Reference Range Methodology
Last scientific content review: 26 June 2026
Why ranges differ
Two laboratories testing the same blood sample can publish different reference intervals because they use different analysers, reagents, units and reference populations. The range printed on your own laboratory report is always the most reliable interpretation context for that result.
Supported regions
- United States (US conventional units).
- United Kingdom (NHS / UK pathology conventions).
- France (SI units, French laboratory conventions).
- International (SI units fallback).
For every marker we maintain
- Marker name and synonyms.
- US range.
- UK range.
- France range.
- International range.
- Source reference(s).
- Review date.
- Clinical reviewer.
Sources
Reference ranges are curated against recognised healthcare and laboratory guidance, including CDC, American Heart Association, USPSTF, NHS, NICE, and peer-reviewed laboratory medicine literature.
Limitations
- Ranges shown are for educational guidance, not for clinical decision-making.
- Specialist populations (children, pregnancy, athletes, dialysis patients, etc.) frequently have different ranges.
- Always interpret your own result against the range printed on your own laboratory report and in clinical context with your healthcare professional.
Developed, reviewed and maintained by the Detectives Health Team under the scientific leadership of Steve Diongo · Last scientific content review: 26 June 2026
Educational information only.
Detectives Health provides educational explanations of laboratory results.
It does not diagnose disease, prescribe treatment or replace professional medical advice.
Always seek advice from your GP, physician or other appropriately qualified healthcare professional regarding your individual circumstances. Contact us with feedback on this policy.