Levantine I feel for you. My dd2 has been on waiting list for ADOS for over about 14 months. She was first referred to Paeds when she was 4 years old. She is now 8years old. School provides sufficient structure and routine and at present she copes well. However, she does now have an IEP in place because she struggles with anxiety and hypersensitivity to sound when under pressure (asked to write something, or write words in a spelling test for example, she can get all 'perfectionist' about things, demands silence in the class room and end up producing no work). Plus she is making slow progress with literacy and numeracy. She is upset at EVERY afternoon session in after-school club because child X or child Y did not do as she expected. She is good in adult 1-1 situations, particularly with new people, all interested, polite, compliant. With me last week on hols we had multiple tantrums, meltdowns, rudeness, unreasonable demands. All over and done with fairly quickly now because I handle them with acceptance and reduced demands as appropriate together with concrete language, visual aids, the 'Incredible 5 point Scale' and explicit teaching about social situations. dd2 has a history of poor eye contact, delayed and reduced reciprocal social communication and severely delayed and disordered language and some explicit rigid routines and inflexible thinking, striking problems with non-literal language (especially written). With me so far?
In the last week of term we had ADOS (paid for private ADOS as CDC waiting list is seemingly never ending). At private assessment (observation in school, at afterschool club, ADI-R and ADOS) assessor noted subtle but significant difficulties IN ALL AREAS of the triad (well it used to be a triad until recently) of impairments commensurate with ASD. But they did not meet the 'severity threshold' for a formal diagnosis. He considered a diagnosis of Social Communication Disorder but says she can't have this dx because dd2 shows restricted and repetitive interests/behaviour, yet she can't have a dx of ASD (going round in circles? Much?). He stressed that dd2 may well have met the 'severity threshold' at the age of 4 but she has made an awful lot of progress since (not least because of intense therapy with amazing private SALT and because 60% of her interaction at home is imitation of her very placid, compliant and mature elder sister).
We are living proof that just because you pay for an assessment you won't necessarily get a dx.
In the meantime we are left with 'significant impairments on an everyday level' but with no diagnosis. Primary school is a fairly protective environment. Like you, Levantine, my main aim of getting a dx now is so we don't have to go through the years of assessments and questionnaires (we must have done about 25 questionnaires) and endless waiting and musing on dd'2s subtleties and whether it's ASD or hearing problems, while dd2's self esteem takes a nosedive in secondary school. I want all the speculation over and done with and would like to channel my energy into just giving dd2 the help she needs, with Autism Outreach available for whatever paltry help they can give in the future.
I have my own issues with the way the ADOS is carried out and interpreted. I just have to put my faith that our CDC appointment will take a more pragmatic and holistic view and give her the diagnosis that I feel she needs. Hope yours does too. Very very best of luck for your ADOS, look forward to hearing that they have a good handle on your DS and that you get the result you need.