25–40%

of anovulatory cycles involve LH dysregulation as a contributing factor

Balen et al., Human Reproduction 2003

Good reasons to test

Investigating irregular or absent periods
Fertility assessment or planning
Suspected polycystic ovary syndrome (PCOS)

Luteinizing Hormone (LH)

No fasting required. Day 2–5 of menstrual cycle for baseline fertility assessment; day 21 for luteal phase; morning preferred 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

LH

The hormone that triggers ovulation — and reveals the reproductive axis

$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

LH is the hormone that triggers ovulation in women and testosterone production in men.

Luteinising hormone (LH) is released by the pituitary gland and plays a central role in the reproductive axis. In women, an LH surge triggers ovulation — monitoring LH can help understand cycle regularity and fertility status. In men, LH stimulates the testes to produce testosterone. Abnormal LH levels may point to pituitary, hypothalamic, or gonadal dysfunction.

Understanding your results

Within reference range

Interpretation is cycle-phase and sex-dependent — your healthcare practitioner can advise on context

Low-normal

Within range — interpretation varies with cycle phase and sex

Below reference range

Low LH may suggest pituitary or hypothalamic involvement — discuss with your healthcare practitioner

Elevated

Elevated LH may reflect menopause, PCOS, or primary gonadal insufficiency — 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 LH 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 LH 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.

For a baseline fertility assessment, day 2–5 of your cycle (counting from the first day of your period) is standard. Your healthcare practitioner may request testing at other cycle points depending on what they are investigating.

Yes. In men, LH stimulates testosterone production. Low LH alongside low testosterone may suggest a central (pituitary) cause of low testosterone, which is important for treatment decisions.

No fasting is required.

For fertility investigation, your healthcare practitioner will advise on timing within your cycle — frequency matters less than the right cycle day. For ongoing hormone monitoring, annually or as directed.

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

Complete your health picture

Tests and panels that pair well with this one.

SHBG

Sex hormone binding globulin measurement for hormone transport and bioavailability assessment.

$65

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Oestradiol

Oestradiol measurement for reproductive hormone assessment and cycle context.

$65

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Progesterone

Progesterone measurement for reproductive hormone assessment and ovulation confirmation.

$65

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FSH

Follicle-stimulating hormone measurement for reproductive hormone assessment.

$65

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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.