Testosterone is a steroid hormone secreted by testis. It is the main androgen in human body, which is related to the development of male secondary sexual characteristics.
Adults with normal testosterone:
Male14 ~ 25.4 nmol/l.
Female1.3 ~ 2.8 nmol/l.
Male children < 8.8 nmol/L.
Children and girls < 0.7 nmol/L.