We've just been through this with our 8 year old.
We told her that her dad and I thought that her life seemed a bit harder than it should be compared to other kids, and that we were going to talk to someone who could see how they could make her life easier. We'd had other conversations with her along these lines over the last six months, trying to work out what the issue was.
She also seemed to like the concept that the psychologist was going to try to 'get into her brain' and find out how she ticked.
She has a very short attention span, among other issues. I also told her that if we could help her concentrate better, it would help her to be better at gymnastics, which is something she loves. I've been very careful not to put any labels on her (not that I have a clue what's up with her yet!) but at her age she seems to be aware that something's just not quite right.
She was very happy with the explanation, and happily went through the testing process on Tuesday. After the testing, she had lots of questions, and we've been sure to answer them as truthfully as we can.
The assessment was quite thorough, and we're now waiting for the report from the psychologist.
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Me 47; DH 56
DD1 22/8/03 (after 3 cycles of clomiphene)
DD2 24/4/06 (IVF)
DS1 02/6/11