Testosterone is a steroid hormone that is made by the testes in men and ovaries in women. It is also produced in small quantities in the adrenal glands in both sexes.
The majority of Testosterone produced in the ovary is converted to oestradiol. The levels of Testosterone in women are around 1/10th of those in men.
Testosterone is responsible for the development of male characteristics and signals the body to make new blood cells, ensures bone and muscle stays strong and enhances libido both in men and women. Testosterone is also important in maintaining the emotional and mental state of both men and women and has been found to improve memory, mood and vitality.
Testosterone levels are released in a diurnal pattern where the highest levels in men are usually found in the early morning for those that work day shifts.
Low concentrations are usually found in women with slightly higher values during the luteal phase of the menstrual cycle.
The normal reference range of Total Testosterone is:
Women: 0-1.8 nmol/L
Men: 7.6-31.4 nmol/L
Low levels of Testosterone can have a significant impact on the body. Typical symptoms of Testosterone deficiency include:
– Reduced libido;
– Loss of muscle mass and strength;
– Reduced bone density and/or osteoporosis;
– Aches and pains in bones and joins;
– Low mood / depression;
– Loose skin; and
– Low energy/fatigue.
Low levels of Testosterone are often linked with fluctuation of other hormones such as DHEA.
Testosterone is used in BHRT to relieve these symptoms of the peri-menopause, menopause and andropause (male menopause).
* Reference ranges provided by The Doctors Laboratory (TDL) and subject to change if/when methods are re-standardised from time to time.