My DS was diagnosed with autism at the Evelina. It was several years ago now so I'm trying to remember exactly what happened. DS was around 8/9.
The whole process was very well handled and I felt we were really listened to by the professionals. DS had a positive experience too.
Our appointment was in the morning. It was quite early so we stayed in the Premier Inn nearby the night before (free breakfast for DS!).
We were shown into a room where there were three professionals. A consultant, a senior speech and language person and a child psychologist. We all chatted for a bit - I think they were 'getting the measure' of DS to see if they'd be able to work with him in a separate room without him getting too distressed. DS has always been much better with adults so after a little while, he was more than happy to go with the speech and language lady and the psychologist. They told him they were going for a chat and to play some games.
They took him into a room which was next door - there's a two-way mirror so you can see them.
The consultant then asked us LOADS of questions - stuff going back to when he was a baby. Things like 'did he crawl, if so when? When did he talk?' Lots of background information including family history of me and DH.
I think that went on for maybe an hour?
After that, DS was brought back in. We were then told to go downstairs for a coffee while they had a chat. After about half an hour, they called me on my phone to come back in.
I can still remember feeling sick - wanting the diagnosis but also not. I think DS was in the room at the time but he was playing. Maybe they offered to take him out? They told me 'we all agree that DS meets the criteria for a diagnosis'. They went on to explain why they'd reached that decision - pointing out some of their findings when they assessed him. It was really eye-opening! DS can be quite subtle in his presentation at times but they saw his difficulties/differences so clearly.
However, I also know of two families who didn't get a diagnosis on the day. In both cases there are other things going on (in terms of other genetic conditions) so I guess they had to have a think about it.
We were discharged by them on the day as that team only diagnose but a little while later they sent through a really detailed 5-page report of their findings. That was so helpful. It helped feed into our EHCP application.
We told DS straight after the appointment about his diagnosis as obviously at his age he wanted to know what was going on. He just shrugged and then asked if he could play on the slide. The Evelina has an amazing indoor slide!
Good luck to you both. I remember what an incredibly anxious and difficult time it was.