[Introduction of the NGSP value in clinical practice and later]

Area of Science:

• Clinical Chemistry
• Laboratory Medicine
• Endocrinology

Background:

• The National Glycohemoglobin Standardization Program (NGSP) value for Hemoglobin A1c (HbA1c) is the established global standard.
• Japan previously used the Japan Diabetes Society (JDS) value for HbA1c measurements.
• A transition from JDS to NGSP values in Japanese clinical practice began in April 2012.

Purpose of the Study:

• To analyze the transition of HbA1c measurement standards in Japan from JDS to NGSP.
• To evaluate the impact and potential challenges of adopting the NGSP value in clinical practice and health examinations.
• To discuss the future goal of international standardization of HbA1c measurements traceable to SI units.

Main Methods:

• Observational analysis of the timeline and implementation of the NGSP value adoption in Japan.
• Assessment of clinical practice and stakeholder preparedness during the transition period.
• Speculative analysis of factors contributing to the observed level of confusion (or lack thereof).

Main Results:

• The replacement of JDS with NGSP values in clinical practice (April 2012) and upcoming health examinations (April 2013) has been managed with minimal confusion.
• Limited preparation time for laboratories and manufacturers due to the delayed finalization of the JDS timeline.
• Potential for confusion is anticipated with the full consolidation of NGSP values in April 2014.

Conclusions:

• Effective communication and parallel reporting of JDS and NGSP values likely mitigated initial confusion.
• The full consolidation of the NGSP value in April 2014 requires careful management to prevent disruption.
• Achieving international standardization of HbA1c, traceable to SI units, remains the ultimate objective.