LH and FSH Blood Test in Australia
LH and FSH are the two gonadotrophins released by the pituitary to drive the ovaries and testes, reported in IU/L — and measuring them alongside testosterone or oestradiol is what separates a problem in the gonad itself from a problem in the pituitary above it.
What this test measures
Serum luteinising hormone (LH) and follicle-stimulating hormone (FSH), reported in IU/L.
- LH and FSH are almost never useful alone — their value is in the pattern with testosterone or oestradiol.
- High gonadotrophins with a low sex hormone points to the gonad; low or normal gonadotrophins point to the pituitary.
- In women, day 2–5 collection is standard; LH is also tracked mid-cycle for the ovulatory surge.
- In men, morning collection alongside testosterone is standard.
- No GP referral needed — you order directly and we issue the Australian pathology request form.
FORM Australia is in pre-sale — join the waitlist for lh and fsh blood test.
We're onboarding Australian customers in batches while we finalise our accredited-lab partnership. Join the waitlist and we'll email you as soon as ordering opens. Prices shown across the Australian site are indicative and final at launch.
What LH and FSH are
LH and FSH are glycoprotein hormones released in pulses by the anterior pituitary under the direction of hypothalamic GnRH; they are the instructions the brain sends to the ovaries and testes.
In men, LH acts on Leydig cells to produce testosterone, and FSH acts on Sertoli cells to support sperm production. In women, FSH recruits and matures ovarian follicles, and a sharp mid-cycle LH surge triggers ovulation and the formation of the corpus luteum. Both operate in a negative feedback loop: when sex hormone output is adequate, the pituitary eases off; when it is not, the pituitary pushes harder.
That feedback loop is the entire diagnostic logic of the test. It converts a single ambiguous number — a low testosterone, say — into a location. If testosterone is low and LH is high, the pituitary is shouting and the testis is not answering: the problem is in the testis (primary hypogonadism). If testosterone is low and LH is low or unremarkably normal, the pituitary is not shouting when it should be: the problem is at the pituitary or hypothalamus (secondary hypogonadism).
The same logic applies in women. A high FSH with a low oestradiol says the ovaries are no longer responding, which is the biochemistry of menopause and of premature ovarian insufficiency. A low FSH and LH with a low oestradiol says the drive itself has been switched off — commonly by low energy availability, heavy training, significant weight loss, or hyperprolactinaemia.
Because both hormones are released in pulses roughly every 60 to 90 minutes, individual values bounce. Interpretation looks at the pattern and the company they keep, not at a single decimal place.
Australian reference ranges
LH and FSH are reported in IU/L and interpreted against sex, cycle phase, menopausal status and pubertal stage.
| Group or phase | LH (IU/L) | FSH (IU/L) | Notes |
|---|---|---|---|
| Adult male | 1.5–9.3 | 1.4–18.1 | Collected 7–10am with testosterone |
| Female, follicular (day 2–5) | 2–13 | 3–10 | The standard baseline; read with oestradiol |
| Female, mid-cycle surge | 20–100 | 5–20 | The LH surge precedes ovulation by 24–36 hours |
| Female, luteal phase | 1–13 | 1.5–8 | Both fall after ovulation |
| Post-menopausal | 15–60 | > 25 (often 30–120) | Loss of ovarian feedback raises both |
| Pre-pubertal | < 1 | < 3 | Rises with pubertal onset |
How to read LH and FSH with the sex hormone
The combination of gonadotrophin level and sex hormone level localises the problem to the gonad, the pituitary, or neither.
One pattern comes up repeatedly and is worth naming. A man with low testosterone and low LH and FSH who has previously used testosterone, anabolic steroids or SARMs is showing suppression of the axis by that exposure — sometimes long after stopping. Recovery varies from months to years and occasionally does not complete. This is a specialist conversation, and it is another reason a full history matters as much as the numbers.
| Sex hormone | LH / FSH | Usual interpretation |
|---|---|---|
| Testosterone low (men) | High | Primary hypogonadism — testicular; includes Klinefelter syndrome, prior orchitis, chemotherapy, trauma |
| Testosterone low (men) | Low or inappropriately normal | Secondary hypogonadism — pituitary or hypothalamic; includes prior testosterone or anabolic steroid use, obesity, opioids, hyperprolactinaemia |
| Testosterone normal (men) | FSH raised, LH normal | Selective impairment of spermatogenesis; relevant in fertility assessment |
| Oestradiol low (women) | FSH high (> 25 IU/L) | Menopause if age-appropriate; premature ovarian insufficiency if under 40 |
| Oestradiol low (women) | LH and FSH low | Functional hypothalamic suppression, hyperprolactinaemia, or pituitary disease |
| Oestradiol normal (women) | LH raised relative to FSH | Can support a PCOS picture alongside clinical and ultrasound criteria |
| Testosterone raised (women) | LH raised, FSH normal | Assessed within a hyperandrogenism work-up with SHBG, DHEAS and 17-OHP |
Which panel includes LH and FSH
The gonadotrophins sit at the centre of both the male hormone panel and the female cycle panel.
- Testosterone test — the male sex hormone the gonadotrophins are read against.
- Oestradiol blood test — required with day 2–5 FSH — a high oestradiol can mask a raised FSH.
- Prolactin blood test — essential whenever both LH and FSH are unexpectedly low.
- AMH test — a steadier ovarian reserve marker than FSH, and less cycle-dependent.
- Male fertility test — LH and FSH alongside a semen analysis localise the cause of a low count.
- Fertility blood tests — overview — how the day 2–5 pair fits into a full fertility assessment.
- Build your own Australian panel — combine LH, FSH, testosterone, oestradiol and prolactin in one collection.
- FORM Australian panels — LH and FSH are included from the Pro tier upward.
What affects LH and FSH results
Pulsatility, cycle timing, contraception, exogenous hormones and biotin all move these results.
- Pulsatile secretion every 60 to 90 minutes — two samples an hour apart can differ noticeably, especially for LH.
- Cycle day in women — a day 12 sample can catch the surge and look dramatically abnormal out of context.
- Hormonal contraception suppresses both LH and FSH; results on the pill do not reflect your own axis.
- Exogenous testosterone, anabolic steroids or SARMs suppress LH and FSH, often profoundly.
- Opioids and glucocorticoids suppress the axis; obesity lowers LH-driven testosterone through several mechanisms.
- Hyperprolactinaemia suppresses GnRH and therefore both gonadotrophins — check prolactin whenever both are low.
- Acute illness, major stress, low energy availability and heavy training load all suppress the axis.
- High-dose biotin supplements interfere with immunoassays — stop 48–72 hours before testing.
Who should consider LH and FSH testing
Gonadotrophins are ordered whenever a low or ambiguous sex hormone needs explaining, and in the assessment of menopause, puberty and fertility.
- Men with a confirmed low morning testosterone — LH and FSH are the next step, not an optional extra.
- Men investigating fertility, alongside a semen analysis.
- Women with irregular, absent or changing cycles.
- Suspected menopause under 45, or suspected premature ovarian insufficiency under 40.
- Fertility assessment — day 2–5 FSH with oestradiol is a standard component.
- Suspected polycystic ovary syndrome, as part of the broader assessment rather than alone.
- Delayed or early puberty in adolescents, under paediatric or endocrine direction.
- Any history of testosterone, anabolic steroid or SARM use, where axis suppression is the question.
How LH and FSH testing works with FORM in Australia
You order the pair, we issue an Australian pathology request form, and you attend an accredited collection centre at the right time of day or cycle.
- No referral from your own GP is required. Privately requested pathology is arranged under a request from a registered medical practitioner working with our accredited lab partner.
- Collection is a walk-in at Laverty (Healius) pathology centres Australia-wide (NATA / ISO 15189 accredited).
- Results are returned in Australian SI units with a written, plain-English explanation.
- FORM is a diagnostic testing service. We do not prescribe or supply medicines — take your results to your GP or a specialist.
- Australian ordering is currently pre-sale. Join the waitlist and we will email you when ordering opens.
- LH and FSH are measured on the same sample, and we include the relevant sex hormone by default because the pair is uninterpretable without it.
- Men: collect between 7am and 10am. Women with cycles: collect day 2–5 unless a mid-cycle surge is being tracked.
- Results typically report within one to three business days in IU/L.
Frequently asked questions
- What is a normal LH and FSH level in Australia?
- Indicatively, adult men have LH around 1.5–9.3 IU/L and FSH 1.4–18.1 IU/L. In women during the follicular phase, LH is about 2–13 IU/L and FSH 3–10 IU/L, with a mid-cycle LH surge of 20–100 IU/L. After menopause FSH is typically above 25 IU/L. Your report's own interval applies.
- What does a high FSH mean?
- In a woman it usually indicates reduced ovarian response — menopause if age-appropriate, and premature ovarian insufficiency if under 40. In a man a raised FSH with a low sperm count suggests impaired spermatogenesis within the testis. Both need interpretation alongside the sex hormone level.
- What does a low LH with low testosterone mean?
- It suggests secondary hypogonadism — the signal from the pituitary or hypothalamus is inadequate rather than the testis failing. Common contributors include previous testosterone or anabolic steroid use, obesity, opioids and raised prolactin. It needs medical assessment.
- When should LH and FSH be tested in the cycle?
- Day 2 to 5 for the baseline, counting the first day of full flow as day 1. Mid-cycle testing is done only when the LH surge is specifically being tracked, because a surge sample looks abnormal against follicular ranges.
- Do I need to fast for an LH and FSH test?
- No. Fasting is not required. Men should collect between 7am and 10am so that testosterone measured on the same sample is interpretable.
- Can I test LH and FSH while on the pill?
- You can, but hormonal contraception suppresses both, so the result reflects the medication and not your own reproductive axis.
- Why are LH and FSH tested together?
- They are released by the same pituitary cells under the same GnRH drive, and the relationship between them carries information — a raised LH relative to FSH can support a PCOS picture, while a raised FSH with a normal LH points to impaired spermatogenesis or reduced ovarian reserve.
- How much does an LH and FSH blood test cost in Australia?
- FORM's indicative price is A$99 for the pair with the relevant sex hormone included. Australian ordering is pre-sale and prices are final at launch. Medicare rebates depend on the requesting doctor's clinical indications, so a self-requested test is usually paid in full.
- Will LH and FSH recover after stopping testosterone?
- Often, but not always, and the timeframe ranges from months to years. Recovery depends on duration of use, dose and individual factors. This should be managed with an endocrinologist rather than self-directed — and never stop a prescribed medicine to change a test result.
References
- [1]RCPA Manual — pathology test reference intervalsRoyal College of Pathologists of Australasia
- [2]Lab Tests Online AU — patient test informationAustralasian Association for Clinical Biochemistry and Laboratory Medicine
- [3]Position statement on male hypogonadism and testosterone measurementEndocrine Society of Australia
FORM Australia is in pre-sale — join the waitlist for lh and fsh blood test.
We're onboarding Australian customers in batches while we finalise our accredited-lab partnership. Join the waitlist and we'll email you as soon as ordering opens. Prices shown across the Australian site are indicative and final at launch.
Other Australian tests
This page is general information about pathology testing, not medical advice, and does not replace consultation with a registered health practitioner. Discuss any result with your GP or a registered doctor. FORM provides diagnostic testing and interpretation only — we do not diagnose, prescribe medicines or provide treatment.