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Implications of different DCCT-aligned HbA1c methods on GMS clinical indicators

P J Twomey1, G Rayman, D R Pledger

  • 1Department of Clinical Biochemistry, The Ipswich Hospital, Ipswich, UK. ptwomey@nhs.net

Diabetic Medicine : a Journal of the British Diabetic Association
|January 18, 2008
PubMed

Insights

Different glycated haemoglobin (HbA1c) testing methods impact diabetes management under UK General Medical Services (GMS) contracts. Understanding these HbA1c method limitations is crucial for healthcare professionals and policymakers.

Area of Science:

  • Clinical Chemistry
  • Diabetes Mellitus Management
  • Health Policy

Background:

  • The UK General Medical Services (GMS) contract incentivizes diabetes care, including glycated haemoglobin (HbA1c) testing.
  • Specific codes (DM5-DM7) focus on HbA1c targets, contributing significantly to practice income.
  • Variability in HbA1c testing methods may affect achievement of treatment targets.

Purpose of the Study:

  • To compare two routinely used Diabetes Control and Complications Trial (DCCT)-aligned HbA1c methods.
  • To assess if differences in HbA1c assay results could lead to variations in achieving treatment targets across UK general practices.

Main Methods:

  • A comparative analysis of two HbA1c testing platforms: DCA 2000+ Analyser and Variant II analyser.
  • 164 patient samples were randomly selected and analyzed on both devices.

Main Results:

  • A statistically significant difference (P < 10(-09)) was observed between the two HbA1c methods.
  • Despite a small mean difference (6.5%), the methods classified 18.9% of patients (31 individuals) differently regarding the DM6 GMS target (HbA1c ≤ 7.4%).
  • The DCA 2000+ Analyser identified more patients below the target (38.4%) compared to the Variant II analyser (19.5%).

Conclusions:

  • While DCCT-alignment has improved HbA1c value transferability, it has not eliminated method-dependent discrepancies.
  • Healthcare professionals and policymakers must be aware of the limitations of current DCCT-aligned HbA1c assays.
  • These limitations have potential financial and clinical implications for diabetes care delivery and performance monitoring.
Abstract

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