FSH Blood Test: Normal Range, What High & Low Levels Mean (2026)
The FSH blood test measures follicle-stimulating hormone — a key marker for fertility, menopause and reproductive health in both women and men. Here’s what the test shows, how to read your results, the normal range by age and cycle, and how to get tested privately.
Short answer
An FSH blood test measures the level of follicle-stimulating hormone in your blood. In women it’s used to assess fertility, ovarian reserve and menopause; in men it helps evaluate sperm production. For women of reproductive age a typical normal range is roughly 4.7–21.5 IU/L, measured on day 2–4 of your cycle; consistently raised levels (often above ~30 IU/L) can point towards perimenopause or menopause. Privately, an FSH test costs from around £19 for a single marker up to £69–£149 for a full female hormone or fertility panel. Ranges vary by lab — always read your result against your own report’s reference range and discuss it with a clinician.
On this page
If you’ve had bloods taken and seen “FSH” on the report, or you’re trying to understand your fertility or menopause status, this guide explains exactly what the number means. FSH is one of the most common hormone markers ordered, and it’s one of the most misread — because “normal” depends heavily on your age, your sex, and where you are in your menstrual cycle.
What is an FSH blood test?
FSH stands for follicle-stimulating hormone. It’s produced by the pituitary gland at the base of the brain, and it does exactly what its name suggests: in women it stimulates the ovarian follicles that contain eggs to grow and mature each cycle; in men it drives sperm production in the testes. The FSH blood test simply measures how much of this hormone is circulating, usually reported in IU/L (international units per litre) or the equivalent mIU/mL.
Because FSH sits at the top of the reproductive hormone chain, its level tells doctors a lot about how well the ovaries or testes are responding. It’s rarely interpreted alone — it’s usually read alongside LH, oestradiol and (for ovarian reserve) the AMH test.
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Why an FSH test is done
- Menopause and perimenopause — if periods become irregular or stop, a raised FSH can support (though not alone confirm) a menopause diagnosis.
- Female fertility — to assess ovarian reserve and how the ovaries are responding, often before fertility treatment.
- Male fertility — to help investigate low sperm count or testicular function.
- Irregular or absent periods — to help find the cause.
- Pituitary problems — unusually high or low FSH can flag a pituitary gland issue.
- Early or delayed puberty in children.
Normal FSH range by age and cycle
This is the part people most want, so here it is — but read the caveat underneath, because it genuinely matters. Reference ranges differ between laboratories, so these are typical guide figures (in IU/L, equivalent to mIU/mL):
| Group / stage | Typical FSH range (IU/L) |
|---|---|
| Women — follicular phase (day 2–4) | ~3.4–21.6 |
| Women — reproductive years (general) | ~4.7–21.5 |
| Women — ovulation peak | ~5.0–20.8 |
| Women — after menopause | ~25.8–134.8 |
| Men (adult) | ~1.4–13.8 |
| Children (pre-puberty) | up to ~2.5 |
What do high FSH levels mean?
Higher-than-normal FSH usually means the pituitary is working harder to stimulate ovaries or testes that are responding less well. In practice that most often points to:
- Reduced ovarian reserve — fewer eggs remaining, which becomes more common with age.
- Perimenopause or menopause — FSH rises as the ovaries wind down. Levels consistently above ~30 IU/L, with menopausal symptoms, support a diagnosis — but a single high reading isn’t enough, as levels fluctuate, especially in perimenopause.
- Primary ovarian insufficiency (POI) — when ovaries stop working normally before 40.
- In men — high FSH can indicate the testes aren’t producing sperm properly.
- Certain genetic conditions (e.g. Turner or Klinefelter syndrome) and some pituitary tumours.
What do low FSH levels mean?
Low FSH is less commonly flagged but can indicate that the pituitary or hypothalamus isn’t signalling properly. Possible causes include problems with the pituitary gland, very low body weight or excessive exercise, high stress, certain medications, or some hormonal conditions. In women it can be linked to irregular or absent periods. As with high readings, low FSH is interpreted in context, not on its own.
FSH and LH together
FSH is very often tested at the same time as LH (luteinising hormone), because the two work as a pair and the ratio between them is informative. For example, an LH that’s high relative to FSH can be associated with PCOS, while both being elevated points toward ovarian or testicular under-function. This is why most fertility and menopause panels include both, plus oestradiol, rather than FSH alone.
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Compare ProvidersFSH testing in men
FSH isn’t only a women’s test. In men, FSH stimulates sperm production, so it’s a useful part of a male fertility work-up — typically alongside LH, testosterone and a semen analysis. A raised FSH in a man can suggest the testes aren’t functioning as they should, while a low FSH may point to a pituitary cause. Many private male hormone panels include FSH, LH, testosterone, SHBG, oestradiol and prolactin together.
When should you take an FSH test?
Timing is critical for women and the single most common reason results get misread:
- Women: take the test on day 2, 3 or 4 of your menstrual cycle (day 1 is the first day of your period). This “early follicular” reading is the standard baseline for fertility and ovarian reserve.
- Menopause testing: if you’re not having periods, it can be taken at any time, but levels fluctuate in perimenopause so a repeat test may be advised.
- Avoid if on hormonal contraception or HRT — these affect FSH and make the result unreliable. Discuss timing with your provider.
- Men: no cycle timing, though morning samples are preferred when testosterone is tested too.
Private FSH test cost in the UK (2026)
FSH is an inexpensive marker, so the price mostly depends on whether you buy it alone or as part of a hormone panel (which is usually better value and more clinically useful). Indicative 2026 prices:
| Option | Typical price (2026) |
|---|---|
| Single hormone marker (home finger-prick) | ~£19–£39 |
| Female hormone / fertility panel (FSH, LH, oestradiol, etc.) | ~£69–£149 |
| Male hormone panel (incl. FSH, LH, testosterone) | ~£59–£129 |
| Clinic venous draw add-on | +~£25–£59 |
| Private fertility clinic / consultant assessment | £100+ (often bundled) |
Providers such as Medichecks, Thriva, Forth and Randox offer FSH within hormone panels; prices vary and discount codes are common. Always confirm the current price and exactly which markers are included on the provider’s own site. For the wider picture see our guides to private hormone blood tests and private blood tests in London.
Home test kit vs clinic
- Home finger-prick kits are the cheapest and most convenient — order online, take a small sample, post it to an accredited lab, get results to your phone in a few days. Good for FSH, but timing-on-cycle is on you.
- Venous blood draw (at a clinic or via a home phlebotomist) is the clinical gold standard for accuracy and is preferred for some hormones. It costs a little more.
- Fertility clinic gives you a specialist to interpret the result alongside an AMH test, ultrasound and your history — the most thorough route if you’re actively planning fertility treatment.
Does health insurance cover FSH testing?
Usually not when it’s for fertility. Most UK private health insurance policies exclude fertility investigations and treatment — it’s one of the most common exclusions. However, an FSH test ordered as part of investigating another covered medical condition (for example a suspected pituitary problem) may be covered if you’re referred by a specialist. Cover also won’t apply to pre-existing conditions.
The honest takeaway: don’t buy insurance expecting it to fund fertility testing. But if you want fast access to scans, specialists and treatment for the many conditions that are covered, comparing policies is worthwhile — see what insurance covers for diagnostics.
The bottom line
The FSH blood test is a simple, low-cost window into reproductive health — but the number only means something in context. For women, test on day 2–4 of your cycle and read the result against your lab’s range and your age; consistently high FSH can signal declining ovarian reserve or menopause, while in men it helps assess sperm production. Privately it’s cheap and easy to arrange, from around £19 as a single marker or £69+ within a fuller hormone panel. Whatever the result, have a clinician interpret it alongside LH, oestradiol, AMH and your symptoms — FSH alone rarely tells the whole story.
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FSH blood test FAQs
What is a normal FSH level?
For women of reproductive age, roughly 4.7–21.5 IU/L is typical (around 3.4–21.6 in the early follicular phase, days 2–4). After menopause it’s much higher (~25.8–134.8 IU/L). For adult men it’s about 1.4–13.8 IU/L. Ranges vary by lab, so always check your own report’s reference range.
What does a high FSH level mean?
High FSH usually means the ovaries or testes are responding less well, so the pituitary produces more to compensate. In women it often signals reduced ovarian reserve or perimenopause/menopause (consistently above ~30 IU/L with symptoms). In men it can mean impaired sperm production. A single high reading isn’t conclusive, as levels fluctuate.
When is the best time to take the test?
For women, on day 2–4 of the menstrual cycle (day 1 is the first day of your period) for an accurate baseline. Avoid testing while on hormonal contraception or HRT, as these affect the result. For menopause testing without periods, it can be taken any time but may need repeating.
Can men take an FSH test?
Yes. FSH stimulates sperm production, so it’s part of a male fertility assessment, usually alongside LH, testosterone and a semen analysis. Raised FSH in a man can indicate the testes aren’t functioning properly.
What FSH level indicates menopause?
Levels consistently above around 30 IU/L, alongside menopausal symptoms and changes to your periods, support a menopause diagnosis. But because FSH fluctuates in perimenopause, doctors look at symptoms and menstrual history too — a single number doesn’t confirm it. Menopause is formally confirmed after 12 months without a period.
How accurate is the FSH test?
The lab measurement itself is reliable, but FSH on its own is a limited picture because levels swing through the cycle and over time. It’s most accurate and useful when timed correctly (day 2–4 for women) and interpreted alongside LH, oestradiol, AMH and an ultrasound where relevant.
How much does a private FSH test cost?
From around £19–£39 as a single home finger-prick marker, or £69–£149 within a female hormone/fertility panel (£59–£129 for a male panel). A venous draw adds roughly £25–£59, and a fertility-clinic assessment with a specialist costs more but includes interpretation. Confirm current prices with the provider.
Does insurance cover an FSH or fertility test?
Usually not for fertility — fertility investigation and treatment is a standard exclusion on most UK policies. An FSH test may be covered if it’s part of investigating a different, covered condition on specialist referral, but not for pre-existing conditions.
Disclaimer: Going Private UK is an independent information website. We are not a clinic, laboratory or insurer, and we are not affiliated with, endorsed by or paid by any provider mentioned. FSH reference ranges vary between laboratories and the figures here are general 2026 guide values, not a diagnosis — always read your result against your own report and have it interpreted by a qualified clinician. Prices are indicative and change; confirm current costs with the provider. This content is for general information only and is not medical advice. Always consult a GP, fertility specialist or other qualified healthcare professional about your symptoms, results and treatment.
