Home Cortisol Test Guide
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A screening questionnaire for symptoms that may be associated with abnormal cortisol levels (excess or deficiency). Mark the symptoms that concern you - the result will tell you whether it is worth performing a laboratory test.
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Other tools you may find usefulCortisol - a stress hormone of key circadian importance
Cortisol is a natural steroid hormone produced by the adrenal cortex, belonging to the group of glucocorticosteroids. It is often called the "stress hormone" because its concentration in blood and saliva increases rapidly in situations of nervous tension and physical exertion. Cortisol plays a key role in regulating the metabolism of glucose, proteins and fats, affects blood pressure and the immune system (has anti-inflammatory effects). This hormone has a clear circadian rhythm - its highest concentration occurs in the morning (right after waking up to give the body energy), and the lowest concentration occurs around midnight, making it easier to fall asleep.
Our guide to home cortisol tests explains how to safely test your cortisol levels using saliva samples collected at home, how to interpret the results, and the symptoms of too high and low cortisol levels.
Symptoms of impaired cortisol levels in the body
Both excess and deficiency of cortisol lead to serious health consequences:
- High cortisol (Hypercortisolemia):May lead to the development of Cushing's syndrome. Symptoms include: accumulation of fat tissue on the neck ("bull's neck") and belly, insomnia, chronic fatigue, hypertension, mood swings and characteristic red stretch marks on the skin.
- Low cortisol (Hypocortisolemia):May indicate adrenal insufficiency (Addison's disease). Symptoms include: muscle weakness, low blood pressure, cravings for salty foods, weight loss, darkening of the skin (discoloration) and depression.
Daily rhythm and norms of cortisol levels in the body
The table below shows the approximate norms of cortisol concentration in the blood depending on the time of day:
| Time of sample collection | Approximate norms of the concentration in the blood (µg/dl) | Physiological state of the body | Diagnostic remarks |
|---|---|---|---|
| Morning (6:00 – 10:00) | 5.0 – 23.0 µg/dl | Peak secretion (waking up the body). | Best time for a standard blood test. |
| Afternoon (4:00 p.m.) | 3.0 – 15.0 µg/dl | Natural decrease in daily activity. | The level should drop by about 50% compared to the morning level. |
| Midnight (23:00 - 24:00) | Below 5.0 µg/dl | Minimal secretion (preparation for sleep). | High levels at this time suggest insomnia and chronic stress. |
How does the home saliva cortisol test work?
Home cortisol tests are available by mail order. Instead of the hassle of taking blood in the laboratory (which in itself causes stress and may falsify the result), the patient receives a set of test tubes (salivette) with a special cotton swab. Saliva collection involves chewing a cotton swab for about 2 minutes. Samples are usually taken 3-4 times a day (e.g. morning, noon, afternoon and before bed), which allows for the creation of an accurate daily hormone curve. The samples are then sent by courier to the indicated laboratory.
Frequently asked questions (FAQ)
What is cortisol and why does it increase under stress?
Cortisol is an adrenal hormone that mobilizes the body in dangerous situations (the "fight or flight" response). It raises blood glucose levels and increases your heart rate to provide energy to your muscles.
How to prepare for a cortisol level test?
Before the examination, you should avoid intense physical exercise, drinking coffee, alcohol and smoking. In the case of a saliva test, you should not eat, drink or brush your teeth 30 minutes before collection.
What are home remedies to lower cortisol?
The most effective methods include: regular, healthy sleep (at least 7-8 hours), moderate physical activity (e.g. walking, yoga), avoiding excess caffeine, supplementing with ashwagandha or omega-3 acids, and relaxation techniques.
What is "adrenal fatigue" and does it exist in medicine?
The term "adrenal fatigue"adrenal fatigue) is a popular theory in alternative medicine for chronic stress exhaustion. Evidence-based medicine (EBM) does not recognize this disease entity - adrenal gland disorders are diagnosed as specific hypofunctions (e.g. Addison's disease).
Does high cortisol make it difficult to lose weight?
Yes. Chronically elevated cortisol promotes the deposition of fat tissue (especially visceral fat around the abdomen), increases appetite for sweet and fatty foods, and blocks fat burning.