Is there a correlation between the IgG level and the intensity of a symptom?

Is there a correlation between the IgG level and the intensity of a symptom?

No. The intensity of a symptom rather depends on the amount of the food consumed and on the type of tissue, its sensitization and ability to bind circulating immune complexes which result from the interaction of food and IgG. However, in case of an increased IgG level, you should avoid the respective food for a longer time to let the IgG degrade.