4 year old - autistic traits?

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My DS is in nursery full time ( attached to school) A few weeks ago his teacher asked me and my DH in to speak about him as she has concerns about some behaviours. He struggles with change and was very unsettled when a teacher left, she tells us this manifests itself in physical ticks. He also gets anxious and needs reassurance at nursery. I spoke to her this morning and she said she now thinks we should take him to the GP for an assessment - the school won't do it until he's in school but she suggests doing it now via the GP. Does anyone have any experience of this? She says it won't impact his learning, in fact he is very bright and very interested in learning and good at numbers and language. I want to help him in whatever way I can but I find it strange as he doesn't display any of this behaviour at home. In fact, he is happy, confident, affectionate etc at home Does anyone have any experience of this? Or any advice?

It sounds bit odd to me too. Rigidity or an adverse reaction to change can and are autism markers. However, they alone are not enough to mean that a child has autism. Also, these behaviours need to be persistent, not just once in a while when he is having a bad day. Autism is primarily a deficit in social communication which must be present before the other 'quirks' become concerning. By 4YRs old, a child will start to have child friends, or have a favourite child, etc. They should also start to understand the rules of social engagement and start playing with other peers appropriately (understand the games being played, take turns, share, say hello/goodbye, etc)