Comparing HbA1C by POC and HPLC

Abstract

Objective: Point-of-care (POC) Hemoglobin A1C (HbA1C) testing is frequently used to assess glycemic control in diabetes management. Studies are lacking on the comparison of POC with high performance liquid chromatography (HPLC) when the POC HbA1C is ≥ 14%.

Methods: Retrospective chart review of children with T1DM at Rhode Island Hospital from 2007-2013. Primary objective was to delineate the range of HPLC HbA1C values when the POC is ≥ 14% and characterize these patients.

Primary results: There were 72 patients, 5-21 years old, with corresponding POC and HPLC tests. Nineteen children, mean age 16.1 years, had a POC HbA1C ≥ 14%. Their mean HPLC value was 14.1% (95% CI [13.4, 14.8]), with range 11.1-16.3 and standard deviation 1.4%.

Conclusion: There is wide variation when POC HbA1C values are ≥ 14%. We suggest routine central HbA1C testing when the POC is ≥ 14% for proper counseling and follow-up of glycemic control. Tracking relative changes in HbA1C at subsequent clinic visits is important as it allows clinicians to gauge whether or not interventions are effective. Additionally, knowledge that their HbA1C is trending down may provide positive reinforcement to adolescents.

Keywords: HbA1C; Type 1; diabetes; pediatrics; point-of-care.