What is a lactulose hydrogen breath test?
The lactulose hydrogen breath test is used to identify abnormal growth of bacteria in the intestine. You will be asked to breathe into a breath collection device and your breath will be collected and analyzed for the presence of hydrogen.
Normally, small amounts of bacteria are found in the intestine. If there is a significant increase in the amount of bacteria, food and nutrients are not absorbed properly. Bacterial overgrowth can result from a slow transit of food through the bowels or from certain medications. Symptoms may include abdominal pain, bloating, gas, and diarrhea.
What are the possible complications with this test?
Complications of a lactulose hydrogen breath test are rare.
How do I prepare for this test?
- Antibiotics must be completed 2 weeks prior to this test.
- Avoid slowly digesting foods (bran, coarse breads, nuts, beans and vegetables) 1 day before the test.
- Do not have anything to eat 12 hours before you exam. You may only have water before the test.
- On the day of the test, do not smoke, sleep, or exercise vigorously for at least ½ hour before or at any time during the test.
- Be sure the medical staff is aware of any recent antibiotic therapy since it can affect the test.
What should I expect during the test?
First, you will collect a baseline breath sample by breathing into the collection device. Then you will drink a solution of lactulose. Then, every 20 minutes for a 2 hour period, you will breath into the device. You will collect a total of 10 breath samples. Please allow 3 hours for the test.
What should I expect after the test?
Breath test samples must be returned/mailed within 3 days of collection. You will be able to resume your normal activities and diet. Your doctor will send you the results by mail in 10-14 days after your test is received. If the test indicates that you do have small bowel bacterial overgrowth, it may be treated with antibiotics.
Lactulose Breath Test Kit Instructions