I remember first being referred to the geneticist (at St. Helier, my local hospital) and feeling relieved that we/I might finally get an answer for my DD.
She was nearly 3 and the geneticist we saw thought she knew 'what' she had and called in another geneticist who speciaised in this other condition. This 'specialised' geneticist diagnosed my DD by her visual appearance.
Luckily they had blood stored from my DD so didn't have to take blood again, but they did take blood from my (ex) husband and myself to make sure we were not carriers.
I remember leaving the hospital with the verbal diagnosis (whilst waiting for the blood diagnosis), I then read all about the syndrome (Sotos) and for once recognised my daugther.
When we finally got the results through, I was a bit upset seeing it in black and white but wasn't really shocked.
Within 2 weeks of getting the verbal diagnosis, I joined a charity that helped and supported Sotos Syndrome (Child Growth Foundation - deals with overgrowth and undergrowth in children) and I attended a conference that same month. The geneticist that verbally diagnosed my DD did a talk on the condition and she was so specialised, I realised that if she had diagnosed my dd visually, then she more or less definitely had Sotos (delayed development and overgrowth).
I am now off to the CGF conference again this weekend in Northampton (I live in Surrey). This will be my 4th conference (missed last year as was on holiday).
For me, finally seeing the geneticist finally crossed all the t's and dotted all the i's (if that makes sense).
Hope you get the answer you are looking for, if it is answers that you want.