K2-EDTA and K3-EDTA Greiner Tubes for HbA1c Measurement.

Area of Science:

• Clinical Chemistry
• Laboratory Medicine
• Hematology

Background:

• Glycosylated hemoglobin (HbA1c) is a critical biomarker for diabetes mellitus management.
• Accurate HbA1c measurement relies on appropriate sample collection and anticoagulant choice.
• Different forms of EDTA anticoagulants (K2-EDTA vs. K3-EDTA) are used in blood collection tubes.

Purpose of the Study:

• To evaluate the interchangeability of K2-EDTA and K3-EDTA Greiner tubes for HbA1c analysis.
• To determine if K2-EDTA and K3-EDTA tubes yield comparable results using the Abbott ARCHITECT HbA1c assay.
• To assess the clinical and statistical significance of any observed differences in HbA1c measurements between the two tube types.

Main Methods:

• Blood samples were collected from 45 outpatients into both K2-EDTA and K3-EDTA Greiner Vacuette tubes.
• HbA1c concentrations were measured using the Abbott ARCHITECT chemiluminescent microparticle assay on the ARCHITECT i2000SR immunoanalyzer.
• Statistical analysis included Wilcoxon test and Passing-Bablok regression to compare results from the two tube types.

Main Results:

• Median HbA1c levels were 54 mmol/mol for K2-EDTA and 56 mmol/mol for K3-EDTA tubes.
• No statistically significant difference was observed between K2-EDTA and K3-EDTA tubes (bias = -1.29 mmol/mol, P = 0.24).
• Passing-Bablok regression analysis indicated no constant or proportional error, with a slope of 1.00 (95% CI[0.98 to 1.06]).

Conclusions:

• K2-EDTA and K3-EDTA Greiner tubes demonstrate no clinically significant bias for HbA1c measurement.
• The findings support the safe and interchangeable use of both K2-EDTA and K3-EDTA tubes for HbA1c determination with the Abbott ARCHITECT assay.
• Laboratory protocols can confidently utilize either K2-EDTA or K3-EDTA tubes for routine HbA1c testing.