Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services if someone with diabetes is unconscious, having a seizure, cannot swallow safely, or has severe confusion.
Use emergency glucagon if it is available and you have been shown how.
Do not give food or drink to someone who cannot swallow safely.
Seek emergency care for possible DKA, particularly when high glucose or ketones occur with:
Contact your diabetes service promptly if ketones remain raised, glucose stays high despite following your correction plan, or illness is making insulin and fluid management difficult.
Do not stop background insulin during illness unless a diabetes professional specifically directs you to do so.
Arrange routine follow-up if glucose is often outside your agreed range, low-glucose episodes are becoming more frequent, or injection and device sites are sore or damaged.
Help is also appropriate if diabetes is causing distress, fear of hypoglycemia, disordered eating, or difficulty completing everyday care.
Every sign above is quoted from the sofidex article on Type 1 diabetes. If you are not sure, err upward — it is always reasonable to be checked.