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
Seek emergency medical care for:
Fainting, collapse, or severe dizziness
Chest pain or a sustained fast or irregular heartbeat
Sudden severe weakness or inability to move normally
Trouble breathing
Severe abdominal swelling with vomiting or inability to pass stool or gas
Do not drive yourself for emergency care if you feel faint, severely weak, or have significant heart symptoms.
And for anyone, someone who:
is bleeding heavily and it will not stop with firm pressure
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 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
Arrange prompt medical advice if you develop new muscle weakness, repeated cramps, constipation, or palpitations, especially if you have recently had vomiting or diarrhoea or take a medicine that can lower potassium.
Contact your healthcare service promptly if a blood test shows low potassium and you have not received a follow-up plan.
3
Does any of this apply?
Book an appointment
Routine follow-up may include another blood test, a medicine review, or tests for the cause.
Every sign above is quoted from the sofidex article on Low blood potassium. If you are not sure, err upward — it is always reasonable to be checked.