Your FSH levels can be responsive to what’s happening in your body and your environment. Factors like stress, diet, and certain medications can nudge this hormone level up or down, sometimes enough to affect your cycle or fertility.
Having high FSH levels may suggest menopause or perimenopause, premature ovarian insufficiency (POI), diminished ovarian reserve, ovarian failure, Turner syndrome and pituitary tumors. Factors that can raise FSH levels include stress, alcohol use, smoking, and fertility medications.
Having low FSH levels may suggest pregnancy, hypothalamic or pituitary gland dysfunction, PCOS, and Kallmann syndrome (less common in females). Factors that can lower FSH levels include excessive exercise, calorie restriction, chronic use of gonadotropin-releasing hormone (GnRH) agonists, and birth control pills.
The typical reference ranges for FSH in females depends on where you are in your cycle and whether or not you’re in menopause:
• Follicular phase. 2.5–10.2 mIU/mL.
• Mid-cycle. 3.1–17.7 mIU/mL.
• Luteal phase. 1.5–9.1 mIU/mL.
• Post-menopause. 23.0–116.3 mIU/mL.
The results of an FSH test on cycle day 3 — with day 1 being the first day of your period — often best reflect ovarian reserve, which is a key biomarker for fertility.
You don’t typically need to fast ahead of an FSH test. But you should always check with your provider for special instructions.
Most labs return results in 1–3 business days.
Yes, some at-home kits measure FSH levels and other reproductive biomarkers.
Not necessarily. High FSH may suggest ovarian insufficiency, but providers must interpret results in the context of other symptoms, estradiol levels, and age.
Typically, insurance covers FSH testing if a provider orders it to evaluate infertility, menstrual irregularities, or menopause. Insurance is not required for lab testing through Hers.
