Determination of blood glucose in a small volume and in a short test time
First Claim
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1. A method of determining the concentration of glucose in a blood sample, wherein the blood sample is added to a disposable, electrochemical biosensor test strip comprising:
- providing the disposable, electrochemical biosensor test strip including a capillary chamber having a depth suitable for capillary flow of blood, and holding a volume from about 0.2 to about 0.6 μ
l of the blood sample, and a reagent within the capillary chamber, the reagent including an enzyme and a mediator;
applying a blood sample containing glucose into the capillary chamber, the capillary chamber directing capillary flow of the blood sample into contact with the reagent to cause the blood sample to at least partially solubilize or hydrate the reagent, the glucose reacting with the reagent to produce an electroactive reaction product;
detecting the blood sample in the capillary chamber;
following said detecting, providing a delay period prior to electrooxidizing the electroactive reaction product;
following said delay period, electrooxidizing the electroactive reaction product, said electrooxidizing producing an assay current;
measuring the assay current at one or more times after the delay period, correlating the one or more assay current measurements to the concentration of glucose in the blood sample, andwithin a period of time from about 4 to about 6 seconds after said detecting, providing a readout of the glucose concentration in the blood sample.
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Abstract
Analytes in a liquid sample are determined by methods utilizing sample volumes of less than about 1.0 μl and test times within about six seconds. The methods are preferably performed using small test strips including a sample receiving chamber filled with the sample by capillary action.
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Citations
26 Claims
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1. A method of determining the concentration of glucose in a blood sample, wherein the blood sample is added to a disposable, electrochemical biosensor test strip comprising:
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providing the disposable, electrochemical biosensor test strip including a capillary chamber having a depth suitable for capillary flow of blood, and holding a volume from about 0.2 to about 0.6 μ
l of the blood sample, and a reagent within the capillary chamber, the reagent including an enzyme and a mediator;applying a blood sample containing glucose into the capillary chamber, the capillary chamber directing capillary flow of the blood sample into contact with the reagent to cause the blood sample to at least partially solubilize or hydrate the reagent, the glucose reacting with the reagent to produce an electroactive reaction product; detecting the blood sample in the capillary chamber; following said detecting, providing a delay period prior to electrooxidizing the electroactive reaction product; following said delay period, electrooxidizing the electroactive reaction product, said electrooxidizing producing an assay current; measuring the assay current at one or more times after the delay period, correlating the one or more assay current measurements to the concentration of glucose in the blood sample, and within a period of time from about 4 to about 6 seconds after said detecting, providing a readout of the glucose concentration in the blood sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. In an electrochemical method for determining the concentration of glucose in a blood sample, the method involving the use of a test strip including a capillary chamber having a depth suitable for capillary flow of blood and a reagent within the capillary chamber, the reagent including an enzyme and a mediator, the method further utilizing a test meter configured to receive and operate the test strip, the method comprising applying a blood sample containing glucose into the capillary chamber, the capillary chamber directing capillary flow of the blood sample into contact with the reagent to cause the blood sample to at least partially solubilize or hydrate the reagent, the glucose in the blood sample reacting with the reagent to produce an electroactive reaction product in an amount which correlates with the amount of glucose in the blood sample, the improvement comprising:
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the capillary chamber holding from about 0.2 to about 0.6 μ
l of the blood sample;detecting the blood sample in the capillary chamber; following said detecting and within a period of time from about 3 seconds to about 5 seconds after said detecting, measuring an electrical current resulting from electrooxidation of the electroactive reaction product; correlating the measured electrical current with the glucose concentration in the blood sample; and within a period of time from about 4 seconds to about 6 seconds after said detecting, providing a readout of the glucose concentration on the test meter. - View Dependent Claims (23, 24, 25, 26)
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Specification