Do I have low testosterone? How to tell.

The only way to know for certain is a morning blood test, but a cluster of symptoms, especially low libido, fatigue and lost strength, tells you whether it is worth checking.

Symptoms point the way before any needle does. The most telling combination is a reduced sex drive plus persistent tiredness and loss of muscle or strength, often with low mood, brain fog, weaker morning erections and more belly fat. One symptom on its own rarely means much, because each overlaps with stress, poor sleep and low mood, but several together raise the odds. You can map your own against the full list in the symptoms of low testosterone.

The screening questionnaires you find online are worth treating with care. Tools such as the ADAM questionnaire are sensitive, meaning they rarely miss a man who is low, but they are not specific, so they flag plenty of men who turn out to be fine. A "yes" on a quiz raises the question; it does not answer it.

Confirmation comes from a blood test taken before 10am, measuring total and free testosterone plus SHBG, because testosterone is highest in the morning and an afternoon sample can make a normal man look low. A genuinely low result on two separate morning tests, alongside symptoms, is what actually defines the condition. A single borderline figure is the most common false alarm, which is why one reading is never enough. It also helps to compare your figure against an age-appropriate range rather than a single cut-off, set out in normal testosterone levels by age.

What to do: run through a structured symptom check first, then book a morning blood test to confirm. Our free testosterone self-check helps you weigh how the signs stack up before you see anyone. Do not diagnose yourself from one symptom or a single afternoon test, and do not start any treatment, prescribed or bought online, without a proper diagnosis. Whatever the result, the lifestyle basics help, so there is no harm in starting them while you wait.