1 in 500

Australians have primary hyperparathyroidism, often diagnosed incidentally

Endocrine Society of Australia 2021

Good reasons to test

Persistently high or low blood calcium
Kidney stones (especially recurrent)
Osteoporosis or unexplained bone loss

Parathyroid Hormone (PTH)

No fasting required. Morning preferred — mild diurnal variation exists; consistent timing aids monitoring Results arrive in 2-3 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.

Standard Care

PTH

The calcium-regulating hormone behind bone and kidney health

$59one-off, no subscription

NATA-accredited pathology
No GP referral needed
Results in 2-3 business days
Collect at 1,900+ centres

Why this test

PTH and calcium work together — you need both results to understand what's driving any imbalance.

Parathyroid hormone (PTH) is produced by four small glands behind the thyroid and is the primary regulator of blood calcium. Elevated PTH may indicate hyperparathyroidism — the most common cause of persistent high calcium — or be a compensatory response to low vitamin D or kidney disease. PTH is almost always interpreted alongside calcium and vitamin D.

Understanding your results

Within reference range

Your PTH is within the expected range — interpretation is most meaningful alongside calcium and vitamin D results

Low-normal

Within reference range — interpretation alongside calcium and vitamin D is important

Below reference range

Low PTH alongside elevated calcium may suggest a non-parathyroid cause of high calcium — discuss with your healthcare practitioner

Above reference range

Elevated PTH may reflect hyperparathyroidism, vitamin D deficiency, or kidney disease — 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 PTH test online from Clarity Labs without a GP referral. It's $59, collected at any of 1,900+ NATA-accredited centres across Australia, with results in 2-3 business days via your secure online dashboard.

A PTH test is $59 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.

PTH and calcium must be interpreted together. High PTH with high calcium points to primary hyperparathyroidism; high PTH with low calcium typically indicates a compensatory response (e.g., vitamin D deficiency). Neither result is fully interpretable in isolation.

Fasting is not strictly required, but morning testing on an empty stomach is preferable for consistency and to minimise the effect of recent meals on calcium levels.

Annually if monitoring a known parathyroid or kidney condition. Otherwise, PTH is typically tested when calcium is found to be persistently abnormal — it's not a routine standalone test.

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

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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.