Apparently this may be changing in the new DSM criteria, except it hasn't been validated yet, torefelect that some kids with AS still have somelanguage issues- 'absence of developmental delay' doesn't do it justice.
Theya re being lobbied to include sensory issues as well bt who knows?
So:
ASD = fulcilling DSM or ICD criteria,basically if your child firts the triad on the NAS pages then thats a rough idea.
ASD + no language delay = AS; the idea that it ahs to be mild as a result isn't necessariloy so, the triats in other areas can still be amrked and accompanied by comnorbid disorders. My AS child is less severe but ahrder to cope with than my ASD one.
HFA- ASD + 'normal' IQ + language delays
Classic ' Autism- ASD + low IQ + language delays (if there is language, of course)
It is worth being aware that how the other things present can affect the overall severity. DS3 for example has a DX of ASD but would be obviously HFA except that he spent so much time in autistic absences and has sever langauge delays. These can mask the potential of the child, or even hinder it- if you're in an absence in a lousd place,it doesn't matter if your child has an IQ of 45 or 145, learning will be severely impaired without proper support.
DS1 OTOH has very good lanagugae indeed (16 -21 level at 6)- and chooses to speak in a high pitched squeal called guinea pig speak (many have tried to emulate and all have failed....) much of the time. WHilst that is a choice compared to classic asd kids who don't get one, it's not a choice madewith n NT brain IYSWIM. So even though tyhe language is there, he's not always accessing it or benefitting (though obv we are glad its there, no question).
ASD is often given as a dx now becuase I am told that the worst symptoms areoften seem at 2 -5... the age of assessment and dx, soPaeds and Psychs acknowledge children can move around the spectrum. ASD as a dx allows for interventions to be tailored to a child,not a dx they were given 23 years ago.