Chronic stress that gradually exhausts the body has become an invisible companion of modern life. Prolonged tension affects the nervous, cardiovascular and endocrine systems and can influence sleep, appetite, body weight and immune function. The following symptoms most often make people consider having a medical examination: persistent fatigue, insomnia or shallow sleep, unexplained weight gain, increased anxiety and irritability. It can be difficult to assess your condition on your own, as subjective feelings do not always provide the full picture. A laboratory cortisol test can provide objective information about cortisol levels and the state of the hormonal system.
What Is Cortisol and Why Is It Called the «Stress Hormone»?
Cortisol is a steroid hormone produced by the adrenal cortex. It is often called the stress hormone because it helps mobilize the body's resources during stressful situations and supports adaptation to physical and emotional stress:
- regulates metabolism;
- increases blood glucose levels;
- raises blood pressure;
- temporarily suppresses the immune response so that the body can «focus» on dealing with a threat.
Normally, cortisol production follows a circadian rhythm: hormone levels are highest in the early morning (around 6–8 a.m.), helping a person wake up and begin daily activities, and gradually decrease throughout the day, reaching their lowest levels in the evening and at night. Therefore, when assessing cortisol levels, it is always important to consider the time of day when the sample was collected.
Symptoms of High and Low Cortisol Levels
Changes in the level of the stress hormone can manifest differently depending on the direction of the change.
Elevated cortisol levels may be associated with:
- high blood pressure and rapid heartbeat;
- persistent anxiety and irritability;
- sleep problems;
- weight gain, especially around the abdomen.
Low cortisol levels may be associated with:
- low blood pressure;
- general weakness and dizziness;
- chronic fatigue that does not improve even after prolonged rest.
These symptoms are nonspecific and may occur with other conditions, so they should not be used to make a diagnosis on their own. How can stress-related hormonal changes be assessed? Laboratory testing may be recommended.
How to Measure Stress Levels: Main Methods
Different methods can be used to assess stress: psychological questionnaires, self-assessment scales, specialist consultations and laboratory tests. However, psychological questionnaires and stress scales provide only a subjective assessment of well-being, as they depend on how objectively a person can evaluate their own condition. A consultation with an endocrinologist allows the doctor to take a medical history and determine which examinations may be appropriate. To obtain a more objective picture, laboratory testing can be used to measure the actual concentration of cortisol and assess the hormonal system.
Persistent fatigue, sleep problems, changes in weight, anxiety or irritability do not necessarily indicate an abnormal cortisol level. These symptoms can have many different causes, so it is important not to try to determine your “stress level” based on how you feel alone. If symptoms persist for a long time, you should consult a doctor who can assess your symptoms, medical history and, if necessary, recommend appropriate tests. Cortisol test results should also be interpreted taking into account the time of sample collection and other clinical information.
What Types of Cortisol Tests Are Available?
Three main types of biological samples are used for cortisol testing: blood, saliva and urine. Each method has its own characteristics and indications, so the choice of a particular method is usually determined by a doctor based on the clinical situation.
Blood Test for Cortisol
A blood test is one of the most common ways to assess cortisol levels. It shows the hormone level at the time the sample is collected.
Blood is usually collected in the morning, typically between 7 and 10 a.m., when cortisol concentrations are higher. If necessary, a doctor may recommend another blood sample in the evening to assess whether the natural circadian rhythm is maintained. Reference ranges are provided with consideration of the time of day, so the result should be interpreted according to the time when the sample was collected.
Salivary Cortisol Test
Saliva is a convenient sample for assessing free (biologically active) cortisol over time. It allows several samples to be collected non-invasively (without the additional stress of a needle) during the day, for example, in the morning, afternoon, evening and before bedtime. This method is often used when a disturbance of the natural circadian rhythm of hormone production is suspected.
Urinary Cortisol Test (24-Hour Urine)
A 24-hour urine cortisol test measures the total amount of cortisol produced by the body over 24 hours. Unlike a single blood test, this method assesses the overall hormone production over the day. It is mainly used when Cushing syndrome or other endocrine disorders are suspected.
How to Prepare for the Test
To obtain the most reliable result possible, several recommendations should be followed:
- have the blood sample collected in the morning (usually between 8 and 10 a.m.), unless your doctor has recommended another time;
- avoid intense physical activity and stressful situations before the sample is collected, as they can temporarily increase cortisol levels;
- blood tests are usually performed after fasting for 8–12 hours; specific preparation requirements for saliva and urine collection should be clarified with the laboratory;
- several days before the examination, medications that affect hormone levels (such as glucocorticoids or oral contraceptives) may need to be temporarily discontinued in consultation with your doctor.
Which Doctor Should You Consult About the Results?
A therapist or family doctor may refer a patient for testing if their symptoms and complaints raise concerns about a hormonal imbalance. However, the results should be interpreted and treatment prescribed by an endocrinologist. It is not advisable to draw conclusions based solely on the numbers in a laboratory report: the results are assessed together with the time of testing, accompanying symptoms, medical history and, when necessary, additional examinations. Only a doctor can determine whether a change is a temporary functional deviation or may indicate an endocrine disorder.
How to Get a Cortisol Test at «Mamin Dim»
If you experience symptoms of chronic fatigue or exhaustion, you can undergo an examination in comfortable conditions at «Mamin Dim» clinic.
We offer the following types of laboratory testing:
- blood cortisol test – a quick way to assess the hormone level at the time of sampling;
- salivary cortisol test – a comfortable way to assess the daily cortisol rhythm without a needle;
- 24-hour urinary cortisol test – assessment of total cortisol production over 24 hours.
You can find preparation requirements, current prices and information about appointments with an endocrinologist in the relevant pricing section on the clinic's website.
A cortisol test is a useful diagnostic tool, but by itself it is only one part of the diagnostic picture. An objective assessment of the body's condition requires a comprehensive approach that takes laboratory results, medical history and the clinical picture into account, together with a doctor's consultation. Timely diagnosis can help clarify the body's condition and ensure appropriate medical care when needed.