Why get tested?
To determine if your testosterone levels are abnormal, which may help to explain difficulty getting an erection (erectile dysfunction), inability of your partner to get pregnant (infertility), or premature or delayed puberty if you are male, or masculine physical features if you are female

When to get tested?
If you are male and your doctor thinks that you may be infertile or if you are unable to get or maintain an erection; if you are a boy with either early or delayed sexual maturity; if you are a female but have male traits, such as a low voice or excessive body hair, or are infertile or have irregular periods

Sample required?
A blood sample drawn from a vein in your arm