Cortisol Level: Normal Values, Causes & Treatment
The cortisol level measures the concentration of the stress hormone cortisol in the blood. It plays a key role in metabolism, immune function, and mental well-being.
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The cortisol level measures the concentration of the stress hormone cortisol in the blood. It plays a key role in metabolism, immune function, and mental well-being.
What Is the Cortisol Level?
The cortisol level refers to the concentration of the hormone cortisol in the blood, saliva, or urine. Cortisol is a vital steroid hormone produced by the adrenal cortex. It is often called the stress hormone because it is released in greater amounts during physical and psychological stress. At the same time, it regulates a wide range of essential bodily functions.
Biological Functions of Cortisol
Cortisol plays many important roles in the body:
- Regulation of blood sugar levels by promoting gluconeogenesis
- Modulation of the immune system and suppression of inflammatory responses
- Support of the cardiovascular system through blood pressure regulation
- Influence on the sleep-wake cycle (circadian rhythm)
- Involvement in fat, protein, and carbohydrate metabolism
Normal Values of Cortisol Levels
Cortisol levels follow a natural daily rhythm: they are highest in the morning and decline throughout the day. Typical reference values in blood serum are:
- Morning (8:00 a.m.): approx. 140 to 690 nmol/l (5 to 25 mcg/dl)
- Evening (8:00 p.m.): approx. 80 to 330 nmol/l (3 to 12 mcg/dl)
Exact normal ranges may vary slightly depending on the laboratory and measurement method used.
Causes of Elevated Cortisol Levels
Persistently elevated cortisol levels, also known as hypercortisolism, can have several causes:
- Chronic psychological or physical stress
- Cushing syndrome: a disorder of the adrenal glands or pituitary gland
- Use of corticosteroid medications (drugs with cortisol-like effects)
- Sleep deprivation and an unhealthy lifestyle
- Certain tumors (ACTH-producing tumors)
Causes of Low Cortisol Levels
Abnormally low cortisol levels, also called hypocortisolism, can occur in:
- Addison disease: a condition involving underactivity of the adrenal cortex
- Long-term use of corticosteroids followed by abrupt discontinuation
- Disorders of the pituitary gland or hypothalamus
- Chronic fatigue and certain autoimmune conditions
Symptoms of Abnormal Cortisol Levels
Symptoms of High Cortisol Levels
- Weight gain, especially around the abdomen (central obesity)
- High blood pressure and elevated blood sugar
- Sleep disturbances and inner restlessness
- Muscle weakness
- Mood swings, anxiety, or depression
- Weakened immune system (frequent infections)
Symptoms of Low Cortisol Levels
- Chronic fatigue and exhaustion
- Low blood pressure and dizziness
- Loss of appetite and weight loss
- Nausea and digestive problems
- Darkening of the skin (in Addison disease)
Diagnosis of Cortisol Levels
Cortisol levels can be measured through several methods:
- Blood test: Measurement of serum cortisol, ideally taken in the morning between 7 and 9 a.m.
- Saliva test: A convenient home-based method, particularly for measuring evening cortisol
- 24-hour urine test: Captures total cortisol excretion over an entire day
- Dexamethasone suppression test: A specialized test used to evaluate Cushing syndrome
Treatment and Normalization of Cortisol Levels
Treatment depends on the underlying cause:
- Stress management: Relaxation techniques such as meditation, yoga, or progressive muscle relaxation can help lower cortisol levels
- Sleep hygiene: Sufficient and regular sleep stabilizes the cortisol rhythm
- Diet: A balanced diet rich in omega-3 fatty acids, magnesium, and vitamin C can support cortisol regulation
- Physical activity: Regular, moderate exercise helps regulate cortisol levels
- Medical therapy: Conditions such as Cushing syndrome or Addison disease require targeted medical treatment
References
- Speiser, P.W. et al. - Endocrine Society Clinical Practice Guideline: Diagnosis and Treatment of Primary Adrenal Insufficiency. Journal of Clinical Endocrinology and Metabolism, 2016.
- Nieman, L.K. et al. - The Diagnosis of Cushing's Syndrome: An Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology and Metabolism, 2008.
- World Health Organization (WHO) - Mental Health and Stress-Related Disorders: Biological Markers and Cortisol Regulation. WHO Technical Report, 2022.
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