Well ds's appt goes as follows
see dr to discuss alleries/what to test for etc
wait to have skin pricks from nurse,you should tell the dr what you would like her to be tested for eg.eggs/dustmite/cats etc
skin oricks takes a few minutes then you wait for about 15 minutes to get them read,then you have to wait and see the dr again.
Usually takes us about 2 hrs in all
They can test for something only if they have a sample to use in the skin prick test,so for example they'll have all the usual stuff like nuts etc but may not have obscure things like hmmm can't think of an example/
hth