Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency help now if you have severe or rapidly worsening muscle weakness, difficulty breathing, fainting, collapse, or a new racing, pounding, very slow, or irregular heartbeat.
Do not drive yourself if you feel faint or seriously unwell.
Follow urgent instructions from a laboratory or healthcare service if you are told that your potassium is critically high.
A dangerous level may cause no warning symptoms.
Contact a healthcare professional promptly if you develop new weakness, tingling, nausea, or palpitations, especially if you have kidney disease, diabetes, heart failure, or take medicines that can raise potassium.
Routine follow-up is appropriate for a mild, stable result when you have been given a clear plan for repeat testing and feel well.
Make sure the repeat test happens when arranged.
Do not stop prescribed heart, blood pressure, or kidney medicines on your own.
Every sign above is quoted from the sofidex article on High potassium. If you are not sure, err upward — it is always reasonable to be checked.