To be able to have a 'special diet' (or be taken seriously), my
daycare needed a  doctor's note saying they had food
allergies/sensitivities. I also needed to write a note. This doesn't
apply to elementary school lunches, but it may apply at snack or
party times. Our pediatrician specializes in genetic defects, and
happens to have food sensitivities herself, so she was sympathetic to
the problems and approved tests, while the allergists in our clinic
(2 floors up) don't recognize (more minor) food allergies
(sensitivities), unless you land up in the hospital. Unfortunately,
since your child is growing well, you may need to be persistent to
get tested. Since he gets hives upon touching milk, you may get
accurate results with the skin prick, tho, it's a bit less painful to
get the RAST or ELISA blood tests. Don't have him have any
antihistamine w/in 3 days prior to the tests, it may negate the
results. one of the allergy sites has a doctor search (Allergy and
asthma network / Mothers of asthmatics)
http://www.aanma.org/physrc.htm
..
.