I empathize with you, as I was misdiagnosed with a sleuth of things and medicated as a teenager.
I don't think it's possible to diagnose someone the autism spectrum in 15 minutes; diagnosis typically take multiple visits and tests. It is possible that your PTSD presented similarly to ASD.

I'm not sure if you're saying that you were diagnosed with Asperger's a second time?

May I ask, are you upset about possibly being on the spectrum? Do you identify with the criteria for Asperger's syndrome?