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Most men wait too long. The symptoms have been present for a year, maybe two. They have been attributed to work stress, age, or just life. Then someone tests and finds out their testosterone has been in the floor the whole time.
Do not wait. If any of the symptoms below sound familiar, test now.
Medichecks Advanced Male Hormone
Total testosterone, SHBG, free testosterone, LH, FSH, oestradiol, and thyroid. Doctor-reviewed results in 48 hours. The right panel for any man with symptoms, not just a single number, the full picture.
The symptom checklist
These are the symptoms consistently associated with low or low-normal testosterone in the clinical literature. They are not diagnostic on their own, many other conditions produce the same picture, but they are the indications to test.
Quick Comparison
| Symptom | How low T causes it | Also caused by |
|---|---|---|
| Persistent fatigue | Testosterone drives mitochondrial energy production | Thyroid, anaemia, sleep apnoea, depression |
| Low libido | Testosterone is the primary driver of male sexual desire | Relationship factors, medications, stress |
| Difficulty building or keeping muscle | Testosterone drives protein synthesis and satellite cell activity | Overtraining, poor sleep, inadequate protein |
| Increased belly fat | Low T reduces lipolysis, promotes visceral fat deposition | Insulin resistance, poor diet, sedentary lifestyle |
| Brain fog / poor concentration | Testosterone supports cognitive function and dopamine | Sleep deprivation, stress, thyroid |
| Low mood / flat affect | Testosterone modulates serotonin and dopamine receptors | Depression, stress, low vitamin D |
| Poor sleep | Testosterone and sleep quality have a bidirectional relationship | Sleep apnoea, stress, caffeine, screen use |
| Reduced motivation and drive | Testosterone influences dopaminergic reward pathways | Burnout, depression, life circumstances |
- How low T causes it
- Testosterone drives mitochondrial energy production
- Also caused by
- Thyroid, anaemia, sleep apnoea, depression
- How low T causes it
- Testosterone is the primary driver of male sexual desire
- Also caused by
- Relationship factors, medications, stress
- How low T causes it
- Testosterone drives protein synthesis and satellite cell activity
- Also caused by
- Overtraining, poor sleep, inadequate protein
- How low T causes it
- Low T reduces lipolysis, promotes visceral fat deposition
- Also caused by
- Insulin resistance, poor diet, sedentary lifestyle
- How low T causes it
- Testosterone supports cognitive function and dopamine
- Also caused by
- Sleep deprivation, stress, thyroid
- How low T causes it
- Testosterone modulates serotonin and dopamine receptors
- Also caused by
- Depression, stress, low vitamin D
- How low T causes it
- Testosterone and sleep quality have a bidirectional relationship
- Also caused by
- Sleep apnoea, stress, caffeine, screen use
- How low T causes it
- Testosterone influences dopaminergic reward pathways
- Also caused by
- Burnout, depression, life circumstances
If you have three or more of these symptoms consistently for more than six weeks, testing is warranted. If you have five or more, test this week.
I had six of these for the best part of 18 months before I tested. I assumed it was the job, the disrupted sleep, being in my late 30s. It was all of those things, and also 8.4 nmol/L testosterone with elevated SHBG. The two things were connected. Testing gave me something to actually do about it rather than just accepting it.
When NOT to test
Timing matters for accurate results. Avoid testing in these circumstances:
Immediately after intense exercise. Heavy training acutely suppresses testosterone for 24 to 48 hours. Test on a rest day or light activity day.
During illness. Any systemic illness suppresses testosterone. Wait until fully recovered.
After poor sleep. One night of 5 hours or fewer can reduce testosterone by 10 to 15%. If you slept badly, reschedule.
After significant alcohol. Alcohol suppresses testosterone for 24 to 72 hours depending on quantity.
In the afternoon. Testosterone peaks between 7am and 10am and declines through the day. An afternoon test can read 20 to 30% lower than a morning reading on the same person.
The right timing for a morning test
Test between 8am and 10am. Fast from the night before, water is fine. A light breakfast is acceptable but a full meal can transiently affect readings.
For a venous blood draw (the most accurate method), book an early morning appointment at a Medichecks clinic. For a home finger-prick test, do it immediately after waking, before coffee, before eating.
Which test to order
Do not test total testosterone in isolation. A single number without SHBG, LH, and free testosterone is nearly uninterpretable. This is the mistake most GPs make when they do test, they return a total testosterone result in the normal range and close the case, missing elevated SHBG that explains the symptoms entirely.
The minimum useful panel: total testosterone, SHBG, free testosterone (calculated), LH, FSH.
The optimal panel adds: oestradiol (aromatisation), prolactin (pituitary), full thyroid panel (TSH, fT3, fT4, thyroid dysfunction mimics low T closely), and a basic metabolic panel.
The Medichecks Advanced Male Hormone covers everything that matters. If cost is the main consideration, their basic hormone panel covers the essentials at lower cost.
NHS vs private
Your GP can order a testosterone test. What they will usually order is total testosterone only, processed through an NHS lab, with results interpreted against the NHS normal range (8 to 29 nmol/L) that is too broad to be clinically useful in most cases.
Getting SHBG added is inconsistent, some GPs will add it if you ask, others will not. LH and FSH are usually only tested if total testosterone comes back clearly below the range floor.
Private testing through Medichecks gives you the complete panel with doctor review for roughly the same cost as a private GP appointment. The doctor review is the key differentiator, your result is checked by a qualified doctor before release, and any out-of-range values are flagged with context.
For a full comparison of private blood testing services in the UK, the home blood test comparison covers Medichecks, Forth, Lola Health, and Thriva.
What to do if results are low
One low reading is not a diagnosis. Repeat the test, ideally at the same time of day, under the same conditions, at least two to four weeks apart. Two consistently low morning readings with matching symptoms is a clinical picture.
From there: see a private TRT clinic or a GP with hormone expertise. Take both test results, your symptom history, and the full panel. The TRT clinic comparison covers which clinics in the UK are worth considering and what the process looks like.
If you have symptoms, test now, not in six months when you have convinced yourself it will resolve on its own. Testing is cheap, fast, and either gives you an answer or rules testosterone out so you can look elsewhere. Both outcomes are useful.
Further reading
- How to read your testosterone blood test results
- Home blood testing services UK, full comparison
- Testosterone levels by age UK, what's normal
- Best TRT clinics UK 2026
Affiliate disclosure: This article contains an affiliate link to Medichecks via Awin. If you purchase through this link, Male Optimal earns a small commission at no extra cost to you. This does not affect recommendations.
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