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Health Hub: Biomarker Guides & Articles

Evidence-based guides on hormones, heart health, metabolic testing, nutrition, and longevity — written by our clinical team so you can understand what your results actually mean.

Clinically reviewed | Free to read | 12 guides
Testosterone levels guide
Hormones

Understanding Your Testosterone Levels

Testosterone drives energy, muscle mass, libido, and mood — yet most men don't know their numbers. Learn what the reference ranges mean and when low-normal still causes real symptoms.

6 min read Read Article →
Cholesterol numbers explained
Heart Health

What Your Cholesterol Numbers Really Mean

LDL, HDL, triglycerides — your lipid panel is more nuanced than "good" vs "bad." This guide breaks down each number and what it reveals about your cardiovascular risk.

7 min read Read Article →
Cortisol and belly fat connection
Metabolic

The Link Between Cortisol and Belly Fat

Chronic stress doesn't just feel bad — it literally reshapes your body. Elevated cortisol drives visceral fat accumulation and stalls fat loss even with a calorie deficit.

6 min read Read Article →
Iron deficiency symptoms and causes
Nutrition

Iron Deficiency: The Silent Energy Thief

Fatigue, brain fog, brittle nails — iron deficiency is the world's most common nutritional deficiency, yet it's routinely missed until it progresses to full anaemia.

5 min read Read Article →
VO2 max fitness age explained
Performance

VO2 Max Explained: Your Fitness Age

VO2 max is the single strongest predictor of longevity — more powerful than most clinical risk factors. Find out what yours says about your fitness age and how to improve it.

5 min read Read Article →
Thyroid health TSH T3 T4
Hormones

Thyroid Health: Why It Affects Everything

Weight gain, fatigue, hair loss, brain fog — thyroid dysfunction mimics dozens of conditions. Understanding TSH, T3, and T4 is the first step to getting an accurate diagnosis.

6 min read Read Article →
Gut microbiome and immune system
Gut Health

Gut Microbiome and Your Immune System

Over 70% of your immune system lives in your gut. The trillions of bacteria in your microbiome dictate how well you fight infection, manage inflammation, and stay healthy.

7 min read Read Article →
Vitamin D sunshine hormone deficiency
Nutrition

Vitamin D: The Sunshine Hormone You're Missing

1 in 4 Australians is vitamin D deficient despite year-round sun. It's a hormone, not a vitamin — and its effects span immunity, mood, bone density, and cardiovascular health.

4 min read Read Article →
How sleep affects biomarkers
Longevity

How Sleep Affects Your Biomarkers

One week of poor sleep measurably changes testosterone, cortisol, insulin sensitivity, and inflammatory markers. Your blood results reflect how you sleep — here's the evidence.

5 min read Read Article →
Biological age vs chronological age
Longevity

Biological Age vs Chronological Age

Your birth year is fixed — your biological age isn't. Biomarker panels can reveal whether your body is ageing faster or slower than the calendar, and what to do about it.

6 min read Read Article →
Blood sugar regulation beyond diabetes
Metabolic

Blood Sugar Regulation Beyond Diabetes

You don't need a diabetes diagnosis for unstable blood sugar to wreck your energy, mood, and body composition. HbA1c and fasting glucose reveal the full metabolic picture.

7 min read Read Article →
Heart rate variability science
Heart Health

The Science of Heart Rate Variability

HRV is the gap between your heartbeats — and it's one of the most sensitive indicators of stress, recovery, and cardiovascular health available without a clinical test.

6 min read Read Article →

Ready to know your actual numbers?

Reading about biomarkers is step one. Step two is testing yours. Get doctor-reviewed results in 2–5 business days — no GP referral required.

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Frequently Asked Questions About Health Testing

What biomarkers should I test first?

A comprehensive metabolic panel is the best starting point — it covers glucose, lipids, liver and kidney function, and key electrolytes. Add a hormone panel (testosterone or thyroid) if you have specific symptoms. Our test bundles are designed around common health goals.

How often should I test my biomarkers?

For healthy adults, once or twice a year provides a useful baseline and allows you to track trends. If you're actively managing a health condition, optimising performance, or making significant lifestyle changes, quarterly testing gives you faster feedback and more precise data.

Do I need a GP referral to get blood tests?

No. Optima Stasis allows you to order your tests directly — no referral required. Once you book, you visit one of our collection centres, and a qualified practitioner reviews your results before they're sent to you.

What's the difference between a normal result and an optimal result?

Lab reference ranges are based on population averages — which include people with suboptimal health. "Normal" means you're in the middle of the bell curve; it doesn't mean you're performing at your best. Optimal ranges are narrower and are associated with the lowest disease risk and best functional outcomes.

Are the articles on this page clinically reviewed?

Yes. All Health Hub content is written and reviewed by practitioners with clinical backgrounds in pathology, sports medicine, and functional health. We cite peer-reviewed research and flag when recommendations differ from standard reference ranges.