Aldosterone test
Explanation
An aldosterone test measures a hormone made by the adrenal glands, which sit above the kidneys. Aldosterone helps the kidneys keep salt and water and remove potassium, affecting blood pressure.
Why is renin tested too?
Renin is a protein released by the kidneys. It starts a chain of reactions that helps control aldosterone production and blood pressure. When aldosterone stays too high despite low renin, this can suggest primary aldosteronism. In this condition, one or both adrenal glands make more aldosterone than the body needs.
The report may include an aldosterone-to-renin ratio, or ARR. This screening result needs the individual hormone values and the laboratory’s method and units. It is not a diagnosis by itself.
What can change the result?
Potassium levels, medicines, salt intake and whether you were sitting or standing can affect interpretation. Low potassium can make aldosterone look lower than it otherwise would.
Follow the preparation instructions from the testing team. Do not stop blood-pressure medicines or change your salt intake on your own.
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