Biomarker Library

An A–Z reference of the biomarkers people most often want to understand. Each page explains, in plain English, what the marker measures, who should consider checking it, what "normal" can look like, and which Vital Trend Health panels include it.

Browse by category below, or jump to a specific marker.

Biomarkers by category

Thyroid

  • TSH (Thyroid Stimulating Hormone) — TSH is the brain's signal to your thyroid — and the most useful single number for screening thyroid function.
  • Free T4 (Free Thyroxine) — Free T4 is the active form of your main thyroid hormone — the natural follow-up when TSH looks unusual.

Iron & Energy

  • Ferritin — Ferritin is the gold-standard marker for your iron stores — more reliable than measuring iron in your blood directly.

Hormones

  • Testosterone — Total testosterone, free testosterone, and the binding protein — three markers, the number that actually matters.
  • Cortisol — Cortisol is your primary stress hormone — and a useful marker for sleep, recovery and adrenal function.

Fertility

  • AMH (Anti-Müllerian Hormone) — AMH is the gold-standard ovarian reserve marker — what fertility clinics and IVF programs use first.

Vitamins & Minerals

  • Vitamin D (25-hydroxyvitamin D) — Vitamin D is the most-tested nutrient in Australia — and one of the most commonly low, even with our climate.
  • Vitamin B12 (Cobalamin) — B12 is essential for nerve function and red blood cell production — and it's commonly low in vegetarians, vegans, and adults over 50.

Metabolic

  • HbA1c (Glycated Haemoglobin) — HbA1c is your average blood sugar over the last 3 months — the single best test for diabetes risk and long-term metabolic health.

Cardiovascular & Inflammation

  • CRP (C-reactive protein) — CRP is the most accessible measure of systemic inflammation in your body — a low-key but powerful health signal.

Don't see what you're looking for?

This library covers 10 of the most-asked-about biomarkers. We're adding more — iron studies, ApoB, lipoprotein(a), magnesium, oestradiol, progesterone, IGF-1 and more — over the coming weeks.

If you know which marker you want tested, the full panel catalogue shows every test we offer and the biomarkers each one includes.