Fertility Blood Tests in Australia

What a fertility blood test is

A fertility blood test is a set of hormone measurements, each collected at a specific point in the menstrual cycle, that together describe ovarian reserve, whether ovulation is occurring, and whether any endocrine problem is interfering.

There is no single blood test for fertility, and any product marketed as one is bundling several. What matters is which hormones are measured and when. Reproductive hormones swing by an order of magnitude across a normal cycle, so the same number can be perfectly normal on day 3 and clearly abnormal on day 21.

The panel answers three separate questions. How many eggs are left, approximately — that is AMH, supported by day 2–5 FSH. Is an egg being released each month — that is mid-luteal progesterone. Is something else interfering — that is prolactin, thyroid function, and in some cases androgens where polycystic ovary syndrome is suspected.

It is equally important to be clear about what these tests cannot do. They estimate quantity, not quality. A reassuring AMH in a woman of 41 does not restore the egg quality of 31, and a low AMH in a woman of 29 does not mean she cannot conceive naturally — it mainly predicts how many eggs would be retrieved in an IVF cycle. Australian professional guidance is consistent on this point: AMH should not be used to counsel a woman that she cannot conceive.

FORM measures and explains. Diagnosis, treatment and any assisted-reproduction decision rests with your GP or a fertility specialist.

Which blood tests are included, and what each one answers

Each hormone in a fertility panel answers a different question, and each has its own collection window.

Two additions are worth knowing about even though they are not hormones. A rubella immunity check and iron studies are routinely done before pregnancy, and vitamin D and B12 are commonly included in a pre-conception review. They are not fertility tests as such, but they change what a doctor does next.

Interpreting the main results

Fertility hormones are interpreted as a pattern against age and cycle day, not as individual pass-or-fail numbers.

The commonest reason for a confusing fertility panel is not disease but timing. A progesterone drawn on a fixed 'day 21' in a woman with a 35-day cycle is drawn a week before ovulation and will read low every time. If your cycle is irregular, count backwards from the expected period rather than forwards from day 1, and expect that a second sample may be needed.

The individual fertility tests, explained

Each test in the panel has its own reference guide covering ranges, timing and what moves the result.

Start with the one your question is actually about — most people arrive here wanting either ovarian reserve or confirmation of ovulation.

• AMH test (ovarian reserve) — age-specific ranges, what AMH does and does not predict, and why the pill lowers it.
• Progesterone blood test — the day 21 test that confirms ovulation — and how to time it when your cycle is not 28 days.
• Ovulation test — LH surge tracking and how it compares with a mid-luteal progesterone.
• LH and FSH blood test — the day 2–5 baseline, and what a raised FSH or an altered LH:FSH ratio suggests.
• Oestradiol blood test — required to interpret FSH properly, and central to cycle assessment.
• Prolactin blood test — one of the most treatable causes of anovulation — and the easiest to get falsely high.
• Thyroid function test — TSH and free T4; both underactive and overactive thyroid disrupt ovulation.
• Male fertility test — the other half of a couple's assessment — semen analysis plus reproductive hormones.
• Semen analysis — WHO 6th edition limits and the collection detail that decides whether the result is valid.
• Build your own Australian panel — assemble exactly the hormones your GP or specialist has asked for.
• FORM Australian panels — the standard tiers, and which reproductive hormones each includes.

What affects fertility blood results

Contraception, cycle timing, recent illness, biotin supplements and even the 20 minutes before a prolactin draw can all move these results.

• Hormonal contraception suppresses FSH, LH, oestradiol and progesterone; results on the pill do not reflect your natural cycle. AMH is less affected but still reads lower, and typically recovers within a few months of stopping.
• Irregular or absent cycles make day-based timing unreliable — this is itself a finding worth investigating rather than working around.
• High-dose biotin (often in hair, skin and nail supplements) interferes with many immunoassays, including thyroid and some reproductive hormones. Stop biotin for at least 48–72 hours before testing.
• Prolactin rises with stress, a difficult venepuncture, recent exercise, nipple stimulation and some medicines including antipsychotics, metoclopramide and some antidepressants — a mildly raised prolactin should always be repeated after rest before it is acted on.
• Recent pregnancy, miscarriage or breastfeeding substantially alters the whole panel.
• Ovarian surgery, chemotherapy or pelvic radiotherapy reduce reserve and change interpretation.
• PCOS raises AMH, which can look like excellent reserve while ovulation is in fact infrequent.

Who should consider fertility blood tests

Australian guidance suggests investigation after 12 months of trying, or after six months if you are over 35 — and earlier where cycles are irregular or there is a known risk factor.

• Twelve months of unprotected intercourse without conception (six months if over 35).
• Irregular, absent or very long cycles — investigate without waiting.
• Known or suspected PCOS, endometriosis, or previous pelvic surgery or infection.
• Previous chemotherapy, radiotherapy or ovarian surgery.
• Family history of early menopause.
• Planning to delay pregnancy, or considering egg freezing, and wanting a baseline.
• Recurrent miscarriage — as part of a broader specialist work-up, not in isolation.

How fertility testing works with FORM in Australia

You order the panel, we issue the Australian pathology request form, and you attend an accredited collection centre on the correct cycle day for each hormone.

• 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 of what each number means in context.
• FORM is a diagnostic testing service. We do not prescribe, treat, or provide fertility procedures — take your results to your GP or a fertility specialist.
• Australian ordering is currently pre-sale. Join the waitlist and we will email you when ordering opens.
• Where the panel spans two cycle windows (day 2–5 and mid-luteal), the request form covers both visits so you attend twice in one cycle.
• Morning collection is preferred, particularly for prolactin and for a male partner's testosterone.
• Results typically report within one to three business days for standard hormones.