30%

decline in IGF-1 levels between ages 30 and 60

Rosen et al., JCEM 2003

Good reasons to test

Unexplained fatigue, reduced muscle mass, or increased body fat
Suspected adult growth hormone deficiency
Monitoring growth hormone replacement therapy

IGF-1 (Insulin-like Growth Factor 1)

No fasting required. Any time of day — IGF-1 is more stable than GH and not significantly affected by fasting or time of day Results arrive in 3-5 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.

Targeted Testing

IGF 1

A proxy for growth hormone — and a window into metabolic ageing

$49one-off, no subscription

NATA-accredited pathology
No GP referral needed
Results in 3-5 business days
Collect at 1,900+ centres

Why this test

IGF-1 is more stable than growth hormone itself — making it the preferred marker for assessing the GH axis.

Insulin-like growth factor 1 (IGF-1) is produced mainly in the liver in response to growth hormone (GH) stimulation. Because GH is released in pulses, a single GH measurement is unreliable — IGF-1 reflects integrated GH activity over time. IGF-1 declines with age and is influenced by nutritional status, liver function, and body composition. It is used in the investigation of growth hormone deficiency in adults, and in some longevity and metabolic health contexts.

Understanding your results

Within reference range

IGF-1 reference ranges vary substantially by age — your full report includes age-appropriate context

Low-normal

Within range but on the lower side — interpretation is age-dependent

Below reference range

Low IGF-1 may suggest growth hormone deficiency or suboptimal nutritional status — discuss with your healthcare practitioner

Above reference range

Elevated IGF-1 may warrant investigation — 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 IGF 1 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 3-5 business days via your secure online dashboard.

A IGF 1 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.

Growth hormone is released in pulses and fluctuates dramatically throughout the day. A single GH measurement is unreliable — IGF-1 reflects integrated GH activity and is much more stable and clinically useful.

There is ongoing research into IGF-1 and ageing. Some studies link chronically high IGF-1 to increased cancer risk; others associate low levels with frailty and sarcopenia. The relationship is complex and best interpreted with your healthcare practitioner in context.

No fasting is required for IGF-1.

Annually for longevity or metabolic tracking. If monitoring growth hormone therapy, as directed by your healthcare practitioner — typically every 3-6 months until a stable dose is reached.

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.