Welcome to the forum!
My son Ross is 12 and diagnosed with Type 1 about five weeks ago. He went back to school two weeks ago - once the Easter holiday was over. There are lots of opinions about this - some people send their children back as soon as they're out of hospital. We didn't do this mainly because there was only half a week left until the Easter holidays. I think even if the holidays had been close I would probably have kept him off a little longer anyway because both he and I (and his twin brother and my OH) all needed time to get our heads around diabetes. More for me, I needed to accept that he isn't made of glass - although I haven't yet come to terms with that to be honest!
I think the best answer is for him to go back when your DSN recommends and when you feel confident that the school has all the necessary care plans in place.
When Ross returned the SENCO was stuck in the USA because of the volcanic ash (apparently she's still not back....). I went in with him and spoke to another member of the special needs team who works in their medical room. I had all my initial fears put to rest - they already have two other T1 pupils. It was explained to both of us how Ross would go to the medical room whenever he needs to test his blood or to inject. He isn't allowed out of the room unless his blood is within range. If he's high they make him run up and down the stairs outside (!!) and in fact he was just two points above the other day and they 'phoned me to ask what was the best way forward as he was about to have lunch - unfortunately it was the beginning of Ross's blood levels being all over the place - they're still not settled

However, they did the right thing and I always feel in the loop.
We're just trying to sort out how to get all his readings through the school day properly recorded - I think we'll go for a new Bayer Contour USB meter - hopefully the shiny technology will be appealing for him and he'll make sure he plugs it in to the PC at home each day!
So in short I think you need to speak to both your DSN and the school - they'll guide you. Don't forget though that very, very quickly you'll become the expert and it won't all feel as scary as it does right now - and I'm speaking from very recent experience on this one!
Good luck and keep in touch on here
🙂
Heidi
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