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Correlation of same-visit HbA1c test with laboratory-based measurements: a MetroNet study
Kendra L Schwartz1, Joseph C Monsur, Monina G Bartoces
1Department of Family Medicine, Wayne State University School of Medicine, 101 E. Alexandrine, Detroit, MI 48201, USA. kensch@med.wayne.edu
BMC Family Practice
|July 15, 2005
Summary
Same-visit glycated hemoglobin (HbA1c) testing shows moderate correlation with lab methods but may be less accurate and time-consuming for busy clinics. Further comparison is needed before implementation.
Area of Science:
- Clinical Chemistry
- Point-of-Care Testing
- Diabetes Management
Background:
- Glycated hemoglobin (HbA1c) results vary significantly based on the analytical method used.
- Implementing same-visit HbA1c testing offers potential for more efficient patient care and improved diabetes management.
- Variability in HbA1c testing methods necessitates evaluation of new methodologies in clinical settings.
Purpose of the Study:
- To assess the feasibility of introducing same-visit HbA1c testing in busy family practice centers (FPCs).
- To determine the correlation between a same-visit HbA1c test (BIO-RAD Micromat II) and established laboratory methods.
- To evaluate the practical utility of same-visit HbA1c testing in a real-world clinical environment.
Main Methods:
- 147 paired capillary blood samples were collected from diabetic patients for same-visit testing using the BIO-RAD Micromat II.
- Results from the Micromat II were compared against three different laboratory HbA1c analysis methods: ion-exchange HPLC, boronate-affinity HPLC, and immuno-turbidimetric analysis.
- Feasibility was assessed by observing the time required and ease of use for medical staff.
Main Results:
- The Pearson correlation coefficients between the Micromat II and laboratory methods ranged from 0.713 to 0.927, all lower than the manufacturer's reported 0.96.
- The Micromat II consistently yielded lower mean HbA1c values compared to laboratory analyses across all methods evaluated.
- Medical staff reported difficulties in performing the same-visit test due to the significant time commitment required.
Conclusions:
- The correlation of same-visit HbA1c testing with laboratory methods may be lower than manufacturer claims, potentially due to user variability.
- Lower mean HbA1c results from the same-visit test compared to laboratory analysis require careful consideration.
- The time demands of the same-visit assay may limit its practical application in high-volume clinical settings, necessitating careful evaluation before adoption.