Testosterone testing can be important for both men and women.

Symptoms of low testosterone in men include reduced sex drive, erectile dysfunction, increased body fat and reduced muscle mass, changes in mood and sleep disturbances.

In women, symptoms of abnormal testosterone levels include excessive body hair, changes in body shape, acne, balding, menstrual irregularity and loss of libido.

You should speak with a GP if you are concerned about the symptoms of abnormal testosterone levels, as there are many serious conditions that can mimic these symptoms.

Testosterone levels go up and down during the day, with levels tending to be highest in the earlier in the day. For this reason it is best to collect your sample early in the morning if you can.