Testosterone bioactive
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This test measures your level of bioactive testosterone, also known as free testosterone, which provides a more accurate picture of how much testosterone is actually available to your body's cells. Testosterone is an important sex hormone in both men and women and influences a range of physiological functions, including energy levels, muscle mass, libido, and mental health.
The majority of testosterone in the blood is bound to proteins – mainly sex hormone-binding globulin (SHBG) and albumin – which makes it less biologically available. Free testosterone, however, is the active portion, meaning it can be directly absorbed by cells and exert its hormonal effects. Therefore, measuring free testosterone often provides a more accurate assessment than total testosterone, especially when SHBG levels are abnormal.
Testosterone is primarily produced in the testicles in men and in the ovaries in women, and it affects not only sexual function but also several other important bodily processes. Bioactive testosterone – the unbound, free form – typically represents 1–2% of total testosterone, but is the most relevant portion from a clinical standpoint.
Understanding your free testosterone levels can be crucial in identifying testosterone deficiency. Low levels may lead to symptoms such as fatigue, reduced muscle strength, decreased libido, mood changes, or difficulty concentrating. This test gives you valuable insight into your hormonal health and can be an important part of broader investigations into fatigue, fertility issues, or reduced performance.
Free testosterone levels are calculated using a formula that considers your SHBG and albumin levels – two proteins that bind to testosterone in the blood and affect how much is freely available to your body’s cells.
Low levels of free testosterone are associated with low energy, reduced sex drive, poor sleep quality, and general fatigue. Both physical and mental stress can negatively impact testosterone production. In women, elevated levels may lead to symptoms such as increased body hair, acne, or irregular menstrual cycles – for example, in cases of PCOS. In men, elevated levels can contribute to prostate enlargement.
If your results show low levels of free testosterone, you may fall within the range for testosterone deficiency, also known as hypogonadism. This condition should be monitored, especially if you're experiencing symptoms that affect your quality of life.
Testosterone levels fluctuate significantly throughout the day, with the highest levels typically occurring in the early morning. For this reason, it is recommended that you take the test before 10:00 AM after a full night’s rest to ensure the most accurate results.
Hormones are chemical messengers that regulate body functions, affect your well-being, and control important processes such as metabolism, growth, and reproduction. They are produced in endocrine glands and spread through the blood to various organs and tissues.
Before visiting a reception for sampling, you need to do the following:
Activate referral and select reception
To activate your referral, simply follow the instructions that you will receive via email after completing the purchase. The email contains an activation code, by clicking on the link in the email you enter the flow to fill in any information, activate the referral and select reception in the sample answer service zample.
Before the sampling
The referral is available digitally at the sampling unit after you activate it, follow the instructions you receive via email. Here you can read our guidelines before taking samples.
Get control of your health - four simple steps
Choose a health check or create your own by adding optional health tests to your cart.
After payment, you will receive an activation code via email. Log in via "My test results" or click on the link in the email, and use the code to activate the referral and choose reception.
You visit the chosen reception to do your test. Your referral is valid for 5 months after activation.
You will receive your test answers within 1-5 working days, the test answers are received continuously. Once all test results are received, they are reviewed and issued by a doctor.
With us you always get:
Qualitative analysis
To offer you the highest possible quality and service we collaborate with accredited laboratories and trained healthcare personnel.
Lowest possible price
Our vision is that as many people as possible should have the opportunity to improve their health. That's why we always strive to keep prices low.
Your needs – your choice
With us, you can always choose freely among all our health markers and design your own personal health check based on your needs.
Quick test results – reviewed by doctors
Within 1-5 working days you will receive your test results, these are reviewed and assessed by a doctor. In the event of significantly deviating test answers, you will be called. You can also make an appointment with a doctor for a personal review.
Gives a blood test before a health check
Take health into your own hands
Understand what is happening in your body - with insight into your values, you can take control of your well-being and make any adjustments in your lifestyle.
A healthy and varied diet is said to be a trick to reduce the risk of ill health, with full insight into your health data you can see the balance of your vitamins, minerals and hormones.
Your lifestyle choices affect your general health, based on your values you can create the conditions for increased well-being - and a healthier life.
Yes, you can buy all tests and health checks with us for another person. After you complete a purchase, you will receive an email with an activation code. The activation code is not personal, which means that you can give the activation code to any person. The person who is to use the code needs to have a Swedish social security number or a valid reserve number.
Read moreNo, blood tests do not replace contact with the healthcare system, which together with medical history, clinical examinations and possible blood tests can make a diagnosis.
Read moreYou submit your test at any reception that is available all over Sweden, see the "receptions" tab in the menu. The sampling is carried out by trained healthcare personnel, so you can feel confident in your choice of sampling unit and in your meeting with the staff who work for them and who perform the sampling when you leave your blood sample intravenously. Analysis of your blood samples takes place at Sweden's leading accredited laboratory Synlab, Unilabs or Karolinska University Laboratory.
Read moreTo create your own referral select the specific markers you want to test for in the shopping cart. When you complete your purchase, a separate referral is created based on your choices.
Read moreIt usually takes 1-5 working days to get your test results, these are sent to you continuously as the analysis is done. The doctors comment will appear in the final report when all test results have been received, provided it is included in your analysis.
Read moreAdd the health check or tests you want to carry out to the shopping cart, go to checkout and choose the payment option that suits you. After completed payment, we will send an email with an activation code for your referral. You use the activation code in the sample response service "My journal" to activate the referral and select the reception where you want to leave your samples.
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