Testing Room

Dr Suganthi Kumaran discusses in detail the serum potassium test.

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A serum potassium test is used to measure the amount of potassium in blood. Potassium is an electrolyte and is concentrated within the cells of the body. Only two per cent of the body's total potassium is available in the serum or blood stream. Electrolytes conduct electricity and are important for our cells and organs to function normally. Potassium helps move waste out of the cells and nutrients into the cells.

Since the blood concentration of potassium is extremely small, minor changes can have significant consequences. If potassium levels are too low or too high, there can be serious health consequences; a person may be at risk of developing shock, respiratory failure, or heart rhythm disturbances. An abnormal potassium level can alter the function of the nerves and muscles, for example, the heart muscles may loose its ability to contract.

Why it is done?

This test helps reveal whether the potassium levels in the body are normal. It can be done as a part of a routine checkup or in special conditions such as:

checking or monitoring electrolyte imbalance

monitoring certain medications that affect potassium levels, particularly diuretics, heart medications and high blood pressure medications