I'm a phd. Md wants extensive panel. How are we to interpret results that are equivocal?

See below. As with most tests, you would initially want something with a high sensitivity and then high specificity. So you could do a confirmatory test or another related test to support your original hypothesis, depending on your predictive value (based on the clinical evidence & current literature).
Depends. Medical tests are designed to detect things above threshold - that is to say anything positive should be a cause for concern and if negative, probably will not lead to trouble. Equivocal results have to be interpreted in the light of all the other findings and symptoms and many are simply not important. Let your md be your guide in this.