Serum or plasma concentration of aldosterone (mass concentration)

Why Is This Test Done?

Your doctor may order an aldosterone test to check for conditions like primary aldosteroneism (also called Conn’s syndrome), adrenal gland tumors, or to evaluate symptoms such as high blood pressure, low potassium levels, or unusual thirst and urination.

What to Expect Before the Test

No special preparation is needed, but you may be asked to avoid certain medications (like some blood pressure drugs) or foods (like salt) for a short time before testing, depending on your doctor’s instructions. You’ll provide a blood sample, usually drawn from a vein in your arm.

What the Test Results Mean

Results are compared to a reference range, but exact values can vary by lab. High aldosterone levels may indicate overactive adrenal glands or certain kidney conditions, while low levels might suggest adrenal insufficiency or other hormonal imbalances.

Common Conditions Monitored

This test is often used to diagnose or monitor conditions like hypertension (high blood pressure), hyperaldosteronism, or to assess kidney function in people with fluid or electrolyte imbalances.