Testosterone

You should get a testosterone test if men have low libido, erectile dysfunction, fatigue, reduced muscle mass, mood changes, or infertility. Women may need it for excess facial or body hair, acne, hair thinning, or irregular periods. It is also recommended for early or delayed puberty in boys, and for monitoring testosterone therapy.

Fasting for 8–12 hours is often recommended before a testosterone test, as eating can lower testosterone levels. Give your sample in the morning (around 7–10 AM), when levels peak. Women should ideally test on days 2–5 of the menstrual cycle. Inform your doctor about testosterone therapy, steroids, or hormonal medicines, and avoid testing during acute illness.

Fasting is often recommended for a testosterone test. You may be asked to fast for 8–12 hours, drinking only water, as eating can temporarily lower testosterone. Give your sample in the morning (around 7–10 AM), when levels are highest. Follow your doctor's or lab's specific instructions.