing test. Your sample will be collected in a couple of hours. Your sample is then sent to our lab for analysis and you will receive your answer digitally as soon as the lab has analyzed your sample.

Remember to avoid eating or drinking anything that contains the substance you are testing, that is, if you are testing lactose, you should avoid lactose intake and if you are testing fructose, you should avoid consuming fructose.

  1. Make a purchase on the website and pay with Swish or card (Visa, AMEX or Mastercard). Easy and safe.

  2.  A test kit is sent to the address you enter when ordering. After your order, we will send home a test kit with instructions. It also comes with a stamped envelope that is mailed to us. It is recommended to send in your sample on a Monday or Tuesday.

  3. Carry out the test according to the instructions included in your test kit and on the web. Our Support can also answer all possible questions, before and after submissions and results.

  4. Send the test kit to our ISO certified lab and wait for results digitally. You will normally receive an answer within 15 working days after our lab has received your sample.

For more detailed instructions, see here under the category “Breath test“.


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