How do doctors go about diagnosing PCOS?

I’m switching to a new doctor (1. Because I’ve moved to a new state and 2. Because my last doc told me there’s “no way to test” for PCOS and that I’m “probably fine” 🙄), and I was curious as to how they about about diagnosing it. How did y’all’s doctor diagnose you? Would love some feedback❤️.