question about food allergy test - ELISA test

[Guest guest]

The result for my son's ELISA test comes back. Pineapple came back

really high, then came the gluten... then cow's milk... yogurt...etc.

But cheddar cheese is none. I'm curious if anyone knows why he's

allergic to cow's milk (3) and yogurt (3) while he's not allergic to

cheddar cheese (0). They are all made from cow's milk. How do they

check, is it cow's milk is cow's milk itself, then yogurt is to check

whether you're allergic to probiotics and then cheddar cheese is to

check whether you're allergic to cultures..? I'm confused.

Now, I'm still giving him the 24-hr fermented cow's milk yogurt, maybe

I need to switch to goat's milk yogurt? Or if it is fermented 24-hr,

he is not allergic anymore because the lactose is gone?

Any suggestions?

Thanks.

Joanna.