FSH is a hormone produced by the pituitary gland that regulates growth and function of the ovaries in women and testes in men.

In women, FSH stimulates follicle development and plays a key role in the menstrual cycle.

In men, FSH supports sperm production.

Clinical uses include:

Assessing infertility in both men and women.

Evaluating menstrual irregularities and ovarian reserve.

Diagnosing pituitary gland disorders.

Investigating puberty disorders (delayed or precocious).

Monitoring menopause status.

Analyte: Serum FSH concentration (IU/L).

Normal Range (varies by lab):

Women (follicular phase): ~3–10 IU/L

Women (mid-cycle): ~4–25 IU/L

Women (luteal phase): ~2–8 IU/L

Postmenopausal women: ~25–135 IU/L

Men: ~1.5–12.4 IU/L

Abnormal Findings:

High FSH: Suggests ovarian failure, menopause, or testicular failure.

Low FSH: Indicates pituitary or hypothalamic dysfunction.

Clinical Use:

Provides a direct measure of reproductive hormone regulation.

Helps guide fertility treatment and reproductive endocrinology decisions.

Supports diagnosis of hormonal and pituitary disorders.