Diagnosing Lactose Intolerance

Hydogen Breath Test
Patient taking the hydrogen breath test to check for Lactose Intolerance.

There are two primary methods to identify whether you suffer from lactose intolerance.

Method #1: Hydrogen Breath Test

Your physician (or you may go to a gastroenterologist) can elect to administer a hydrogen breath test. A hydrogen breath test determines whether you are "lactase deficient.” The picture on the right demonstrates how the hydrogen breath test is administered.

This test is simple to take. Your doctor will have you drink a mixture containing lactose and then take a sample of your breath via a breath analyzer every 30 minutes for about 3 to 4 hours.

While this test is a good measure of your lactose intolerance,it does take a few hours to administer. Also note, as part of the test you will be drinking lactose, so if you are lactose intolerant you will most likely experience symptoms from the test.

Method #2: Milk Test

A simple in-home test involves taking a challenge of milk.

Step 1: Avoid all dairy products for 24 hours. (be sure to check labels for ingredients like whey)

Step 2: The following morning, drink 12 ounces of milk without a meal for breakfast.

Step 3: Over the next 6 hours, pay attention to any discomfort. If you experience any symptoms such as gas, cramps, bloating or diarrhea there is a high likelihood that you are lactose intolerant.

We would recommend that you speak to your physician prior to administering the milk challenge and about your results for an official diagnosis.

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