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Serum or plasma concentration of aldosterone (mass 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.

Quick summary

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

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

Key facts at a glance

LOINC
63403-0
Short code
ENA SS-B Ab Fld IA-aCnc
Synonyms
ENA SS-B Ab Fld IA-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 recommend this test if you have symptoms like high blood pressure, low potassium levels, or signs of conditions like primary aldosteroneism (Conn’s syndrome), adrenal tumors, or certain kidney disorders. It may also be used to monitor conditions like heart failure or to check for hormonal imbalances.

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), let your doctor know beforehand.

How the Test Works

A small sample of blood is taken from a vein in your arm. The sample is then analyzed in a lab to measure aldosterone levels using a sensitive detection method, often an immunoassay.

What the Results Mean

Results are compared to a reference range specific to your lab, which accounts for factors like age, sex, and overall health. High levels may suggest overactive adrenal glands, while low levels could indicate adrenal insufficiency or other conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Aldosterone level

Frequently asked questions

What does my aldosterone level tell me about my health?
High aldosterone levels may indicate conditions like primary aldosteroneism, which can cause high blood pressure, low potassium, or heart strain. Low levels might suggest adrenal gland problems or other hormonal imbalances that need further evaluation.
How often should I get this test?
Your doctor will determine how often you need this test based on your symptoms, medical history, and treatment plan. Regular monitoring may be needed if you have chronic conditions like hypertension or kidney disease.
Can I eat or drink before this test?
If fasting is required, avoid food and liquids (except water) for 8–12 hours before the test. If your doctor says otherwise, follow their instructions to ensure accurate results.
  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