Hydrogen Breath Test for Lactose Malabsorption

What Is Lactose Malabsorption, and How Will This Study Help Me?

Lactose is a sugar found in many dairy products. Many otherwise healthy adults can have impaired digestion of lactose for a variety of reasons. This can lead to symptoms such as gas, bloating, and diarrhea. This test is performed to see whether your symptoms could be due to the malabsorption of lactose.

How Is the Test Performed?

The morning of the test, you will be asked to blow into a bag to collect a sample of your breath. After that you will be given a liquid to drink that contains lactose. You will then be asked to blow into a different bag every 30 minutes for the next 3.5 hours. You will also be asked to report any symptoms you are experiencing during the test.

Note: Please allow up to four hours at the testing center. You will not be permitted to smoke, exercise, or lie down/sleep during the exam as these activities can affect test results.

What Do I Need to Do to Prepare?

Proper preparation is extremely important for this type of testing to be accurate. Please follow these instructions carefully:

Starting two weeks before your test:

  • Do not have a colonoscopy within two weeks for your test.
  • Avoid all antibiotics.
  • Avoid all probiotics, including medications (e.g., Align, Culturelle, Florastor, Sustenex) and probiotic-rich foods (e.g., Yogurt, Kefir, sauerkraut, miso, tempeh, kimchi).

Starting three days before your test:

  • Avoid the use of laxative medications or stool softeners (e.g., Colace, Lactulose, Miralax, Senna).

Starting one day before your test:

  • Stop using all medications related to your GI tract, i.e., any medication used for acid suppression, abdominal pain/spasm, diarrhea, or constipation.
  • Try to eat only bland meals. Do not eat bread, potatoes, pasta, broccoli, cauliflower, beans, nuts, onions, leeks, garlic, tofu or soda.
  • Stop eating at 7 p.m. The night before your test. You may still take your necessary medications with water up until one hour before your test.

Starting the morning of your test:

  • Brush your teeth regularly. Use mouthwash if you have it.
  • Stop smoking at least one hour prior to arriving at the testing center.
  • Do not exercise prior to arriving at the testing center.

Please follow these directions carefully. If you need to cancel or reschedule your procedure, please call 860-679-3238 at least 48 hours in advance.

Test results are typically available to your doctor within one week.