I am not an authority, so I can't answer that for certain. But, I am led to believe that a test from your doctor would have to be a specific test, looking for specific fungi. From what I understand, our medical laboratories are not adept at routinely isolating fungi from human tissue or fluid samples. The test he would typically prescribe generally would not pick up every/any fungi that may be causing you problems. As well, testing for those could be expensive. Thereby, experimenting with the antifungal diet would be a quick and inexpensive way to find out.