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Also known as: K
Formal name: Potassium

At a Glance

Why Get Tested?


When to Get Tested?

As part of a routine medical examination or to investigate a serious illness, such as high blood pressure or kidney disease

Sample Required?

A blood sample drawn from a vein in the arm

Test Preparation Needed?


The Test Sample

What is being tested?

Potassium is present in all body fluids, but most potassium is within your cells, with only a very small amount in the serum or plasma component of the blood. Because the blood concentration of potassium is so small, minor changes have significant consequences. If potassium goes too low or too high, your health may be impaired: you could be at risk of developing shock, respiratory failure, or heart rhythm disturbances. An abnormal concentration can alter the function of the nerves and muscles; for example, the heart muscle may lose its ability to contract.

How is the sample collected for testing?



No test preparation is needed.

The Test

Common Questions

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