Method of correcting for oxygen effect on test sensors
First Claim
1. A method for correcting the oxygen effect in determining the concentration of glucose in a fluid using an electrochemical test sensor, the method comprising the acts of:
- providing a test sensor, the test sensor comprising a base, first and second working electrodes, and a counter electrode, the first working electrode including glucose oxidase, an oxidized form of a mediator and peroxidase, the second working electrode including glucose oxidase and the oxidized form of the mediator, the first working electrode, the second working electrode and the counter electrode being adjacent to the base;
contacting the test sensor to a meter to form an electrical connection;
placing the fluid on the test sensor;
measuring a first current from the first working electrode from the reduced form of the mediator;
measuring a second current from the second working electrode from the reduced form of the mediator; and
determining the concentration of glucose and correcting for the oxygen effect by using the first current measurement and the second current measurement.
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Accused Products
Abstract
An electrochemical test sensor is adapted to measure glucose and correct for the oxygen effect in a fluid sample. The test sensor comprises a base, first and second working electrodes, and a counter electrode. The first working electrode includes glucose oxidase, a mediator and peroxidase. The second working electrode includes glucose oxidase and the mediator. The first working electrode, the second working electrode and the counter electrode are located on the base. In other embodiments, an electrochemical test sensor is adapted to measure cholesterol, lactate, pyruvate or xanthine and correct for the oxygen effect in a fluid sample.
18 Citations
28 Claims
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1. A method for correcting the oxygen effect in determining the concentration of glucose in a fluid using an electrochemical test sensor, the method comprising the acts of:
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providing a test sensor, the test sensor comprising a base, first and second working electrodes, and a counter electrode, the first working electrode including glucose oxidase, an oxidized form of a mediator and peroxidase, the second working electrode including glucose oxidase and the oxidized form of the mediator, the first working electrode, the second working electrode and the counter electrode being adjacent to the base; contacting the test sensor to a meter to form an electrical connection; placing the fluid on the test sensor; measuring a first current from the first working electrode from the reduced form of the mediator; measuring a second current from the second working electrode from the reduced form of the mediator; and determining the concentration of glucose and correcting for the oxygen effect by using the first current measurement and the second current measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for correcting the oxygen effect in determining the concentration of glucose in a fluid using an electrochemical test sensor, the method comprising the acts of:
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providing a test sensor, the test sensor comprising a base, first and second working electrodes, and a counter electrode, the first working electrode including glucose oxidase, an oxidized form of mediator and peroxidase, the second working electrode including glucose oxidase and the oxidized form of the mediator in the absence of the peroxidase, the first working electrode, the second working electrode and the counter electrode being adjacent to the base; contacting the test sensor to a meter to form an electrical connection; placing the fluid on the test sensor; measuring a first current from the first working electrode from the reduced form of the mediator; measuring a second current from the second working electrode from the reduced form of the mediator; and determining the concentration of glucose and correcting for the oxygen effect by using the first current measurement and the second current measurement. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for correcting the oxygen effect in determining the concentration of cholesterol in a fluid using an electrochemical test sensor, the method comprising the acts of:
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providing a test sensor, the test sensor comprising a base, first and second working electrodes, and a counter electrode, the first working electrode including cholesterol oxidase, an oxidized form of mediator and peroxidase, the second working electrode including cholesterol oxidase and the oxidized form of the mediator, the first working electrode, the second working electrode and the counter electrode being adjacent to the base; contacting the test sensor to a meter to form an electrical connection; placing the fluid on the test sensor; measuring a first current from the first working electrode from the reduced form of the mediator; measuring a second current from the second working electrode from the reduced form of the mediator; and determining the concentration of cholesterol and correcting of the oxygen effect using the first current measurement and the second current measurement. - View Dependent Claims (19)
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20. A method for correcting the oxygen effect in determining the concentration of at least one of lactate, pyruvate or xanthine in a fluid using an electrochemical test sensor, the method comprising the acts of:
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providing a test sensor, the test sensor comprising a base, first and second working electrodes, and a counter electrode, the first working electrode including lactate, pyruvate or xanthine oxidase, an oxidized form of mediator and peroxidase, the second working electrode including lactate, pyruvate or xanthine oxidase and the oxidized form of the mediator, the first working electrode, the second working electrode and the counter electrode being adjacent to the base; contacting the test sensor to a meter to form an electrical connection; placing the fluid on the test sensor; measuring a first current from the first working electrode from the reduced form of the mediator; measuring a second current from the second working electrode from the reduced form of the mediator; and determining the concentration of lactate, pyruvate or xanthine and correcting of the oxygen effect using the first current measurement and the second current measurement.
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21. A method for correcting the oxygen effect in determining the concentration of glucose in a fluid using an electrochemical test sensor, the method comprising the acts of:
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providing a test sensor, the test sensor comprising a base, first and second working electrodes, a counter electrode and a lid, the first working electrode including glucose oxidase, a mediator and peroxidase, the second working electrode including glucose oxidase and the mediator, the first working electrode, the second working electrode and the counter electrode being adjacent to the base, the base and the lid assisting in forming one generally flat channel with a test sensor opening; contacting the test sensor to a meter to form an electrical connection; placing the fluid into the channel via the test sensor opening; contacting the fluid with the first working electrode and the second working electrode in the generally flat channel; measuring a first current from the first working electrode; measuring a second current from the second working electrode; and determining the concentration of glucose and correcting for the oxygen effect by using the first current measurement and the second current measurement. - View Dependent Claims (22, 23)
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24. A method for correcting the oxygen effect in determining the concentration of glucose in a fluid using an electrochemical test sensor, the method comprising the acts of:
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providing a test sensor, the test sensor comprising a base, first and second working electrodes, a counter electrode and a lid, the first working electrode including glucose oxidase, a mediator and peroxidase, the second working electrode including glucose oxidase and the mediator in the absence of the peroxidase, the first working electrode, the second working electrode and the counter electrode being adjacent to the base, the base and the lid assisting in forming one generally flat channel with a test sensor opening; contacting the test sensor to a meter to form an electrical connection; placing the fluid into the channel via the test sensor opening; contacting the fluid with the first working electrode and the second working electrode in the generally flat channel; measuring a first current from the first working electrode; measuring a second current from the second working electrode; and determining the concentration of glucose and correcting for the oxygen effect by using the first current measurement and the second current measurement. - View Dependent Claims (25)
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26. A method for correcting the oxygen effect in determining the concentration of cholesterol in a fluid using an electrochemical test sensor, the method comprising the acts of:
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providing a test sensor, the test sensor comprising a base, first and second working electrodes, a counter electrode and a lid, the first working electrode including cholesterol oxidase, a mediator and peroxidase, the second working electrode including cholesterol oxidase and the mediator, the first working electrode, the second working electrode and the counter electrode being adjacent to the base, the base and the lid assisting in forming one generally flat channel with a test sensor opening; contacting the test sensor to a meter to form an electrical connection; placing the fluid into the channel via the test sensor opening; contacting the fluid with the first working electrode and the second working electrode in the generally flat channel; measuring a first current from the first working electrode; measuring a second current from the second working electrode; and determining the concentration of cholesterol and correcting of the oxygen effect using the first current measurement and the second current measurement. - View Dependent Claims (27)
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28. A method for correcting the oxygen effect in determining the concentration of at least one of lactate, pyruvate or xanthine in a fluid using an electrochemical test sensor, the method comprising the acts of:
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providing a test sensor, the test sensor comprising a base, first and second working electrodes, a counter electrode and a lid, the first working electrode including lactate, pyruvate or xanthine oxidase, a mediator and peroxidase, the second working electrode including lactate, pyruvate or xanthine oxidase and the mediator, the first working electrode, the second working electrode and the counter electrode being adjacent to the base, the base and the lid assisting in forming one generally flat channel with a test sensor opening; contacting the test sensor to a meter to form an electrical connection; placing the fluid into the channel via the test sensor opening; contacting the fluid with the first working electrode and the second working electrode in the generally flat channel; measuring a first current from the first working electrode; measuring a second current from the second working electrode; and determining the concentration of lactate, pyruvate or xanthine and correcting of the oxygen effect using the first current measurement and the second current measurement.
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Specification