When I first went for diagnosis, I went to my university's SSDS, who told me that they could test me, but it would cost $1000. (Excuse me? I pay hundreds of dollars in service fees, so that you can charge me when I need you?) Needless to say, I declined. That's ridiculous money to expect from a student (!) who has a disability (!) and already funds the service with fees every semester (!).
Instead I got a referral from a campus clinic GP (who went through the Gilberg and DSM criteria to decide if she thought it was worth investigating) to a psychiatrist, who was free (due to student health services and insurance) and was able to give me a diagnosis and way more help than SSDS ever offered.