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Serum or plasma concentration of aldosterone (substance concentration)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of aldosterone, a hormone produced by your adrenal glands that helps regulate blood pressure and fluid balance in your body.

Quick summary

["Aldosterone helps control how much sodium and potassium your body retains, which can affect your blood pressure and overall fluid levels."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
25773-3
Short code
GH sp12 p chal SerPl-sCnc
Synonyms
GH sp12 p chal SerPl-sCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may order this test if they suspect conditions like primary or secondary hyperaldosteronism, adrenal insufficiency, or certain types of kidney disease. It could also be used to diagnose or monitor conditions affecting your blood pressure or electrolyte balance, such as hypertension or edema.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it involves a blood draw. If you’re taking certain medications (like potassium-sparing diuretics), your doctor may advise adjusting your dose temporarily.

What the Test Involves

A healthcare professional will draw blood from a vein in your arm. The blood sample will be sent to a lab for analysis. The test measures aldosterone levels in your serum or plasma.

What the Results Mean

Results are typically reported as a concentration value (e.g., nanograms per deciliter, ng/dL). Your doctor will compare these results to your clinical picture and reference ranges specific to your age, sex, and health status to determine if further action is needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Aldosterone Level

Frequently asked questions

What causes aldosterone levels to be tested?
Aldosterone levels are tested when doctors suspect hormonal imbalances related to blood pressure, fluid retention, or electrolyte problems. This could happen if you have symptoms like unexplained high blood pressure, frequent urination, muscle weakness, or swelling.
How long does it take to get the results of this test?
Test results are usually available within 1–3 business days, depending on your lab’s processing time. Your doctor will contact you once they have the results to discuss them further.
Can I take my usual medications before this test?
Some medications, like potassium-sparing diuretics, may affect aldosterone levels. If you’re on these or other medications, your doctor will give specific instructions, possibly including temporary adjustments before the test.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy