ime, the test used depends a lot on which paed you have administering it.
have you a had a confirmation on which paed will be attending?
we had a marvellous appt when dd1 was undergoing dx, where dh took the day off work and we all trooped off to the children's centre. we packed a lunch for dd1 (not easy as she is gf/cf, and doesn't eat sandwiches! we were new to gf too, so quite a PITA tbh)
we were then kept waiting for over an hour. I do understand that appts overrun, but we lived 5 mins form the centre. you'd think that someone would have let us know of the delay. dd1 was about 2 at the time, so didn't like waiting in the best of circumstances, never mind ASD issues!
we finally got into the appt to be faced with a list of developmental questions. when dh queried why they were being asked again (3rd paed appt, had always seen a different paed)) we were told that that was thepoint of the appt.
we were and said so. and asked why no assessment was being done. the answer? the paed was not qualified to administer.
we walked out and asked to be re-scheduled with a qualified paed, as we already knew there was an issue, and now needed some (any!) tests.
so maybe they can't answer your question, as the answer will very much be based on who is attending?
'tis crappy service though.