Hormones
24-Hour Urine Cortisol vs DUTCH Test: Which to Use
Comparing 24-hour urinary free cortisol (UFC) with the DUTCH dried urine panel: what each measures, sensitivity for Cushing's, and Australian availability.
Biological Age Testing: What Epigenetic Clocks Show
Biological age blood testing in Australia: how epigenetic clocks like GrimAge and DunedinPACE measure your true ageing rate from one blood sample today.
metabolic
Levels vs Lingo vs Stelo: The Full CGM Comparison 2026
Three non-prescription CGMs compete for the metabolic health market: Levels (Dexcom sensors plus app), Lingo (Abbott consumer-direct), and Stelo, compared.
metabolic
OGTT vs HbA1c: Which Test Finds Dysglycaemia First?
OGTT versus HbA1c versus fasting glucose: what each test actually measures, where HbA1c misses early dysglycaemia, and when to use each one in Australia.
Hormones
How to Read an IGF-1 Result: Age-Adjusted Ranges and the GH Axis
Why an IGF-1 blood result only makes sense against age- and sex-adjusted reference ranges, how labs express it as an SDS/z-score, what low and high values reflect in research, and why assays differ.
DHEA-S Blood Test: Adrenal Reserve and Longevity Marker
DHEA-S is the most abundant adrenal steroid and one of the strongest predictors of biological age. What low and high DHEA-S mean, and how to test for it.
Bloodwork
MTHFR Genetic Testing: A Functional Interpretation Guide
MTHFR is the most over-interpreted SNP in functional medicine. C677T and A1298C variants, and why a result means little without homocysteine, B12, and folate.
thyroid
Thyroid Antibodies TPO & TgAb: What Your Results Mean
TPO antibodies, TgAb, and TRAb explained: Hashimoto's vs Graves', what elevated antibodies with normal TSH mean, and how monitoring works in Australia.
Bloodwork
Iron Panel Complete Guide: Every Marker Explained Fully
This complete iron panel guide has been merged into our ferritin and iron panel article, which now covers every marker in one comprehensive reference page.
Bloodwork
PSA Optimal Ranges: Beyond the Standard 4.0 Cutoff
PSA interpretation is more than one number against a 4.0 ng/mL cutoff. Age-adjusted ranges, the free to total PSA ratio, and confounders that distort results.
Hormones
Prolactin Blood Test: Interpretation for Men and Women
Prolactin peaks overnight and falls through the morning; venepuncture stress and macroprolactin can fake a high result. Causes run from prolactinoma to drugs.
HOMA-IR: How to Interpret Your Insulin Resistance Score
How to calculate and interpret your HOMA-IR score from fasting glucose and insulin, understand optimal versus at-risk ranges, and what drives resistance.
Bloodwork
Comprehensive Lipid Panel: HDL, LDL and Triglycerides
A walkthrough of the standard lipid panel: HDL, LDL (calculated and direct), triglycerides, non-HDL and VLDL, measured against functional optimal targets.
Bloodwork
Kidney Function Panel: eGFR, Creatinine, and Cystatin C
A walkthrough of the Australian kidney panel: creatinine and the race-free CKD-EPI 2021 eGFR, urea, cystatin C, and urine ACR, set against CKD G1 to G5 staging.
CRP Blood Test Australia: hs-CRP Optimal Levels Guide
Standard CRP versus hs-CRP explained, AHA cardiovascular risk categories, functional optimal targets, and evidence-based ways to lower inflammation naturally.
testing
Private Blood Test Australia: No GP Referral Needed
You can order a comprehensive blood panel in Australia without a GP referral. Self-referral providers, Medicare versus private costs, and markers to include.
thyroid
Reverse T3: The Thyroid Marker Your Doctor Probably Didn't Test
Reverse T3 is the inactive thyroid hormone that competes with T3 at the receptor. What drives high rT3, and what it means for your thyroid function overall.
GGT Blood Test: More Than Just an Alcohol Use Marker
GGT is elevated by far more than alcohol: NAFLD, oxidative stress, metabolic syndrome, and drug exposure all drive it up. Optimal GGT sits below the lab range.
Hormones
AMH Ovarian Reserve Test Australia: What It Measures
The AMH ovarian reserve test Australia measures egg supply, not fertility. Learn age-based pmol/L ranges, PCOS patterns, IVF relevance, and what it cannot predict.
SHBG Blood Test: What Determines Free Testosterone
SHBG controls how much testosterone actually reaches your cells. What drives high and low SHBG, optimal ranges, and how to calculate free testosterone.
Ferritin and Iron Panel: Optimal vs Normal Ranges Guide
How to interpret your ferritin and full iron panel in Australia: optimal versus lab-normal ranges, the 'normal but symptomatic' pattern, and its causes.
How to Interpret Your Blood Test Results (Australia)
A practical guide to reading your Australian blood test results: CBC, metabolic panel, hormones, and thyroid markers, using functional optimal ranges.
Lipoprotein(a): The Genetic Cardiovascular Risk Marker
Lp(a) is up to 90 percent heritable and absent from standard lipid panels, yet it's one of the strongest independent predictors of early cardiovascular disease.
reference
Australian Biomarker Optimal-Range Reference (2026)
A comprehensive Australian SI-unit reference comparing lab ranges with functional optimal ranges for 60+ biomarkers across metabolic, lipid, and hormone panels.
Coronary Artery Calcium Score Australia: CV Risk Guide
Coronary artery calcium score uses cardiac CT to stratify CV risk. Agatston ranges, age targets, Australian private costs, and integration with ApoB and Lp(a).
cardiovascular
Omega-3 Index Blood Test: Optimal Targets Explained
The omega-3 index measures EPA and DHA as a share of red blood cell fatty acids. An index below 4 percent carries higher cardiovascular mortality risk.
Bloodwork
Homocysteine: The Cardiovascular Risk Marker Missed
Elevated homocysteine is an independent cardiovascular and dementia risk factor, and a direct readout of your B vitamin status and methylation capacity.
metabolic
Lipoprotein Insulin Resistance Score (LP-IR) Guide
LP-IR is an NMR-derived index that detects lipoprotein-pattern insulin resistance years before fasting glucose or HOMA-IR become abnormal. Australian context, interpretation, and evidence reviewed.
Hormones
Progesterone Blood Test: Optimal Ranges, Fully Explained
Progesterone is the most misinterpreted hormone on a standard blood panel. Reference ranges ignore cycle phase, and testing at the wrong time ruins the result.
CBC Blood Test: Optimal Ranges Beyond the Lab Normal
Understand your CBC results using functional optimal ranges, not just lab normals, in Australian units throughout. Covers the WBC differential and RBC indices.
Hormones
Fasting Insulin: Australia's Most Underordered Test
Fasting insulin reveals insulin resistance years before glucose or HbA1c move. Optimal ranges, HOMA-IR calculation, and what elevated insulin predicts.
testing
How to Interpret Your Estradiol (E2) Blood Test Result
How to read your estradiol (E2) blood test result: the assay you need, how to interpret it for your sex and context, and its link to testosterone and SHBG.
metabolic
HbA1c: Optimal Ranges Beyond the Diabetes Threshold
HbA1c is used almost exclusively to diagnose diabetes, but its metabolic signal starts well below that cut-off. What optimal HbA1c targets actually look like.
Bloodwork
Apolipoprotein B (ApoB): The Risk Marker Doctors Skip
ApoB counts every atherogenic lipoprotein particle in your blood: LDL, VLDL, IDL, and Lp(a). Why it beats LDL-C for cardiovascular risk, plus optimal ranges.
Vitamin D Blood Test Australia: Optimal Levels Guide
How to interpret your 25-OH vitamin D blood test in Australia: optimal versus normal ranges, deficiency thresholds, test types, and supplementation protocols.
testing
The Australian Private Blood Testing Directory (2026)
A directory of private and self-referral blood testing providers in Australia, including RoidSafe, iMedical, i-screen, NutriPATH, and Laverty, with pricing.
Hormones
Cortisol Awakening Response and the DUTCH Test Guide
The cortisol awakening response is a 50 to 160 percent spike within 30 to 45 minutes of waking. How the DUTCH test captures this distinctive daily pattern.
liver
ALT and AST: Optimal Liver Enzyme Ranges Explained
ALT and AST are the primary liver markers on standard panels. What drives elevation, what 'normal' misses versus optimal, and how the ALT/AST ratio helps.
nutrients
Vitamin B12 Blood Test: Serum, Active B12, and MMA
Serum B12 is notoriously unreliable as a sole marker. Why functional B12 status requires understanding holotranscobalamin (active B12) and methylmalonic acid.
Hormones
How to Interpret Your Testosterone Blood Test Results
Total testosterone tells you less than you think. Free testosterone, SHBG, and the ratio between them determine how much androgen activity cells can use.
metabolic
Uric Acid: The Overlooked Metabolic Marker Beyond Gout
Uric acid is rarely discussed outside gout, but elevated levels predict insulin resistance, cardiovascular risk, and fatty liver years before disease appears.
Hormones
Estradiol (E2) Optimal Ranges by Life Stage and Sex
What optimal estradiol actually looks like by life stage and sex, beyond the wide lab reference range: functional E2 targets across a woman's life stages.
iron
Ferritin: Optimal Levels and What High Ferritin Means
This ferritin and iron stores article has been merged into our complete ferritin and iron panel guide, covering optimal ranges and haemochromatosis screening.
Hormones
Cortisol and DHEA-S: How to Read the Adrenal Panel
A single AM cortisol number tells you almost nothing about HPA axis health. DHEA-S, the cortisol to DHEA ratio, and a saliva curve reveal what serum hides.
Peptides
Retatrutide vs Tirzepatide: What the Receptors Mean
Tirzepatide activates GLP-1 and GIP receptors. Retatrutide adds glucagon on top. That third receptor changes energy expenditure and what needs monitoring.
Peptides
IGF-1 and GH interpretation: why serum GH tells you nothing
Serum GH is useless for monitoring growth hormone status. IGF-1 is the 24-hour integrated signal that actually reflects GH output and how to interpret it.
Hormones
Optimal Testosterone Ranges for Men: The Full Guide
Lab reference ranges for testosterone are built on population averages that include elderly, metabolically compromised men. Functional ranges for total T here.
Hormones
How to Read Your Thyroid Panel: Beyond TSH Explained
TSH is a pituitary hormone, not a thyroid hormone. Using it as your sole marker is like judging engine health by accelerator position. The full panel explained.