Why get tested?
To detect a problem with the body's electrolyte balance.

When to get tested?
As part of routine blood testing, or when your doctor suspects that you have an imbalance of one of the electrolytes (usually sodium or potassium), or if your doctor suspects an acid-base imbalance. Electrolytes may also be checked if you are prescribed certain drugs, particularly diuretics or ACE inhibitors.

Sample required?
A blood sample drawn from a vein in the arm.

Repeat testing over time may be required to monitor progress.