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FSH & Estradiol Lab Result Interpreter

Just got bloodwork back? Plug in your numbers, age, and last period — see what stage of the menopause transition your labs actually point to, mapped to the STRAW+10 staging system.

Quick answer: The 2012 STRAW+10 staging system reads bloodwork like this: FSH above 25 mIU/mL plus estradiol below 30 pg/mL with no period for 12+ months = postmenopausal. Cycling FSH (sometimes high, sometimes normal) with irregular periods = perimenopause. FSH alone is not enough — it has to be read against your age, your cycle, and how long you have been period-free.

Your labs & cycle

Reproductive years: typically 4-12. Postmenopausal: typically >25-30.
Reproductive (early follicular): 30-150. Postmenopausal: typically <30.
Reflects ovarian reserve. <0.5 ng/mL is consistent with the menopause transition.

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Source & methodology

The thresholds in this tool are taken from the STRAW+10 staging system — the international clinical standard for staging the menopause transition, originally published in 2001 and updated in 2012 (Harlow et al, 2012). FSH > 25 mIU/mL is the postmenopausal cutoff in the +10 update. Estradiol < 30 pg/mL is the standard postmenopausal range. The 12-month-without-period rule is the formal definition of menopause from both the NAMS and the WHO.

  • Harlow SD, Gass M, Hall JE, et al. Executive summary of the Stages of Reproductive Aging Workshop +10: addressing the unfinished agenda of staging reproductive aging. J Clin Endocrinol Metab. 2012;97(4):1159-1168. academic.oup.com
  • NAMS Menopause Guidebook, 9th edition. menopause.org
  • ACOG Practice Bulletin 141: Management of Menopausal Symptoms.

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