You can probably find the criteria online.
Since you asked for it, I'll find it for you:

http://counsellingresource.com/distr...zophrenia.html

That is straight out of the DSM IV. Most clinicians in the US use that (and increasingly around the world). The ICD index is also sometimes used.

The presence or absense of symptoms needs to be diagnosed by a mental health professional. Sometimes people find it helps them make sense of their diagnosis, though.