For those with children with an official Dyslexia dx- how was that done. What exactly was done (testing..ect..) to determine this.

We are concerned about my 8 yr old gt son. He has always been far behind with spelling, writing. He also is speeched delayed (going into the 3rd grade and still receives services through an IEP for speech- articulation issues). He did not learn his ABC until the summer before 1st grade and even then had a really rough time with it. Luckily he has caught up to reading at grade level this last year. But he still has lots of quirky things going on.
Examples: on a digital clock he can not tell the difference between 2's and 5's. When reading he still doesn't use all the correct words- will replace them with words that seem similar or uses the context of the story to place what word he thinks would go there.
We had him tested for learning disorders @ 2 yrs ago- but the psychologist said that it was to young to make any "official" dx- but thought there was something going on with him . He was leaning towards Auditory Processing Disorder (we just moved schools and his new school psych doesn't agree with this). We were thinking of having him retested soon- but what exactly do we ask for. Now that he is at grade level- no one seems to think that there is any issues- but he is still preforming way below his ability level. (according to a comparison between olsat and his achievement test- cant remember the name!)

Just want to make sure we give him every opportunity there is to preform and learn at his level. Would love to know how your child received there dx and any signs that made you think of getting them tested.

Thanks