Why do reference ranges vary between Australian labs?
Most Australian labs follow RCPA-harmonised reference ranges for common chemistry and haematology tests. Variations exist because different labs use different analyser platforms (e.g. Roche, Siemens, Abbott, Beckman) and different assay reagents — particularly for hormones (testosterone, estradiol, AMH, vitamin D), where the exact range can differ by 5–15% between labs. Always interpret your result against the specific range printed on your own report, not against a different lab's range.
Are reference ranges the same for men and women?
For most chemistry tests (glucose, electrolytes, creatinine, liver enzymes, lipids), no — sex-specific ranges apply. Common examples: haemoglobin (115–160 g/L women, 130–180 g/L men), creatinine (45–90 µmol/L women, 60–110 µmol/L men), GGT (<40 U/L women, <60 U/L men), ferritin (15–200 µg/L women, 30–300 µg/L men). For hormones, sex-specific ranges and life-stage ranges (premenopausal, pregnancy, postmenopausal) all apply.
Are reference ranges the same for all ages?
No. Many tests have age-adjusted normal ranges. The most clinically important examples in Australian practice: creatinine and eGFR (which decline naturally with age — eGFR <60 in a 25-year-old is concerning, in an 85-year-old often expected); PSA (rises with age — see PSA guide); ALP (much higher in growing children); haemoglobin (lower targets accepted in adults >65). For paediatric ranges, always use lab-supplied age-banded values.
What does 'within normal range' actually mean?
A reference range typically captures where 95% of the apparently healthy reference population falls — meaning 5% of perfectly healthy people will sit just outside the range on any given test. A single 'abnormal' result rarely indicates disease on its own. Conversely, 'within range' is not the same as 'optimal' — many markers (vitamin D, ferritin, HbA1c) have ranges where the lower end is technically normal but functionally suboptimal.
How often do Australian reference ranges change?
Major harmonisation projects led by the RCPA and AACB (Australasian Association for Clinical Biochemists) update reference ranges every few years for specific tests. Recent examples: the 2024 ferritin range update (Douglass Hanly Moir adopted 30 µg/L as the new lower limit for adults), the IFCC standardisation of HbA1c reporting (mmol/mol units adopted nationally in 2011), and ongoing harmonisation of vitamin D thresholds. This page reflects the published 2026 standards.
Where does this data come from?
Reference ranges in this guide are compiled from the RCPA Manual, Pathology Tests Explained Australia, individual lab handbooks (Sullivan Nicolaides, Dorevitch, Laverty, Australian Clinical Labs, Douglass Hanly Moir), and current RACGP, Endocrine Society of Australia, and Cancer Council Australia clinical guidelines. Always cross-reference against the range printed on your own pathology report, since assay platform variations apply.
Can I use this page to interpret my own results?
This page is a quick-lookup reference — not a substitute for medical interpretation. A result outside the reference range is not the same as a diagnosis. Your GP interprets each result alongside your symptoms, history, medications, and other markers — patterns matter more than individual numbers. Use this page to understand what your results show, then discuss with your GP.