Usually they will do either an elmination test or a hyrdogen breath test. The principle being the hydrogen breath test is that when the gut reacts, it produces hydrogen, which it wouldnt normally produce. An elimination diet can be used in conjunction with a skin pr!ck test. If the skin pr!ck comes negative for allergic reaction but there is still some sort of dietary rection then it is more likely an intolerance.

Lactose intolerant bubs will usually have pea green Diahorreah. They may also have vomitting and reflux, but vomitting and reflux can be unrelated, and are often mis diagnosed as LI when the diahorreah is not present. She will also act like she has a belly ache. She will also struggle to gain weight on any dairy based formula that has not had the lactase enzyme added (Karicare De-lact and S26 LF).

We did the elimination diet and the skin pr!cks, Elimination was around 14 weeks old and skin pr!cks were at 12 months. We can still tell just by the reaction what has hidden dairy.