Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Call emergency services if you become confused, very drowsy or difficult to wake, or if severe illness includes repeated vomiting, deep rapid breathing or an inability to keep fluids down.
These signs may indicate a serious problem, including severe hyperglycaemia, meaning very high blood sugar.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek prompt medical advice if you develop:
Marked thirst or much more frequent urination
Repeated blurred vision
Unexplained weight loss
Persistent unusual tiredness
Recurrent skin, urine or genital infections
These symptoms do not prove that you have diabetes, but they are reasons to check your blood sugar.
And for anyone, someone who:
has a wound that is hot, spreading red, or leaking pus
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if you have been told that a blood test is in the prediabetes range and have not discussed follow-up.
Routine review is also appropriate if you are concerned about your diabetes risk, especially after gestational diabetes or if close relatives have type 2 diabetes.
The article also says
IGT itself is not an emergency.
Every sign above is quoted from the sofidex article on Impaired glucose tolerance. If you are not sure, err upward — it is always reasonable to be checked.