Thanks Steve.

> The milk protein stays the same in almost all types of liquid dairy products. 
> 
> There's no reason to think that yogurt would react any differently on her 
> immune system or her digestive system. If the doctor wants milk for the 
> challenge, then it's probably the best way to proceed.

In that case, just one additional question.

If she has a GI reaction, how would we know if it is allergic in nature or due to lactose intolerance?