Accuracy of point-of-care HbA1c testing in pregnant women

The Australian & New Zealand Journal of Obstetrics & Gynaecology
Katherine CullineyHUMBA Study Group

Abstract

In New Zealand, it is recommended that all pregnant women have a haemoglobin A1c (HbA1c) test performed with their booking antenatal bloods to identify previously unrecognised diabetes. However, screening rates in some groups are low. Use of a point-of-care device may improve compliance with screening. To assess the accuracy of the COBAS b101 point-of-care system referenced against a laboratory method, for measurement of HbA1c levels in pregnant women. Convenience sample of 40 obese pregnant women enrolled in a clinical trial. HbA1c was assayed in paired capillary and venous whole blood samples using the COBAS b101 point-of-care system and Primus Ultra2 high performance liquid chromatography laboratory analyser, respectively. The accuracy of the point-of-care system was assessed by Bland-Altman analysis. The mean (SD) laboratory HbA1c was 35.9 (2.0) mmol/mol. The COBAS b101 point-of-care system, compared with the laboratory reference method, had a small negative bias for HbA1c (-1.0 mmol/mol, 95% CI -2.0 to -0.03, P = 0.03) and relatively wide 95% limits of agreement (-7.2 to 5.1 mmol/mol). In conclusion, we found that in pregnancy, the COBAS b101 point-of-care system has a small negative bias and modest point accuracy for HbA1...Continue Reading

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