Two tests that are ran at a clinic or hospital room are a hydrogen test and a lactose tolerance test. There is also a stool acidity test that can also be done. A hydrogen test starts with your doctor giving you a liquid that you drink that contains lactose. After taking the drink, your doctor will measure the levels of hydrogen in your breath. But why does your doctor measure the hydrogen in your breath? When one cannot digest lactose, hydrogen and other gases start to ferment in the colon. When the hydrogen and other gases are fermented in the colon, they travel up to the intestines that later exhaled. The more amount of hydrogen found in your breath means that you are lactose intolerant.
The second test is called the lactose tolerance test. It measures how tolerant someone is. In this test, you will also be given a drink containing lactose. After two hours of taking this drink, you will be taking several blood tests. With the blood tests, your doctor will measure the glucose in your sugar. If your glucose level rises, then your body is digesting lactose, if not, then you are not digesting lactose properly.
The third test is called the stool acidity test. A doctor takes a stool sample and tests the lactic acid that fermented lactose that is not yet digested creates. This test is usually used for children or infants who cannot take the other tests.
Consider all of the possible tests mentioned here in Part II and in Part I if you think you may be lactose intolerant. It is important to know if your body is not properly digesting lactose. You will avoid lots of painful surprises after eating a pint of your favorite ice cream.