FSH is produced by the pituitary gland in the brain and is essential for pubertal development and the function of a women’s ovaries (stimulates the growth of unfertilised eggs in the ovary and increases production of Oestradiol) and men’s testes (stimulates sperm production).
FSH levels in men after puberty are relatively constant. However, in women FSH levels will rise as the ovaries stop functioning at menopause.
The reference range of FSH in women is:
Follicular: 3.5-12.5 IU/L
Mid-cycle: 4.7 – 21.5 IU/L
Luteal: 1.7 – 7.7 IU/L
Post-menopausal: 25.8-134.8 IU/L
* Reference ranges provided by The Doctors Laboratory (TDL) and subject to change if/when methods are re-standardised from time to time.