Is this IgG test a blood test? If so, can any general family doctor run the test? Thanks in advance!
Yes, it is a blood test. However, the basis for using IGG levels as a means for diagnosing food-intolerance's has not been scientifically proven. So you average doctor may be uninterested in, or not familiar with the test.
I agree with StephanieL, in that the only reliable way to determine a food-intolerance is by eliminated the food for a few weeks, and then reintroducing it, and observing how you respond.
Here is a quote taken from Genova-Diagnostics, a leading provider of the IGG tests:
If you were on steroidal anti-inflammatory drugs or if you were not consuming a tested food, the test probably will not show a positive reaction. If you are already on an elimination diet due to known food reactions, a negative result on an IgG4 food antibody profile does not necessarily mean you can freely eat the food without experiencing symptoms. Reintroduce any previously reactive foods with caution.
It seems more likely IGG levels simply reflect the contents of your diet, not which foods you are intolerant to. Though, if one has a leaky gut, its quite likely they will have developed intolerance's to many of the foods they are currently eating. This is probably why some people find the test to be "effective".