Clinical Accuracy of a Glucose Oxidase-Based Blood Glucose Test-Strip Across Extremes of Oxygen Partial Pressure

Background: Glucose oxidase (GOx)-based blood glucose monitors (BGMs) are influenced by the partial pressure of oxygen (Po-2) within the applied sample. Limited in-clinic data exists regarding the quantitative effect of Po-2 in unmanipulated capillary fingertip blood samples across physiologically representative glucose and Po-2 ranges. Method: Clinical accuracy data were collected as part of a BGM manufacturer's ongoing post-market surveillance program for a commercially available GOx-based BGM test-strip. The data set comprised 29 901 paired BGM-comparator readings and corresponding Po-2 values from 5 428 blood samples from a panel of 975 subjects. Results: A linear regression-calculated bias range of 5.22% (+0.72% [low Po-2: 45 mm Hg] to -4.5% [high Po-2: 105 mm Hg]); biases calculated as absolute at o(2) of 75 mm Hg, a linear regression bias of +3.14% was calculated at low Po-2, while negligible impact on bias (regression slope: +0.002%) was observed at higher than nominal levels (>75 mm Hg). When evaluating BGM performance under corner conditions of low (<70 mg/dL) and high (>180 mg/dL) glucose, combined with low and high Po-2, linear regression biases ranged from +1.52% to -5.32% within this small group of subjects and with no readings recorded at o(2). Conclusions: Data from this large-scale clinical study, performed on unmanipulated fingertip capillary bloods from a diverse diabetes population, indicate Po-2 sensitivity of the BGM to be markedly lower than published studies, which are mainly laboratory-based, requiring artificial manipulation of oxygen levels in aliquots of venous blood.