Doctors offices do not test for everything. The problem is not knowing specifically what to test for. Have you had an extensive fungal blood culture test done? It might be hard to get a doctor to prescribe it, though. A really helpful blood test coming up for me might be the micronutrient blood test to see which nutrients I am deficient in. I am not sure how helpful it will be for EC, but if my immunity is low due to nutrient deficiency, I will know which vitamins or food to focus more on to boost my immunity.