Regional implementation of creatinine measurement standardization

Area of Science:

• Nephrology
• Clinical Chemistry
• Laboratory Medicine

Background:

• Serum creatinine measurements vary significantly between laboratories, impacting the accuracy of estimated glomerular filtration rate (eGFR).
• Standardization is essential for reliable comparison of eGFR values across different healthcare settings.

Purpose of the Study:

• To report the outcomes of a creatinine standardization program aimed at minimizing laboratory error in eGFR reporting.
• To assess the impact of standardization on the accuracy of eGFR calculations.

Main Methods:

• 107 laboratories voluntarily participated, using 124 analyzers from six manufacturers.
• Laboratories applied a correction factor to standardize creatinine measurements to the isotope dilution mass spectrometry reference method.
• Standardized creatinine values were used to calculate eGFR with the Modification of Diet in Renal Disease (MDRD) equation.

Main Results:

• The standardization program reduced average total creatinine measurement error from 23.9% to 8.7%.
• Average analytical bias in creatinine measurement decreased from 16.5% to 2.7%.
• Implementation could decrease incorrect stage 3 chronic kidney disease classifications by 84%.

Conclusions:

• Creatinine standardization effectively minimizes laboratory error in eGFR reporting.
• Standardization enhances the reliability of eGFR for clinical decision-making.
• Widespread adoption can significantly improve the accuracy of chronic kidney disease staging.