System and method for measuring an analyte in a sample
First Claim
1. A method of calculating an analyte concentration of a sample, comprising:
- introducing a sample to an electrochemical cell that includes a first electrode and a second electrode;
applying a first test voltage V1 for a first time interval T1 between the first electrode and the second electrode sufficient to at least partially oxidize a reduced mediator at the second electrode;
applying a second test voltage V2 for a second time interval T2 between the first electrode and the second electrode sufficient to at least partially oxidize the reduced mediator at the first electrode;
calculating an initial analyte concentration of the sample based on at least one test current value determined during the first time interval T1 and the second time interval T2;
calculating an error source of the sample; and
calculating a corrected analyte concentration based on the initial analyte concentration and the error source;
wherein the analyte includes glucose and the error source includes a hematocrit level H of the sample, the calculating steps being calculating an initial glucose concentration G1 of the sample based on at least one test current value determined during the first time interval T1 and the second time interval T2, calculating the hematocrit level H of the sample, and calculating a corrected glucose concentration G2 based on the initial glucose concentration G1 and the hematocrit level H.
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Abstract
Methods of determining a corrected analyte concentration in view of some error source are provided herein. The methods can be utilized for the determination of various analytes and/or various sources of error. In one example, the method can be configured to determine a corrected glucose concentration in view of an extreme level of hematocrit found within the sample. In other embodiments, methods are provided for identifying various system errors and/or defects. For example, such errors can include partial-fill or double-fill situations, high track resistance, and/or sample leakage. Systems are also provided for determining a corrected analyte concentration and/or detecting some system error.
181 Citations
25 Claims
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1. A method of calculating an analyte concentration of a sample, comprising:
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introducing a sample to an electrochemical cell that includes a first electrode and a second electrode; applying a first test voltage V1 for a first time interval T1 between the first electrode and the second electrode sufficient to at least partially oxidize a reduced mediator at the second electrode; applying a second test voltage V2 for a second time interval T2 between the first electrode and the second electrode sufficient to at least partially oxidize the reduced mediator at the first electrode; calculating an initial analyte concentration of the sample based on at least one test current value determined during the first time interval T1 and the second time interval T2; calculating an error source of the sample; and calculating a corrected analyte concentration based on the initial analyte concentration and the error source; wherein the analyte includes glucose and the error source includes a hematocrit level H of the sample, the calculating steps being calculating an initial glucose concentration G1 of the sample based on at least one test current value determined during the first time interval T1 and the second time interval T2, calculating the hematocrit level H of the sample, and calculating a corrected glucose concentration G2 based on the initial glucose concentration G1 and the hematocrit level H. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21)
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18. A system for determining an analyte concentration, comprising:
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an electrochemical cell having at least two electrodes and being sized and configured to receive a sample, the electrochemical cell further configured to determine an initial analyte concentration and also configured to generate a pre-determined voltage between the first and second electrodes for a pre-determined amount of time, and further configured to measure at least one resulting current of the sample during the pre-determined time; and a processor for receiving a set of data from the electrochemical cell, the data including the initial analyte concentration, at least one applied voltage, and at least one resulting current, the processor further configured to utilize this data to determine a corrected analyte concentration, wherein the analyte includes glucose, the electrochemical cell is further configured to calculate a hematocrit level, and the processor receives the calculated hematocrit level, determines a correction term based on the calculated hematocrit level and the initial glucose concentration, and utilizes the correction term as data used to determine the corrected analyte concentration. - View Dependent Claims (22, 23)
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19. A device for use in determining a corrected analyte concentration, comprising:
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a test strip having a sample reaction chamber configured to receive a sample such that the sample is in communication with at least first and second electrodes; and a reagent layer disposed on at least one electrode, the reagent layer formed of at least one component configured to react with the sample such that at least two voltages applied to the sample at least two time intervals results in corresponding currents within the sample which are indicative of an initial analyte concentration and a corrected analyte concentration, wherein the analyte includes glucose and the corrected analyte concentration is calculated based on a calculated hematocrit level of the sample and the initial glucose concentration of the sample. - View Dependent Claims (24, 25)
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Specification