What blood test shows cortisol levels?

Cortisol levels are measured through blood tests (serum cortisol), saliva tests, or 24-hour urine tests, with morning blood draws being the most common method. Each test type offers different insights into your stress hormone patterns and adrenal function.

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Understanding Cortisol and Why Testing Matters

Cortisol, often called the "stress hormone," plays a crucial role in your body's response to stress, metabolism, immune function, and blood pressure regulation. Produced by your adrenal glands, cortisol levels naturally fluctuate throughout the day, typically peaking in the early morning and declining throughout the afternoon and evening. When these patterns become disrupted or cortisol levels remain chronically elevated or suppressed, it can lead to various health issues ranging from fatigue and weight gain to more serious conditions like Cushing's syndrome or Addison's disease.

Testing cortisol levels helps healthcare providers diagnose adrenal disorders, evaluate stress-related health issues, and monitor treatment effectiveness. Whether you're experiencing unexplained fatigue, weight changes, mood swings, or other symptoms that might be related to cortisol imbalance, understanding which tests are available and what they measure can help you take control of your health. Regular monitoring of cortisol levels can provide valuable insights into your stress response and overall metabolic health.

Types of Cortisol Tests Available

There are three main types of tests used to measure cortisol levels, each offering unique advantages and insights into your adrenal function. Understanding the differences between these tests can help you and your healthcare provider choose the most appropriate option for your specific situation.

Normal Cortisol Ranges by Test Type and Time of Day

Reference ranges may vary by laboratory. Always consult with your healthcare provider for interpretation.
Test TypeTime of DayNormal RangeClinical Significance
Blood (Serum)Blood (Serum)Morning (7-9 AM)10-20 mcg/dLPeak levels; below 5 may indicate adrenal insufficiency
Blood (Serum)Blood (Serum)Afternoon (4 PM)3-10 mcg/dLMid-day decline; elevated levels may suggest Cushing's
Blood (Serum)Blood (Serum)Evening<5 mcg/dLLowest levels; elevation indicates disrupted rhythm
SalivaSalivaMorning0.094-1.551 mcg/dLCorrelates with blood levels; convenient for home testing
SalivaSalivaBedtime0.010-0.090 mcg/dLShould be significantly lower than morning
24-Hour Urine24-Hour UrineFull day collection10-100 mcg/24 hoursTotal daily cortisol production; useful for Cushing's diagnosis

Reference ranges may vary by laboratory. Always consult with your healthcare provider for interpretation.

Blood (Serum) Cortisol Test

The blood cortisol test, also known as serum cortisol test, is the most common method for measuring cortisol levels. This test requires a blood sample drawn from a vein, typically in your arm. Healthcare providers often order this test to be performed at specific times of day, most commonly in the morning (between 7-9 AM) when cortisol levels should be at their peak, or in the evening (around 4 PM) when levels are naturally lower.

The serum cortisol test is particularly useful for diagnosing conditions like Cushing's syndrome (characterized by excess cortisol) or Addison's disease (characterized by insufficient cortisol). It provides a snapshot of your cortisol level at a specific moment, making timing crucial for accurate interpretation. Some healthcare providers may order multiple blood draws throughout the day to assess your cortisol rhythm.

Saliva Cortisol Test

Saliva cortisol testing has gained popularity due to its convenience and non-invasive nature. This test measures the amount of cortisol in your saliva, which closely correlates with blood cortisol levels. The major advantage of saliva testing is that it can be done at home, allowing for multiple samples throughout the day without the stress of repeated blood draws.

Saliva tests are particularly valuable for assessing your cortisol rhythm throughout the day. Typically, you'll collect samples at specific times: upon waking, before lunch, before dinner, and before bed. This comprehensive approach provides a clearer picture of how your cortisol levels fluctuate naturally and can help identify disruptions in your circadian rhythm. For those interested in understanding their daily cortisol patterns and how stress affects their hormone levels, at-home saliva testing offers an accessible solution.

24-Hour Urine Cortisol Test

The 24-hour urine cortisol test measures the total amount of cortisol excreted in your urine over a full day. This test requires collecting all urine produced during a 24-hour period in a special container. While more cumbersome than blood or saliva tests, it provides valuable information about your overall cortisol production rather than levels at specific time points.

This test is particularly useful for diagnosing Cushing's syndrome, as it can detect consistently elevated cortisol production that might be missed by single-point blood tests. The 24-hour collection helps account for the natural variations in cortisol throughout the day and provides an average of your cortisol output.

Normal Cortisol Ranges and What They Mean

Understanding normal cortisol ranges is essential for interpreting your test results, though it's important to note that reference ranges can vary between laboratories and testing methods. Cortisol levels also vary significantly based on the time of day, your age, and individual factors.

For blood cortisol tests, normal morning levels (7-9 AM) typically range from 10-20 micrograms per deciliter (mcg/dL), while afternoon levels (around 4 PM) usually fall between 3-10 mcg/dL. Evening cortisol should be significantly lower, often less than 5 mcg/dL. These variations reflect your body's natural circadian rhythm, with cortisol helping you wake up and stay alert during the day.

Saliva cortisol tests have their own reference ranges, with morning levels typically between 0.094-1.551 mcg/dL and bedtime levels dropping to 0.010-0.090 mcg/dL. The 24-hour urine test usually shows total cortisol excretion between 10-100 mcg per 24 hours, though this can vary based on body size and other factors.

When to Get Your Cortisol Levels Tested

Recognizing when to test your cortisol levels can help identify potential health issues early. Your healthcare provider might recommend cortisol testing if you're experiencing symptoms that could indicate either high or low cortisol levels.

Symptoms of High Cortisol

  • Unexplained weight gain, particularly around the midsection and upper back
  • Purple stretch marks on the abdomen
  • Easy bruising and slow wound healing
  • Muscle weakness, especially in the upper arms and thighs
  • High blood pressure that's difficult to control
  • Mood changes including depression, anxiety, or irritability
  • Irregular menstrual periods in women
  • Decreased fertility in men

Symptoms of Low Cortisol

  • Chronic fatigue that doesn't improve with rest
  • Muscle weakness and joint pain
  • Unintentional weight loss
  • Low blood pressure and dizziness upon standing
  • Salt cravings
  • Darkening of skin in certain areas
  • Nausea, vomiting, or abdominal pain
  • Depression or mood changes

If you're experiencing any combination of these symptoms, discussing cortisol testing with your healthcare provider can help determine if hormonal imbalances are contributing to your health concerns. Early detection and proper management of cortisol disorders can significantly improve quality of life and prevent more serious complications.

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Factors That Can Affect Cortisol Test Results

Several factors can influence your cortisol test results, making it important to prepare properly and inform your healthcare provider about any relevant circumstances. Understanding these factors helps ensure accurate results and proper interpretation of your cortisol levels.

Medications can significantly impact cortisol levels. Corticosteroids like prednisone can suppress natural cortisol production, while certain antidepressants, birth control pills, and even some herbal supplements can affect results. Always provide your healthcare provider with a complete list of medications and supplements you're taking.

Lifestyle factors also play a crucial role. Physical or emotional stress, intense exercise, shift work, jet lag, illness, and even the stress of having blood drawn can temporarily elevate cortisol levels. Poor sleep, alcohol consumption, and caffeine intake can also affect results. For the most accurate results, try to maintain your normal routine and avoid strenuous exercise for 24 hours before testing.

Interpreting Your Cortisol Test Results

Interpreting cortisol test results requires considering multiple factors beyond just the numbers. Your healthcare provider will evaluate your results in the context of your symptoms, medical history, the timing of the test, and any medications you're taking. A single abnormal result doesn't necessarily indicate a problem, as cortisol levels can fluctuate due to various temporary factors.

If your initial cortisol test shows abnormal results, your healthcare provider may recommend additional testing to confirm the findings. This might include repeating the test at different times, using a different testing method, or performing specialized tests like the dexamethasone suppression test or ACTH stimulation test. These follow-up tests help differentiate between various causes of abnormal cortisol levels and guide appropriate treatment.

For those interested in ongoing monitoring of their stress hormones and metabolic health, regular testing can help track how lifestyle changes, stress management techniques, and treatments affect cortisol levels over time. Understanding your cortisol patterns empowers you to make informed decisions about your health and work with your healthcare provider to optimize your hormonal balance.

Advanced Testing Options and Comprehensive Health Assessment

While standard cortisol tests provide valuable information, comprehensive health assessments that include cortisol alongside other biomarkers can offer deeper insights into your overall health. Cortisol doesn't work in isolation; it interacts with other hormones and metabolic markers to influence your energy, mood, weight, and overall well-being.

Modern at-home testing options have made it easier than ever to monitor your cortisol levels and other important biomarkers regularly. These tests can help you understand how your lifestyle choices, stress management strategies, and overall health habits affect your hormonal balance. By tracking changes over time, you can see the direct impact of interventions like improved sleep, stress reduction techniques, dietary changes, and exercise on your cortisol levels.

For a comprehensive understanding of your health, consider testing cortisol alongside other key biomarkers like thyroid hormones, sex hormones, metabolic markers, and inflammatory indicators. This holistic approach helps identify patterns and connections between different body systems, enabling more targeted and effective health optimization strategies. If you have existing blood test results that include cortisol or other biomarkers, you can get a free, comprehensive analysis at SiPhox Health's upload service to better understand what your results mean and receive personalized recommendations.

Taking Action on Your Cortisol Results

Once you have your cortisol test results, the next step is working with your healthcare provider to develop an appropriate action plan. If your cortisol levels are abnormal, treatment will depend on the underlying cause. For high cortisol levels not caused by medication, treatment might include addressing the source of excess cortisol production, whether it's a tumor, chronic stress, or other factors.

For many people, lifestyle modifications can significantly impact cortisol levels. Stress management techniques like meditation, yoga, deep breathing exercises, and regular physical activity can help regulate cortisol production. Improving sleep quality, maintaining a balanced diet, limiting caffeine and alcohol, and establishing regular daily routines all contribute to healthier cortisol patterns.

Remember that optimizing cortisol levels is often a gradual process that requires patience and consistency. Regular monitoring can help you and your healthcare provider track progress and adjust your treatment plan as needed. Whether through medical intervention, lifestyle changes, or a combination of both, achieving balanced cortisol levels can lead to improved energy, better stress resilience, enhanced mood, and overall better health outcomes.

References

  1. Nieman LK, Biller BM, Findling JW, et al. The diagnosis of Cushing's syndrome: an Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2008;93(5):1526-1540.[Link][PubMed][DOI]
  2. Bornstein SR, Allolio B, Arlt W, et al. Diagnosis and Treatment of Primary Adrenal Insufficiency: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2016;101(2):364-389.[Link][PubMed][DOI]
  3. El-Farhan N, Rees DA, Evans C. Measuring cortisol in serum, urine and saliva - are our assays good enough? Ann Clin Biochem. 2017;54(3):308-322.[Link][PubMed][DOI]
  4. Raff H, Raff JL, Findling JW. Late-night salivary cortisol as a screening test for Cushing's syndrome. J Clin Endocrinol Metab. 1998;83(8):2681-2686.[Link][PubMed][DOI]
  5. Laudat MH, Cerdas S, Fournier C, Guiban D, Guilhaume B, Luton JP. Salivary cortisol measurement: a practical approach to assess pituitary-adrenal function. J Clin Endocrinol Metab. 1988;66(2):343-348.[PubMed][DOI]
  6. Turpeinen U, Hämäläinen E. Determination of cortisol in serum, saliva and urine. Best Pract Res Clin Endocrinol Metab. 2013;27(6):795-801.[Link][PubMed][DOI]

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Frequently Asked Questions

How can I test my cortisol at home?

You can test your cortisol at home with SiPhox Health's Stress, Energy & Sleep Rhythm Cortisol test, which measures your cortisol levels at three points throughout the day using simple saliva samples. This test helps identify imbalances in your cortisol rhythm that may be affecting your energy, sleep, and stress response.

What's the difference between blood and saliva cortisol tests?

Blood cortisol tests require a venipuncture and provide a snapshot of cortisol at one moment, while saliva tests are non-invasive and can be done at home multiple times throughout the day. Saliva tests are ideal for assessing your daily cortisol rhythm, while blood tests are often preferred for diagnosing specific medical conditions.

How often should I test my cortisol levels?

Testing frequency depends on your health goals and symptoms. For initial assessment, a single comprehensive test is appropriate. If you're monitoring treatment effectiveness or lifestyle changes, testing every 3-6 months can help track progress. Those with diagnosed adrenal conditions may need more frequent monitoring as directed by their healthcare provider.

Can stress from the blood draw itself affect cortisol results?

Yes, the stress of having blood drawn can temporarily elevate cortisol levels, potentially affecting results. This is why some healthcare providers prefer saliva or urine tests for cortisol assessment, as they can be done in a more relaxed setting. If you're anxious about blood draws, discuss alternative testing options with your provider.

What time of day is best for cortisol testing?

For single-point testing, morning (7-9 AM) is typically preferred as cortisol should be at its peak. However, comprehensive cortisol rhythm assessment requires multiple samples throughout the day: morning, afternoon, evening, and bedtime. This provides a complete picture of your cortisol pattern and can identify rhythm disruptions.

This article is licensed under CC BY 4.0. You are free to share and adapt this material with attribution.

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Director of Clinical Product Operations at SiPhox Health with a background in medicine and a passion for health optimization. Experienced in leading software and clinical development teams, contributing to patents, launching health-related products, and turning diagnostics into actionable tools.

View Details
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Dr. Thompson’s interests in exercise, general cardiology and sports cardiology originated from his own distance running: he qualified for the 1972 Olympic Marathon Trials as a 3rd year medical student and finished 16th in the 1976 Boston Marathon. Dr. Thompson publishes a blog 500 Rules of Cardiology where he shares lessons and anecdotes that he has learned over his extensive career as a physician, researcher and teacher.

View Details
Robert Lufkin, MD

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Advisor

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His latest book, ‘Lies I Taught In Medical School’ is an instant New York Times bestseller and has re-framed how we think about metabolic health and longevity. In addition to being a practicing physician, he is author of over 200 peer reviewed scientific papers and 14 books that are available in fourteen languages.

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Advisor

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In addition to his academic pursuits, Dr. Bikman is the author of Why We Get Sick and How Not To Get Sick.

View Details
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Health Programs Lead, Heart & Metabolic

Dr. Natasha Milinkovic is part of the clinical product team at SiPhox Health, having graduated from the University of Bristol Medical School. Her medical career includes rotations across medical and surgical specialties, with specialized research in vascular surgery, focusing on recovery and post-operative pain outcomes. Dr. Milinkovic built her expertise in emergency medicine as a clinical fellow at a major trauma center before practicing at a central London teaching hospital throughout the pandemic.

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View Details
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Health Programs Lead, Health Innovation

Dr. Tsogbayar leverages her clinical expertise to develop innovative health solutions and evidence-based coaching. Dr. Tsogbayar previously practiced as a physician with a comprehensive training background, developing specialized expertise in cardiology and emergency medicine after gaining experience in primary care, allergy & immunology, internal medicine, and general surgery.

She earned her medical degree from Imperial College London, where she also completed her MSc in Human Molecular Genetics after obtaining a BSc in Biochemistry from Queen Mary University of London. Her academic research includes significant work in developmental cardiovascular genetics, with her thesis publication contributing to the understanding of genetic modifications on embryonic cardiovascular development.

View Details
Pavel Korecky, MD

Pavel Korecky, MD

Director of Clinical Product Operations

Director of Clinical Product Operations at SiPhox Health with a background in medicine and a passion for health optimization. Experienced in leading software and clinical development teams, contributing to patents, launching health-related products, and turning diagnostics into actionable tools.

View Details
Paul Thompson, MD

Paul Thompson, MD

Advisor

Paul D. Thompson is Chief of Cardiology Emeritus of Hartford Hospital and Professor Emeritus at University of Connecticut Medical School. He has authored over 500 scientific articles on cardiovascular risk factors, the effects of exercise, and beyond. He received National Institutes of Health’s (NIH) Preventive Cardiology Academic Award, and has received NIH funding for multiple studies.

Dr. Thompson’s interests in exercise, general cardiology and sports cardiology originated from his own distance running: he qualified for the 1972 Olympic Marathon Trials as a 3rd year medical student and finished 16th in the 1976 Boston Marathon. Dr. Thompson publishes a blog 500 Rules of Cardiology where he shares lessons and anecdotes that he has learned over his extensive career as a physician, researcher and teacher.

View Details
Robert Lufkin, MD

Robert Lufkin, MD

Advisor

Physician/medical school professor (UCLA and USC) and New York Times bestselling author empowering people to take back their metabolic health with lifestyle and other tools. A veteran of the Today Show, USA Today, and a regular contributor to FOX and other network news stations, his weekly video podcast reaches over 500,000 people. After reversing chronic disease and transforming his own life he is making it his mission to help others do the same.

His latest book, ‘Lies I Taught In Medical School’ is an instant New York Times bestseller and has re-framed how we think about metabolic health and longevity. In addition to being a practicing physician, he is author of over 200 peer reviewed scientific papers and 14 books that are available in fourteen languages.

View Details
Ben Bikman, PhD

Ben Bikman, PhD

Advisor

Benjamin Bikman earned his Ph.D. in Bioenergetics and was a postdoctoral fellow with the Duke-National University of Singapore in metabolic disorders. Currently, his professional focus as a scientist and professor (Brigham Young University) is to better understand the role of elevated insulin and nutrient metabolism in regulating obesity, diabetes, and dementia.

In addition to his academic pursuits, Dr. Bikman is the author of Why We Get Sick and How Not To Get Sick.

View Details
Tash Milinkovic, MD

Tash Milinkovic, MD

Health Programs Lead, Heart & Metabolic

Dr. Natasha Milinkovic is part of the clinical product team at SiPhox Health, having graduated from the University of Bristol Medical School. Her medical career includes rotations across medical and surgical specialties, with specialized research in vascular surgery, focusing on recovery and post-operative pain outcomes. Dr. Milinkovic built her expertise in emergency medicine as a clinical fellow at a major trauma center before practicing at a central London teaching hospital throughout the pandemic.

She has contributed to global health initiatives, implementing surgical safety standards and protocols across rural Uganda. Dr. Milinkovic initially joined SiPhox Health to spearhead the health coaching initiative and has been a key contributor in the development and launch of the Heart and Metabolic program. She is passionate about addressing health disparities by building scalable healthcare solutions.

View Details