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Follicle-Stimulating Hormone

FSH Follitropin
Serum (SST; day 1–3 of cycle for female baseline) IU/L

About this test

Pituitary gonadotropin stimulating follicle development (female) and spermatogenesis (male). Elevated FSH with low AMH indicates diminished ovarian reserve. Key test in subfertility assessment.

Reference Ranges

Sex Age Range Notes
Female 18–50 yrs See notes Female: follicular 3.5–12.5; mid-cycle surge 4.7–21.5; luteal 1.7–7.7; postmenopausal >25
Female ≥ 50 yrs 25.8 – 134.8 Postmenopausal
Male ≥ 18 yrs 1.5 – 12.4 Adult male

Clinical Interpretation

Low / Decreased
Low FSH — central hypogonadism, hyperprolactinaemia.
High / Increased
Elevated FSH — premature ovarian insufficiency (POI), menopause, primary testicular failure, Klinefelter's, spermatogenic failure.

Related Tests

Oestradiol Prolactin
Specimen
Serum (SST; day 1–3 of cycle for female baseline)
Reporting Unit
IU/L
Category
🔄 Hormones

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.