Potassium

Clinical Chemistry

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Description

Potassium is the major intracellular cation. It is essential to nerve and muscle function. Potassium is taken in via the diet and mainly excreted in the urine. For guidance on the causes, investigation and management of hyper- and hypo-kalaemia see clinical chemistry guidelines available on CCG portal.

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Indications

Usually performed as part of a "U&E" profile. Serum potassium 1. Diagnosis of hyper- and hypo-kalaemia. 2. Monitoring of patients at risk of hyper- or hypo-kalaemia. Urine potassium 1. Investigation of hyper- or hypo-kalaemia.

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Sample Type

Serum, Gel/SST minimum 2mL (1mL separated serum). Urine (plain container, no preservative).

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Reference Range

Reference ranges are provided on the report. Alternatively, please contact the laboratory for current ranges.

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Turnaround Time

Within 1 day

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Testing Frequency

As required.

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External Notes

Avoid haemolysis and separate promptly. A Lithium heparin sample is preferred in cases of spurious hyperkalaemia due to high white cell or platelet counts.

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Please note: the above information is subject to change and we endeavour to keep this website up to date wherever necessary.