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1 in 4 men affected¹
All content on this page has been medically reviewed by: Hassan Thwaini, Clinical Pharmacist and Copywriter, Master of Pharmacy (MPharm) on 30 March, 2026. GPhC Registration: 2221320View profile
Deep dive into your health
Test and track the total level of testosterone in your blood, a hormone essential for sex drive, muscle mass, fertility, and mood. This test can establish whether you have low testosterone levels.
Low testosterone: the hidden health crisis
Low testosterone can harm your wellbeing, and health issues can worsen it. Numan dives deep to get to the root of the problem.
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Low-T in 1/3 of ED cases in over 65s²
Testosterone deficiency reduces libido, impairs blood flow to the penis, and affects penile tissue health
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90% of men with low testosterone go untreated³
In fact, many men are misdiagnosed with having depression
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Up to 2x more likely if overweight or diabetic⁴
Men who are obese or have type 2 diabetes face a significantly higher risk of low testosterone
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Up to 4.4 times more likely to be depressed⁵
Low testosterone is strongly associated with an increased risk of depression
SYMPTOMS
The signs of low testosterone
If these symptoms⁶ are holding you back, at-home blood tests can provide an easy and straightforward way to assess your testosterone levels.
Erectile dysfunction
Decreased libido
Fatigue
Poor sleep
Mood changes
Difficulty concentrating
Loss of muscle mass
Increased body fat
NUMAN BLOOD TESTS
How it works
STEP ONE
Order your at-home test
Order your at-home test and get free 48-hour letterbox delivery.
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STEP TWO
Collect your blood sample
Follow the simple instructions in your blood test. Return your sample for free.
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STEP THREE
Get personalised results
Within 3–5 days, you’ll receive personalised results showing whether your testosterone levels are low, along with clear, actionable advice from our experts.
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Testosterone treatment
An effective way to raise testosterone levels
Low testosterone levels can be effectively managed with TRT. Take the first step to find out if you're eligible — with a quick, at-home blood test. Here’s what you can expect as your treatment takes effect and your testosterone levels rise.⁷
Month 1-3
Higher libido
Stronger erections
Improved mood and energy
Improvement in inflammation markers
Early fat loss and muscle gain
Month 3-6
Higher strength and endurance
Improved cardiovascular health
Reduced risk of type of 2 diabetes
Further fat loss
Month 6 onwards
Higher bone density
Improved cognition
Faster recovery
Ongoing reduction in visceral fat
Key insights into your testosterone
What is testosterone?
Testosterone is a sex hormone that’s vital for men’s health. Produced in the testes, the hormone supports key male functions including sex drive, ability to get and maintain erections, fertility, muscle mass, and mood.
Why is testosterone important?
To ensure healthy bodily functions, you must have a certain level of the hormone. Lower levels of the hormone can, in some cases, impact libido, sexual function, energy, muscle mass, and mood.
What insights will I get?
The Testosterone Blood Test measures five key biomarkers to give you an accurate testosterone reading. See the descriptions below for each biomarker tested.
BIOMARKERS
Which biomarkers are tested?
Click on each biomarker to get insights into what it is and how it affects your health.
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UK DOCTORS AND CLINICIANS
Your expert team
Specialists in medicine, nutrition, performance, and diagnostics.
Dr Dimitris Schizas
Numan Doctor
MBBS MRCGP MSC BSSM
Dr Michael Lacey
Numan Doctor
MBChB BSc (Hons) MRCGP
Dr Tom Anderson
Clinical Product Lead
MBBS MRCGP
Abby Watts
Senior Nurse Prescriber
BSc Adult Nursing, IP
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FAQS
Your questions answered
Biomarkers are a range of measurable health indicators. For example, your testosterone reading is a biomarker. If your biomarkers fall outside of the expected levels, it could suggest an underlying issue.
This test tracks the testosterone levels in your blood, a hormone essential for sex drive, muscle mass, fertility, and mood. This test can establish whether you have low testosterone levels.
Each blood test is easy to use, even if you’ve never used a home blood test kit before.
It only takes a small amount of preparation to successfully collect a blood sample and all the equipment you need to do so is included in the kit.
A summary of how to use the tests:
Wash your hands in warm water for 4 minutes and then dry them.
Use the lancet provided to prick your finger and collect a blood sample.
Post your sample to our accredited partner laboratory using the prepaid envelope included with your test.
Full instructions are provided with your test, which you should read thoroughly before use to ensure the best results.
To learn more about how to take a blood test at home, click here.
You should receive your blood test results three to five working days after you post your blood samples.
You’ll get an email notifying you that your results have arrived in your Numan account, so keep an eye on your inbox so you don’t miss them. Additionally, you’ll receive a written review of your results from one of our clinicians, which you can read alongside your results to help you understand them.
Once they’re in your account, you can view your results any time you wish. You can also view them in-app and save your results as a PDF to help you keep track of them (and show them to your GP if need be).
Yes. It’s designed to be taken at home and we’ve included detailed instructions to help you through the process. We’ll also break down your results into simple, easy-to-understand language, so you’ll learn where you stand and how you can improve your heart health.
It’s generally a good idea to take your test every few months, although since every patient is different there’s no set timescale. If you’re unsure, you can ask our clinical team.
Each test is a finger prick test, so you may feel a small scratch when you use the lancet provided with it to take a blood sample. This is only temporary, and any discomfort should subside swiftly afterwards.
Small changes to your biomarkers are normal and generally nothing to worry about. However, any significant changes in your health markers should prompt a discussion with a healthcare professional. They can provide context, possible explanations, and guidance.
The test can only indicate rather than diagnose health issues. If you’re worried and suspect you might have an underlying health condition, we advise speaking to your regular doctor first. If you get any unexpected or unusual test results, this should also be flagged and discussed in more detail with your doctor.
If you're experiencing symptoms such as fatigue, decreased libido, erectile dysfunction, or other physical and emotional changes, you might have low testosterone.
A blood test is the only reliable way to determine your testosterone levels. If your levels are clinically low, your doctor might recommend TRT as a treatment option to restore normal levels and improve your health and wellbeing.
TRT can significantly improve quality of life by alleviating symptoms of low testosterone. Benefits often include increased energy levels, improved mood, heightened libido, better erectile function, increased muscle mass, and decreased body fat. It’s important to consult with a healthcare professional to discuss the potential benefits and risks based on your specific health condition.7
You can read more here.
The effects of TRT can be felt within just a few weeks, but full benefits may take several months to manifest. The timeline can vary depending on the individual's baseline testosterone levels, the form of therapy chosen, and their overall health. Regular follow-up with a healthcare provider is crucial to monitor the therapy's effectiveness and make any necessary adjustments.7
REAL PEOPLE, REAL IMPACT
Over 800,000 people have come to us to improve their health
I put off getting a private blood test for 12 months and felt terrible for all of that time. If I’d gone ahead 12 months ago my issues could have been resolved then.
I have been trying through the NHS for 3 years and had no success. Once Numan highlighted what the deficiency was I got my doctor to confirm the results which were indeed accurate.
Refreshingly quick and easy to complete. The results were back in two working days with a succint, clear and useful analysis along with the full results.
Knowledge
Blood tests: what you need to know
References
¹ Andre B. Araujo, Gretchen R. Esche, et al. Prevalence of Symptomatic Androgen Deficiency in Men, The Journal of Clinical Endocrinology & Metabolism, Volume 92, Issue 11, 1 November 2007, Pages 4241–4247
² Rabijewski M, Papierska L, Kozakowski J, Zgliczyński W. The high prevalence of testosterone deficiency in population of Polish men over 65 years with erectile dysfunctions. Aging Male [Internet]. 2012;15(4):258–62. Available from: http://dx.doi.org/10.3109/13685538.2012.729233
³ Layton JB, Li D, Meier CR, Sharpless JL, Stürmer T, Jick SS, et al. Testosterone lab testing and initiation in the United Kingdom and the United States, 2000 to 2011. J Clin Endocrinol Metab [Internet]. 2014;99(3):835–42
⁴ Wang C, Jackson G, Jones TH, Matsumoto AM, Nehra A, Perelman MA, et al. Low testosterone associated with obesity and the metabolic syndrome contributes to sexual dysfunction and cardiovascular disease risk in men with type 2 diabetes. Diabetes Care [Internet]. 2011;34(7):1669–75. Available from: http://dx.doi.org/10.2337/dc10-2339
⁵ Indirli R, Lanzi V, Arosio M, Mantovani G, Ferrante E. The association of hypogonadism with depression and its treatments. Front Endocrinol (Lausanne) [Internet]. 2023;14. Available from: http://dx.doi.org/10.3389/fendo.2023.1198437
⁶ Morales A, Bebb RA, Manjoo P, Assimakopoulos P, Axler J, Collier C, et al. Diagnosis and management of testosterone deficiency syndrome in men: clinical practice guideline. CMAJ [Internet]. 2015;187(18):1369–77. Available from: http://dx.doi.org/10.1503/cmaj.150033
⁷ Saad F, Aversa A, Isidori AM, Zafalon L, Zitzmann M, Gooren L. Onset of effects of testosterone treatment and time span until maximum effects are achieved. European journal of endocrinology. 2011;165(5): 675–685
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