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Descriptive analytical data and consequences for calculation of common reference intervals in the Nordic Reference
1Fürst Medical Laboratory, Søren Bulls Vei 25, NO-1051 Oslo, Norway. prustad@furst.no
Summary
The Nordic Reference Interval Project (NORIP) established common reference intervals for 25 clinical biochemical properties across five Nordic countries. These intervals, based on data from 102 laboratories, ensure consistent diagnostic standards.
Area of Science:
- Clinical Chemistry
- Biochemistry
- Laboratory Medicine
Background:
- Clinical laboratories require standardized reference intervals for accurate patient diagnosis.
- Previous reference intervals varied significantly across different Nordic countries.
- The Nordic Reference Interval Project (NORIP) aimed to harmonize these intervals.
Purpose of the Study:
- To establish unified, gender- and age-specific reference intervals for common clinical biochemical properties in the Nordic region.
- To evaluate the analytical quality of routine laboratory methods used in the project.
- To compare newly derived reference intervals with existing textbook values.
Main Methods:
- Collected analytical data from 102 Nordic clinical chemical laboratories for 25 biochemical properties.
- Utilized traceable reference materials and International Federation of Clinical Chemistry (IFCC) compatible methods for enzyme analysis.
- Employed non-parametric calculations and objective criteria for subgroup partitioning (age, gender).
Main Results:
- Established gender- and age-specific reference intervals applicable across all five Nordic countries.
- Presented detailed data on measurement values, method comparisons, and control corrections.
- Demonstrated consistency in analytical quality across participating laboratories.
Conclusions:
- A single set of reference intervals is suitable for all five Nordic countries, simplifying clinical interpretation.
- The NORIP project provides a robust foundation for harmonized clinical chemistry diagnostics in the region.
- Standardized reference intervals enhance diagnostic accuracy and patient care throughout the Nordic countries.
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