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How do I know if I'm lactose intolerant?

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Two common tests for lactose-intolerance in adults are:

For babies and young children, doctors can also take a stool sample.

  • Breath test, which will show if you have high levels of hydrogen when you exhale. If you do, you might be lactose intolerant.
  • Blood test, which can show how your body reacts after you drink something with a lot of lactose. However, this test is not usually done.

From: What Is Lactose Intolerance? WebMD Medical Reference

SOURCES:

Cleveland Clinic: “Lactose Intolerance.”

Mayo Clinic: “Lactose intolerance.”

Johns Hopkins Medicine: “Lactose intolerance.”

National Institutes of Health: “Lactose intolerance.”

National Institutes of Health:  “Evolution of lactase persistence: an example of human niche construction.”

Reviewed by Melinda Ratini on May 08, 2019

SOURCES:

Cleveland Clinic: “Lactose Intolerance.”

Mayo Clinic: “Lactose intolerance.”

Johns Hopkins Medicine: “Lactose intolerance.”

National Institutes of Health: “Lactose intolerance.”

National Institutes of Health:  “Evolution of lactase persistence: an example of human niche construction.”

Reviewed by Melinda Ratini on May 08, 2019

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How is lactose intolerance diagnosed?

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THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

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