Evaluation of the One Touch Glucose Meter for Use by a Phlebotomy Team

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Abstract
In late 1986, we initiated a hospital reflectance meter glucose program with the Phlebotomy Service performing the determinations. In 1988, it became necessary to replace the original meters, and an evaluation of the Lifescan One Touch Meter was undertaken. Twelve One Touch meters were used during the course of the evaluation. The One Touch reagent strips incorporate the well-established glucose oxidase/peroxidase chemistry. Precision studies on a single meter (within-day and day-to-day) were performed using manufacturer’s controls and heparinized whole blood when appropriate. Precision was acceptable, with the coefficient of variation ranging from 1.1% to 4.7% (within-run) and 2.8% to 4.6% (day-to-day). Recovery studies using a single meter demonstrated acceptable recoveries (94% to 106%) within the range of 72 to 397 mg/dL (4.0 to 21.8 mmoll L) of glucose. Correlation studies of the One Touch meters (x) with the Beckman Astra-8 (y) gave correlation coefficients of 0.979 (n=267) and 0.966 (n=198) in two separate studies (six meters and twelve meters). Linear- regression equations were, respectively, y=0.947×+2.7 mg/dL (n=267) andy=0.88×+14.4 mg/dL (n=198). In both split-sample comparison studies (n=267) and blind-sample comparison studies (n=279) with the clinical laboratory, 7.5% and 7.2% (respectively) of data pairs greater than 100 mg/dL (5.5 mmol/L) showed differences greater than 15% between the One Touch meters and laboratory method. In the majority of the cases, the One Touch meter underestimated rather than overestimated the glucose value.

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