It depends on what the true blood sugar value was: if someone were already at the high end of normal and a 'brittle diabetic', you can end up in 'diabetic ketoacidosis' for T1DM individuals or—less likely—'hyperosmolar hyperglycemic state' generally.
See https://www.mayoclinic.org/diseases-conditions/hyperglycemia... for a discussion of both (in Emergency conditions)