Quick Facts
- Sample: Blood ( Blood drawn at 8 a.m. and 4 p.m. )
- Fasting: No fasting required. Stop biotin consumption at least 72 hours prior to collection.
- Turnaround: 1-2 days. May take longer based on weather, holiday, or lab delays.
What This Test Measures
This test measures cortisol, the major adrenal glucocorticoid steroid hormone, in a random serum sample. Cortisol is normally regulated through feedback control involving pituitary ACTH and the hypothalamus, and levels can shift throughout the day due to your body's circadian rhythm.
Because this is a random blood draw rather than a timed or 24-hour collection, the result reflects your cortisol level at the specific moment of collection. It does not capture your full daily cortisol pattern. Reported results include total cortisol measured by LC/MS methodology.
Benefits
- Measures serum cortisol at a single point in time
- Uses LC/MS methodology for total cortisol reporting
- Requires no fasting before your blood draw
- Simple blood sample collected at a local lab
- Provides a starting point for further evaluation with your provider
Who Is This Test For?
- Adults whose healthcare provider wants to check current cortisol levels
- People being evaluated for possible cortisol imbalance
- Individuals monitoring cortisol as part of a broader workup
- Those wanting a convenient blood draw without fasting requirements
- People whose provider is considering further adrenal or pituitary evaluation
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. Do I need to fast before this test?
No fasting is required for this test. You should stop consuming biotin at least 72 hours prior to your collection, as biotin can interfere with certain lab test results.
2. How quickly will I get results?
Results are typically available in 1 to 2 days. This timeframe may take longer depending on weather, holidays, or other lab delays.
3. Can timing or collection conditions affect this test?
Yes. Because this is a random serum sample rather than a timed or AM/PM collection, the result reflects cortisol at the moment your blood was drawn. Cortisol levels naturally vary throughout the day due to circadian rhythm, so a single random value may look different than one taken at another time.
4. Can this test identify the cause of fatigue by itself?
No. Fatigue can result from many different factors, and this test measures only one specific marker, total cortisol from a random blood sample. A single cortisol result cannot, by itself, determine what is causing fatigue, and a normal result does not rule out other underlying causes.
5. How do I interpret the results?
Interpreting cortisol results depends on the specimen type, the timing of collection, the laboratory methodology used, and your individual clinical picture, including symptoms, medical history, and medications. A high or low result does not by itself confirm a specific adrenal or pituitary condition. Discuss your results with a qualified healthcare provider for proper interpretation.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
6. What should I do if my results are abnormal?
If your cortisol result falls outside the expected range, review the results with a qualified healthcare provider, who can help determine whether additional evaluation is appropriate based on your full clinical picture.
Pre test preparation
No fasting is required for this test. Stop biotin consumption at least 72 hours prior to the collection.
