Cortisol test: measure your cortisol level

• Measure your blood cortisol level, the most important stress hormone, produced by your adrenal glands.
• Provides insight into complaints such as persistent fatigue, weight fluctuations, sleep problems, or the feeling of being constantly stressed.
• Standalone test: no extensive package needed if you want to check your cortisol level specifically.
• Results assessed by BIG-registered physicians, with a clear explanation of your result.

For the most reliable result, preferably have blood drawn in the morning between 7 and 9 a.m., in a relaxed state. Cortisol has a pronounced diurnal rhythm with the highest values ​​early in the morning and a clear decline during the day, making a morning measurement the most representative and best comparable to reference values. A healthcare professional draws the blood from a vein in your arm; this usually takes only a few minutes.

What does this cortisol test measure?

This test measures your blood cortisol level at the time of collection. Cortisol is produced in the adrenal cortex and controlled by the pituitary gland, and plays a central role in your metabolism, inflammation inhibition, and the way your body responds to stress. Because the value can fluctuate significantly throughout the day, your result is assessed against the reference values ​​corresponding to the time of collection.

Who is the cortisol test for?

This standalone cortisol test is for anyone who wants to know specifically where their cortisol level stands. Persistent fatigue, unexplained weight gain around the abdomen or conversely weight loss, sleep problems, high blood pressure, or the feeling of constantly being "on" are common reasons to get tested. A measurement can also provide clarity in cases of prolonged stress, after long-term use of corticosteroid medication, or when there is a suspicion of under- or overactive adrenal function. You do not need to have symptoms to book this test; many people test preventively to see how their body handles stress.

When should you choose the cortisol test rather than a complete blood test?

Do you only want to check your cortisol, for example, because you specifically want to confirm a suspicion of prolonged stress or adrenal exhaustion? Then this standalone cortisol test is the fastest and most affordable option. Are you unsure, however, what exactly lies behind symptoms such as fatigue or weight changes? In that case, a broader package such as the Health Check Essential or Health Check Premium is often a more logical choice: that package checks, among other things, your thyroid function (TSH) and iron status (ferritin), two other common causes of the same symptoms, along with 30+ other markers for a complete picture. Cortisol itself is not included in our standard packages; If you want to combine it, simply book the cortisol test separately alongside a broader blood test.

How does it work?

You order the test online and make an appointment at a blood collection location near you. A healthcare professional draws the blood, and within 2 to 5 working days you will receive your results clearly presented in our portal, with a clear explanation and assessed by our doctors.

Frequently Asked Questions

Do I need a referral for the cortisol test?

No, you do not need a referral from your GP. You order the test directly from Zample and then activate your own digital request.

Do I need to be fasting for the cortisol test?

No, fasting is not mandatory for the cortisol test. More important is the timing: preferably have your blood drawn between 7 and 9 a.m., in a relaxed state, because your cortisol level is highest and most representative at that time.

What does a high cortisol level mean?

An elevated cortisol level can indicate prolonged stress, but also a medical cause such as Cushing's syndrome, an overactive thyroid, or the use of corticosteroid medication. Symptoms associated with this may include weight gain around the abdomen, a fuller face shape, high blood pressure, sleep problems, and mood swings. Always discuss an abnormal result with your GP.

What does a low cortisol level mean?

A low cortisol level can indicate reduced function of your adrenal glands or pituitary gland, for example in Addison's disease. Typical symptoms are exhaustion, muscle weakness, low blood pressure, and weight loss. This is also a result you should always discuss with your GP, especially in combination with symptoms.

Can persistent stress affect my cortisol level?

Yes. With prolonged psychological or physical stress, your adrenal glands remain continuously stimulated to produce cortisol, which can eventually lead to a structurally elevated level. A measurement gives you a concrete starting point to discuss this with a doctor, rather than relying solely on a gut feeling.

What is the difference between the cortisol test and a self-test at the drugstore?

A self-test at a drugstore, for example, usually only provides an indicative result and is not always analyzed in an accredited laboratory. Our cortisol test is a comprehensive blood test performed via a blood draw, analyzed at an accredited laboratory and assessed by a BIG-registered physician for a medically reliable result.

Why is the time of blood collection so important for the cortisol test?

Cortisol follows a distinct diurnal rhythm: the value peaks early in the morning and then gradually decreases. Therefore, a morning measurement and an afternoon measurement are assessed against different reference values. Without a fixed time, a result is difficult to interpret, which is why we recommend a morning sample.

How quickly will I receive the results of my cortisol test?

Usually within 2 to 5 working days after your blood draw, clearly presented in our portal and assessed by a BIG-registered physician.

Can I combine a cortisol test with a more extensive blood test?

Yes. Would you prefer to have a broader investigation into the underlying causes of symptoms such as fatigue or weight changes in a single procedure? In that case, for example, the Essential Blood Test is a logical addition: that package checks, among other things, your thyroid and iron status, two other common causes of the same symptoms.