Is there a Test to Confirm if you are Lactose Intolerant?

[Bestwishes]

Hi, I feel ok when I drink milk. When I eat pizza, afterwards for the next hour I will breathe out a cheese smell through my nose while my mouth is closed. I am a little gassy the next day if I eat alot of cheese. The last two times I ate at taco bell, (the food had alot of cheese and sour cream), I felt like i had bb after. I had it last week, and even after brushing teeth/tongue well I felt like a disgusting person for the the next two hours, breathing out dairy smells.

I am wondering how do you know if you are lactose intolerant? Is there an official test you can take to cofirm it? Thanks

[sadman]

Two tests are commonly used to measure the digestion of lactose.

Hydrogen Breath Test. The person drinks a lactose-loaded beverage and then the breath is analyzed at regular intervals to measure the amount of hydrogen. Normally, very little hydrogen is detectable in the breath, but undigested lactose produces high levels of hydrogen. Smoking and some foods and medications may affect the accuracy of the results. People should check with their doctor about foods and medications that may interfere with test results.

Stool Acidity Test. The stool acidity test is used for infants and young children to measure the amount of acid in the stool. Undigested lactose creates lactic acid and other fatty acids that can be detected in a stool sample. Glucose may also be present in the stool as a result of undigested lactose.