Allergists focus on traditional medical issues of acuity, life and death. IgG issues most often arise in the evaluation of chronic illness that often presents as refractory mental problems - like ADHD.
This deep but brief review by Camille F. J. Lieners PhD, Luxembourg, regarding the IgG controversy [Evomed Diagnostics] helps answer many questions about food testing.
Who cares about food immunity and ADHD? In fact, everyone should care, because food sensitivities, once understood, can spell treatment success or complete, ongoing ADHD treatment failure.
Just as when traveling in any new territory we need useful new maps to find the towns we will be visiting. Many of these towns show up on the map with names we haven't heard before - and those names can be down right intimidating - even to a psychiatrist: