Serum or plasma concentration of aldosterone

Why This Test Might Be Ordered

Your doctor may order aldosterone testing if they suspect conditions like primary aldosteroneism (also called Conn’s syndrome), adrenal gland tumors, or other hormonal imbalances affecting blood pressure or kidney function. It may also be used to evaluate symptoms such as high blood pressure, low potassium levels, or signs of excess aldosterone.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to avoid certain medications or foods for a short time before testing. If you’re taking potassium-sparing diuretics or other medications that affect aldosterone, your doctor may advise adjustments.

How the Test Is Performed

A blood sample is drawn from a vein in your arm. The sample is sent to a lab where it is analyzed to measure aldosterone concentration using a sensitive immunoassay method.

What the Results Mean

High aldosterone levels may indicate conditions like primary aldosteroneism, which can lead to high blood pressure or low potassium. Low levels might suggest adrenal insufficiency or other hormonal disorders. Your doctor will interpret results in the context of your symptoms and other test findings.