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Cortisol, Free, Saliva

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

This test measures the amount of cortisol, a natural steroid hormone, present in your saliva. It helps assess your body’s cortisol levels without blood draws, often used to evaluate stress responses or adrenal function.

Quick summary

["Saliva cortisol testing can help diagnose conditions linked to stress or hormone imbalances."]

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

Key facts at a glance

LOINC
58669-3
Short code
Cortis 4 PM Sal-sCnc
Synonyms
Cortis 4 PM Sal-sCnc
Category
hormone
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 Matters

Saliva cortisol is a convenient way to measure cortisol levels throughout the day, as it reflects free (unbound) cortisol that can cross cell membranes. Unlike blood tests, saliva collection is non-invasive and can provide insights into circadian rhythms and stress-related hormone fluctuations.

How It Works

A small saliva sample is collected (often over 24 hours or specific times of day) and analyzed to detect cortisol levels. The test measures cortisol in its free form, which is biologically active.

What It Can Tell You

Elevated or low cortisol levels in saliva may indicate conditions like Cushing’s syndrome, adrenal insufficiency, or chronic stress. Results can help determine whether your symptoms align with hormonal imbalances.

Common Uses

Saliva cortisol testing is commonly used to diagnose or monitor conditions tied to cortisol dysregulation, such as adrenal disorders, sleep disorders (e.g., sleep apnea), or stress-related illnesses.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Free Saliva Cortisol

Frequently asked questions

What does a high or low saliva cortisol result mean?
High levels may suggest conditions like Cushing’s syndrome or excessive stress, while low levels could indicate adrenal insufficiency or other hormonal imbalances. Your doctor will interpret results in the context of your symptoms and medical history.
How often is this test repeated?
Your doctor may recommend repeating the test if initial results are unclear or if symptoms persist. Some tests are done at specific times (e.g., morning/evening) to track daily fluctuations.
Does this test require fasting?
No fasting is needed for saliva cortisol testing, as it measures cortisol in your saliva naturally. However, follow your lab’s instructions for sample collection timing (e.g., morning vs. evening samples).
  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