Testosterone receptor signalling
Biomarker library
Hormonal Health
Testosterone
Testosterone is the main male sex hormone, made by the testes. Women make smaller amounts in the ovaries and adrenal glands.
Measured in your health assessment, with a doctor to explain your result. Book yours
Why it matters
It builds muscle and bone, drives libido and sperm production, and affects energy and mood. Levels peak in the early morning, which is why it is best measured before 11 am.
What a result can mean
Lower than the range
Low testosterone in men can cause low libido, erection problems, tiredness and loss of muscle. It is linked with obesity, type 2 diabetes, poor sleep, heavy drinking, some medicines and pituitary or testicular conditions, and it falls gradually with age.
Higher than the range
In men, high levels usually come from testosterone or anabolic steroid use. In women, raised testosterone is most often due to polycystic ovary syndrome, which can cause excess hair, acne and irregular periods.
What can help
Losing excess weight, regular exercise (especially strength training), good sleep and less alcohol can all raise a low testosterone. Men with consistently low levels and symptoms may be offered testosterone treatment once the cause has been assessed.
Read it with
NoteGeneral educational illustration. Colours, sizes and movement are simplified. This is not a scan or a simulation of your body. General information, not personal medical advice: a doctor reads your own results with your history.
Know your testosterone.
Measured in your health assessment and explained by the doctor who reviews your results.