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Aldosterone blood test

Definition

The aldosterone blood test measures the level of the hormone aldosterone in blood.

Aldosterone can also be measured using a .

How the Test is Performed

A .

How to Prepare for the Test

Your health care provider may ask you to stop taking certain medicines a few days before the test so that they don't affect the test results. Be sure to tell your provider about all the medicines you take. These include:

  • High blood pressure medicines
  • Heart medicines
  • Nonsteroidal anti-inflammatory drugs (NSAIDs)
  • Antacid and ulcer medicines
  • Water pills (diuretics)

    • Do not stop taking any medicine before talking to your provider. Your provider may recommend that you eat no more than 3 grams of salt (sodium) per day for at least 2 weeks before the test.

    Or, your provider may recommend that you eat your usual amount of salt and also test the amount of .

    At other times, the aldosterone blood test is done right before and after you receive a salt solution (saline) through the vein (IV) for 2 hours. Be aware that other factors can affect aldosterone measurements, including:

  • Pregnancy
  • High- or low-sodium diet
  • High- or low-potassium diet
  • Eating large amounts of black licorice
  • Strenuous exercise
  • Stress

    • How the Test will Feel

    When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging sensation. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

    Why the Test is Performed

    This test is ordered for the following conditions:

  • Certain fluid and disorders, most often low or high blood sodium or low potassium
  • Hard to control blood pressure
  • upon standing (orthostatic hypotension)
  • Discovery of an adrenal nodule on an or done for a different reason (incidentaloma)

    • Aldosterone is a hormone released by the . It helps the body regulate blood pressure. Aldosterone increases the reabsorption of sodium and water and the release of potassium in the kidneys. This action raises blood pressure.

    Aldosterone blood test is often combined with other tests, such as the , to diagnose over- or under-production of aldosterone. The serum potassium and sodium are also often tested along with kidney function.

    Normal Results

    Normal levels vary:

  • Between children, teens, and adults
  • Depending on whether you were standing, sitting, or lying down when the blood was drawn

    • Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.

    What Abnormal Results Mean

    A higher than normal level of aldosterone may be due to:

  • (group of rare conditions that affect the kidneys)
  • Adrenal glands release too much aldosterone hormone ( - usually due to a benign nodule in the adrenal gland)
  • Very low-sodium diet
  • Taking blood pressure medicines called mineralocorticoid antagonists
  • Abuse of diuretics
  • Laxative abuse

    • A lower than normal level of aldosterone may be due to:

  • Adrenal gland disorders, including not releasing enough aldosterone, and a condition called primary adrenal insufficiency ()
  • Very high-sodium diet

    • Risks

    There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

    Other risks associated with having blood drawn are slight but may include:

  • Excessive bleeding
  • Fainting or feeling lightheaded
  • Multiple punctures to locate veins
  • (hematoma)
  • Infection (a slight risk any time the skin is broken)

    • References

    Guber HA, Oprea M, Russell YX . Evaluation of endocrine function. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 25.

    Young MJ, Fuller PJ. Mineralocorticoids: physiology, metabolism, receptors, and resistance. In: Robertson RP, ed. DeGroot's Endocrinology. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 88.

    Schedule An Appointment

    Contact Atlanta Obsetrics and Gynaecology at The Womens Center Millennium Hospital - 404-ATL-BABY

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    Review Date: 7/30/2023

    Reviewed By: Sandeep K. Dhaliwal, MD, board-certified in Diabetes, Endocrinology, and Metabolism, Springfield, VA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.