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.
Each one of these 4 neurotransmitters in this list is associated with a link that will take you further down the ADHD neuronal/glial communication path.
Is someone trying to fool you with ADHD meds? Is that what you thought when meds didn't work as anticipated, and your ADHD recovery journey unexpectedly changed?
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.