The only thing you can do is find out exactly what the pilot board is looking for in the way of a medical opinion.
Once you know what they need you can then, if necessary, consult with a private immunologist (make sure to supply your complete medical records for the consultants review) for an answer to the Boards questions.
The immunologist will know what, if any, tests would be required to answer the Boards inquiry.
Will this be a quick process?
I wish you the very best.
As a side my best friend from the 8th grade grew up to become a Captain with American Airlines and flew for them for almost 4 decades, finishing up driving 777's back and forth over the Atlantic......
I am happy to be able to help you today. If you would be so kind, please help me get credit for my efforts in answering your questions and press the excellent feedback button for this encounter. And, don’t forget, I work for tips. I would also be happy to continue to answer any more questions you have until we have resolved your concern.
Dr. Rick MD FACS