Potassium

A salt essential for heart rhythm and muscles.

If it's high

Can affect heart rhythm; can relate to kidney function or medicines, or a delayed sample.

If it's low

Can cause weakness or cramps; often linked to vomiting, diarrhoea or water tablets.

• Bananas, coconut water, oranges, potatoes, spinach and beans

A question for your doctor

Should this be rechecked promptly?

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