Analyte determination method and analyte meter
First Claim
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1. A method for determining an analyte in a sample comprising the steps of:
- (a) placing the sample in an electrochemical test cell comprising a working electrode and a counter electrode and a mediator that serves in reduced form as a charge carrier in the electrochemical determination of the analyte, wherein the sample is subject to oxygen attrition in the electrochemical test cell,(b) applying a DC signal between the working and counter electrodes to produce a DC output signal,(c) evaluating the DC output signal to determine an uncorrected result for the determination of analyte in the sample;
(d) determining an additive correction term for the amount of oxygen in the sample, said additive correction term being independent of pO2 and glucose concentration in the sample, and(e) adding the correction term of step (d) to the uncorrected result of step (c) to provide a corrected determination of analyte in the sample,wherein the additive correction term for the amount of oxygen in the sample is determined as a function of the temperature of the sample and a measurement that reflects the oxygen carrying capacity of the sample.
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Abstract
The presence of oxygen or red blood cells in a sample applied to an electrochemical test strip that makes use of a reduced mediator is corrected for by an additive correction factor that is determined as a function of the temperature of the sample and a measurement that reflects the oxygen carrying capacity of the sample. The measured oxygen carrying capacity can also be used to determine hematocrit and to distinguish between blood samples and control solutions applied to a test strip.
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14 Claims
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1. A method for determining an analyte in a sample comprising the steps of:
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(a) placing the sample in an electrochemical test cell comprising a working electrode and a counter electrode and a mediator that serves in reduced form as a charge carrier in the electrochemical determination of the analyte, wherein the sample is subject to oxygen attrition in the electrochemical test cell, (b) applying a DC signal between the working and counter electrodes to produce a DC output signal, (c) evaluating the DC output signal to determine an uncorrected result for the determination of analyte in the sample; (d) determining an additive correction term for the amount of oxygen in the sample, said additive correction term being independent of pO2 and glucose concentration in the sample, and (e) adding the correction term of step (d) to the uncorrected result of step (c) to provide a corrected determination of analyte in the sample, wherein the additive correction term for the amount of oxygen in the sample is determined as a function of the temperature of the sample and a measurement that reflects the oxygen carrying capacity of the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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