Son not diagnosed with type 1 despite symptoms

My 3 year old was admitted into the hospital earlier this week due to increased drinking, eating and peeing along with personality changes and blood sugar of 241.

They immediately ruled out type 1 because his A1C was 5.2. They then ruled out diabetes insipidus, addisons disease and insulimnomas. They also had me and my son sit with a psychologist to make sure we don't have mental problems.

Over the 4 days we were there, they only did one post meal (chicken breast, green beans, 4oz Apple juice and 3 bites of an apple) blood sugar and it was 238 3 hours after eating. It came down to 100 4.5 hours after eating so they said that that confirmed it wasn't diabetes.

He had one fasting glucose of 108. Three other fasting glucose were mid 80s. He also had a blood glucose drop to 42 without medication.

We were discharged with instructions to monitor his food and water intake and take blood sugar at home. We're to follow up with endocrinology in a month.

Has anyone had this only to later be diagnosed with type 1? I'm wondering if we need a second opinion and where to go as we were at our state's most renown children's hospital.

Thanks, Lanie. Our 4 year old has celiac so our whole family only eats meats, veggies and fruits. We don't eat anything processed at all. Should we limit fruits?

He has an appointment with a pediatric endocrinologist, but it's the same hospital system. So I'm wondering if I should get a second, second opinion.

Yes. They said that because his body can bring the sugar down from 238 to 100 on its own, then it's not diabetes. They also said that because the sugar isn't spilling into his urine, then it's not diabetes. And because he had a hypoglycemic incident without giving him medication, then he Can't have diabetes. I'm not a doctor, but I'm just wondering if maybe we're at the beginning stages of the disease.