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Serum or plasma mass concentration of aldosterone

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 affects your blood pressure and heart function."]

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

Key facts at a glance

LOINC
27359-9
Short code
GH sp15 p chal SerPl-mCnc
Synonyms
GH sp15 p chal SerPl-mCnc
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 Is This Test Done?

Your doctor may order aldosterone testing to diagnose 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 unexplained muscle weakness.

What Does a High or Low Level Mean?

High aldosterone levels may indicate overactivity of your adrenal glands, which can lead to high blood pressure or other health issues. Low levels might suggest adrenal insufficiency or other hormonal imbalances.

How Is This Test Performed?

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

What Are Common Symptoms to Watch For?

Symptoms like frequent urination, excessive thirst, high blood pressure, or muscle cramps may signal hormonal imbalances that this test helps identify.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Aldosterone level

Frequently asked questions

What causes abnormal aldosterone levels?
Abnormal aldosterone levels can result from adrenal gland disorders (such as tumors), certain medications, kidney disease, or genetic conditions affecting hormone production.
How often should this test be repeated?
Your doctor will determine how often to repeat this test based on your symptoms, medical history, and treatment plan. Follow-up may be needed if you have ongoing health concerns related to aldosterone.
Does fasting affect this test?
Fasting may not typically affect aldosterone levels, but your doctor may provide specific instructions based on your individual health status or test protocol.
  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