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Australians may not meet recommended magnesium intake through diet
Australian Health Survey, ABS 2011-13
Good reasons to test
  • Muscle cramps, twitching, or spasms
  • Sleep difficulties or restless legs
  • Fatigue or low energy despite adequate sleep

No fasting required. Any time of day Results arrive in 3 to 5 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

Magnesium

The mineral behind energy, sleep, and muscle recovery

$49one-off, no subscription
  • NATA-accredited pathology
  • No GP referral needed
  • Results in 3 to 5 business days
  • Collect at 1,900+ centres

Why this test

Magnesium is a cofactor in over 300 enzyme reactions — yet blood testing frequently returns 'normal' even in people who are functionally depleted.

Magnesium is essential for energy production, muscle function, sleep quality, nerve transmission, and blood sugar regulation. Blood magnesium is tightly maintained — the body pulls from bones and muscle stores to keep serum levels stable, meaning a low serum result often indicates significant depletion. Common causes of low magnesium include high alcohol intake, gastrointestinal conditions, prolonged stress, intense exercise, and certain medications (diuretics, PPIs).

Understanding your results

Within reference range

Your magnesium level is within the expected range

Low-normal

Within range but on the lower side — dietary or supplemental magnesium may be worth discussing

Below reference range

Low serum magnesium may indicate significant depletion — discuss with your healthcare practitioner

Above reference range

High magnesium is rare without supplementation — 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

1
TODAY
Order online

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

2
THIS WEEK
One quick visit

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

3
IN 3 TO 5 BUSINESS DAYS
Clear results

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

4
ONGOING
Track over time

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

Yes. You can order the Magnesium test online from Clarity Labs without a GP referral. It's $49, collected at any of 1,900+ NATA-accredited centres across Australia, with results in 3 to 5 business days via your secure online dashboard.

The Magnesium test is $49 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.

Serum magnesium reflects only about 1% of total body magnesium — the rest is stored in bones and cells. The body maintains serum levels at the expense of tissue stores, so a 'normal' blood test doesn't rule out functional deficiency.

A single meal is unlikely to meaningfully alter the result. However, long-term dietary patterns, alcohol intake, and gastrointestinal health significantly influence magnesium status.

Every 6-12 months if symptoms persist or you have a condition that depletes magnesium (e.g., Crohn's disease, high alcohol intake, long-term diuretic use). Otherwise, annually alongside a broader mineral check.

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.

$49