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 for severe trouble breathing, blue or grey lips, fainting, new severe chest pain, uncontrolled bleeding, or signs of a stroke such as sudden facial drooping, arm weakness, or speech difficulty.
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
After discharge, contact your healthcare team promptly for fever, increasing wound or line-site redness, worsening swelling, new confusion, difficulty eating or drinking, uncontrolled pain, or a clear decline in breathing or strength.
3
Does any of this apply?
Book an appointment
These concerns are different from routine follow-up appointments.
The article also says
While you are receiving life support, ICU staff monitor you continuously.
Every sign above is quoted from the sofidex article on Life support. If you are not sure, err upward — it is always reasonable to be checked.