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We recommend that you do not collect or post samples between Tuesday 31st and Sunday 5th June.

Cortisol Blood Test

Cortisol Blood Test


A 9am cortisol blood test used to assess stress levels and to help diagnose disorders of the adrenal glands.
Blood sample 1 biomarker included Results estimated in 2 working days from sample receipt at lab
Cortisol Blood Test
Cortisol Blood Test
Cortisol Blood Test
Cortisol Blood Test
Cortisol Blood Test

Is it for you?

Do you experience high levels of stress in your life which you think could be affecting your stress hormones? Or are you an athlete who is worried about over training syndrome? Perhaps you have symptoms which you think could be related to your adrenal function. If you want a quick finger-prick blood test to check your early morning levels of cortisol, then this is the right test for you.

What's included?

Biomarker profile

  • Adrenal Hormones

Adrenal Hormones (1 Biomarker)

Special instructions

Please take your sample as soon as possible after waking. Your result could be affected by corticosteroid medication (e.g. prednisolone). Ask your doctor whether you should stop before testing. HRT and the contraceptive pill can affect the results of this test, taking the test during a break from these will give more accurate results. Do not take biotin supplements for 2 days prior to this test. If you are taking prescribed biotin you should discuss this with your doctor.

From the expert

A cortisol blood test should be taken in the morning to measure your cortisol levels close to waking. This is when cortisol levels are highest as your body prepares for the day ahead. Although cortisol is associated with stress, it is also important for many other functions including your immune function, blood pressure regulation and for controlling insulin to maintain blood sugar levels. Cortisol is a steroid hormone, produced by the adrenal glands. Cortisol's role in stress is well known; it is secreted in higher quantities during the body's 'fight or flight' response to danger, and leads to a number of bodily changes as your body prepares to deal with the perceived threat. Modern lives, with constant stimulation, work and social pressures can lead to cortisol being constantly high. 

A cortisol blood test will help you identify whether you are experiencing too much stress and should take measures to reduce it. Stress is not just mental and emotional, it can be physical too. Athletes who overtrain can have high levels of cortisol in their blood.

This test establishes the levels of cortisol in the blood at 9am and can help identify medical conditions such as Cushing's syndrome, which is caused by too much cortisol, or Addison's disease, which is caused by damage to the adrenal glands and is associated with too little cortisol.

Dr Sam Rodgers MBBS, MRCGP
Chief Medical Officer

Why take this test?

  • You want to check your stress levels with a simple finger-prick blood test
  • You feel constantly run-down and think stress may be the cause
  • You are experiencing symptoms which you think might be related to your adrenal function
  • You are an athlete who wants to check for overtraining

Laboratories you can trust

Trusted by the NHS and private clinics alike, you can be sure of the highest testing standards from our UKAS accredited partner laboratories.

Dr Sam Rodgers - Chief Medical Officer

Expert advice with your results

Get trusted advice and comments from one of our doctors based on your results.

Your personal health centre

Your personal health centre

Discover the easy way to track your health through our online portal, View your results with doctor's advice, monitor any changes over time and see the improvements you can make to your health with simple lifestyle changes.

Questions? Let us help
Questions? Let us help

Questions? Let us help

Our customer care team is on-hand to help you find the test that's right for you. Get in touch via phone, live chat or email.


Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.