1 in 4

women with irregular cycles have inadequate luteal phase progesterone

Prior et al., Climacteric 2018

Good reasons to test

Confirming ovulation as part of fertility investigation
Irregular, short, or absent menstrual cycles
Recurrent early pregnancy loss

Progesterone

No fasting required. Day 21 of a 28-day cycle (or 7 days before expected next period) — mid-luteal phase timing is critical for meaningful results Results arrive in 1-2 business days, explained in plain language in your dashboard. Most results sit within the usual range - that is still useful, and anything unexpected supports a conversation with your healthcare practitioner.

Targeted Testing

Progesterone

The luteal phase hormone — key to cycle health and fertility

$65one-off, no subscription

NATA-accredited pathology
No GP referral needed
Results in 1-2 business days
Collect at 1,900+ centres

Why this test

Progesterone confirms that ovulation has occurred and supports the uterine lining for early pregnancy.

Progesterone is produced by the corpus luteum after ovulation and rises sharply during the luteal phase (days 21–28 of a typical 28-day cycle). A low mid-luteal progesterone result may indicate that ovulation did not occur (anovulation) or that the luteal phase is inadequate — a common but underdiagnosed cause of cycle irregularity and fertility challenges.

Understanding your results

Consistent with ovulation

A mid-luteal result above 16 nmol/L is generally consistent with ovulation having occurred

Low-normal

May indicate ovulation occurred but luteal phase may be suboptimal — discuss with your healthcare practitioner

Below ovulation threshold

A mid-luteal progesterone below 5 nmol/L may suggest ovulation did not occur — discuss with your healthcare practitioner

Elevated

Very high progesterone outside pregnancy may warrant discussion — discuss with your healthcare practitioner

Reference ranges vary by laboratory and personal context. Your result is shown against the lab's range in your dashboard, alongside what it means.

How it works

TODAY

Order online

Pick a test or panel and check out. No GP referral, no waiting room.

THIS WEEK

One quick visit

Walk into one of 1,900+ NATA-accredited collection centres. A single blood draw is all it takes.

IN 2–5 DAYS

Clear results

We translate your results into plain language in your dashboard - what each marker means, and what is in range.

ONGOING

Track over time

Retest when it matters and watch your trends, so you can see what is actually changing.

Yes. You can order a Progesterone test online from Clarity Labs without a GP referral. It's $65, collected at any of 1,900+ NATA-accredited centres across Australia, with results in 1-2 business days via your secure online dashboard.

A Progesterone test is $65 at Clarity Labs — a one-off price with no subscription or membership. That covers your pathology request form and collection at any of 1,900+ NATA-accredited centres nationwide.

Progesterone is only elevated after ovulation, during the luteal phase. Testing at the wrong time — particularly in the follicular phase — will give a low result even in people who ovulate normally. Day 21 of a 28-day cycle is the standard mid-luteal timing.

Testing should be timed to approximately 7 days before your next expected period, not necessarily day 21. Your healthcare practitioner can advise on the best timing for your cycle pattern.

No fasting is required.

During active fertility investigation, monthly mid-luteal testing (around day 21) confirms ovulation across cycles. Once confirmed, repeat testing is only needed if symptoms change.

NATA-accredited pathologyCollected through Sonic Healthcare1,900+ collection centresNo GP referral needed

Complete your health picture

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Luteinising hormone measurement for reproductive hormone assessment.

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FSH

Follicle-stimulating hormone measurement for reproductive hormone assessment.

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This information is for general education and is not medical advice, diagnosis, or treatment. Results are best interpreted with a qualified healthcare practitioner in the context of your symptoms and history.