Progressive approximation of sample analyte concentration
First Claim
1. A method for determining an analyte concentration in a sample using a biosensor, comprising:
- generating at least two analyte responsive output signals from a sample;
measuring the two analyte responsive output signals from the sample;
determining at least two initial analyte concentrations from the two analyte responsive output signals;
determining a first pseudo-reference concentration from the two analyte responsive output signals, the first pseudo-reference concentration being a first substitute for true relative error;
determining at least two first anchor parameters in response to the first pseudo-reference concentration, the two first anchor parameters compensating for system error, at least one of the two first anchor parameters being a first channel signal-based anchor parameter determined in response to a first normalized output signal and a pseudo-reference signal, the first channel signal-based anchor parameter=(NROSV1−
NRPseudo)/NRPseudo, NROSV1 being a first normalized output signal value and NRPseudo being a pseudo-reference signal;
incorporating the two first anchor parameters into at least two first compensation relationships, at least one of the two first compensation relationships including Ach1_comp=Ach1initial/(1+RECh1), Ch1 being channel 1, Ach1_comp being the anchor parameter compensated analyte concentration determined for channel 1, Ach1 initial being the initial analyte concentration determined for channel 1;
determining at least two first anchor compensated analyte concentrations in response to the two initial analyte concentrations, the two first anchor parameters, and the two first compensation relationships;
determining a second pseudo-reference concentration by averaging the two first anchor compensated analyte concentrations, the second pseudo-reference concentration being a second substitute for true relative error; and
reporting the second pseudo-reference concentration as a final compensated analyte concentration of the sample.
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Accused Products
Abstract
Error may be introduced into an analysis by both the biosensor system used to perform the analysis and by errors in the output signal measured by the measurement device of the biosensor. For a reference sample, system error may be determined through the determination of relative error. However, during an analysis of a test sample with the measurement device of the biosensor system, true relative error cannot be known. A pseudo-reference concentration determined during the analysis may be used as a substitute for true relative error. The closer the analysis-determined pseudo-reference analyte concentration is to the reference analyte concentration of the test sample, the more accurate and/or precise the analyte concentration determined by the measurement device using an anchor parameter during compensation. The present invention provides an improvement in the accuracy and/or precision of the analysis determined pseudo-reference concentration through progressive approximation.
9 Citations
20 Claims
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1. A method for determining an analyte concentration in a sample using a biosensor, comprising:
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generating at least two analyte responsive output signals from a sample; measuring the two analyte responsive output signals from the sample; determining at least two initial analyte concentrations from the two analyte responsive output signals; determining a first pseudo-reference concentration from the two analyte responsive output signals, the first pseudo-reference concentration being a first substitute for true relative error; determining at least two first anchor parameters in response to the first pseudo-reference concentration, the two first anchor parameters compensating for system error, at least one of the two first anchor parameters being a first channel signal-based anchor parameter determined in response to a first normalized output signal and a pseudo-reference signal, the first channel signal-based anchor parameter=(NROSV1−
NRPseudo)/NRPseudo, NROSV1 being a first normalized output signal value and NRPseudo being a pseudo-reference signal;incorporating the two first anchor parameters into at least two first compensation relationships, at least one of the two first compensation relationships including Ach1_comp=Ach1initial/(1+RECh1), Ch1 being channel 1, Ach1_comp being the anchor parameter compensated analyte concentration determined for channel 1, Ach1 initial being the initial analyte concentration determined for channel 1; determining at least two first anchor compensated analyte concentrations in response to the two initial analyte concentrations, the two first anchor parameters, and the two first compensation relationships; determining a second pseudo-reference concentration by averaging the two first anchor compensated analyte concentrations, the second pseudo-reference concentration being a second substitute for true relative error; and reporting the second pseudo-reference concentration as a final compensated analyte concentration of the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A biosensor system for determining an analyte concentration in a sample, comprising:
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a test sensor having a sample interface adjacent to a reservoir formed by a base, where the test sensor is capable of generating at least two analyte responsive output signals from a sample; and a measurement device having a processor connected to a sensor interface, the sensor interface having electrical communication with the sample interface, and the processor having electrical communication with a storage medium; wherein the processor is capable of measuring the two analyte responsive output signals from the sample; wherein the processor is capable of determining at least two initial analyte concentrations from the two analyte responsive output signals; wherein the processor is capable of determining a first pseudo-reference concentration from the two analyte responsive output signals, the first pseudo-reference concentration being a first substitute for true relative error; wherein the processor is capable of determining at least two first anchor parameters in response to the first pseudo-reference concentration, the two first anchor parameters compensating for system error, at least one of the two first anchor parameters being a first channel signal-based anchor parameter determined in response to a first normalized output signal and a pseudo-reference signal, the first channel signal-based anchor parameter=(NROSV1−
NRPseudo)/NRPseudo, NROSV1 being a first normalized output signal value and NRPseudo being a pseudo-reference signal;wherein the processor is capable of incorporating the two first anchor parameters into at least two first compensation relationships, at least one of the two first compensation relationships including Ach1_comp=Ach1initial/(1+RECh1), Ch1 being channel 1, Ach1_comp being the anchor parameter compensated analyte concentration determined for channel 1, Ach1 initial being the initial analyte concentration determined for channel 1; wherein the processor is capable of determining at least two first anchor compensated analyte concentrations in response to the two initial analyte concentrations, the two first anchor parameters, and the two first compensation relationships; wherein the processor is capable of determining a second pseudo-reference concentration by averaging the two first anchor compensated analyte concentrations, the second pseudo-reference concentration being a second substitute for true relative error; and wherein the processor is capable of reporting the second pseudo-reference concentration as a final compensated analyte concentration of the sample. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A biosensor system for determining an analyte concentration in a sample, comprising:
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a test sensor having a sample interface adjacent to a reservoir formed by a base, where the test sensor is capable of generating at least two analyte responsive output signals from a sample; and a measurement device having a processor connected to a sensor interface, the sensor interface having electrical communication with the sample interface, and the processor having electrical communication with a storage medium; wherein the processor is capable of measuring the two analyte responsive output signals from the sample; wherein the processor is capable of determining at least two initial analyte concentrations from the two analyte responsive output signals; wherein the processor is capable of determining a first pseudo-reference concentration from the two analyte responsive output signals, the first pseudo-reference concentration being a first substitute for true relative error; wherein the processor is capable of determining at least two first anchor parameters in response to the first pseudo-reference concentration, the two first anchor parameters compensating for system error; wherein the processor is capable of incorporating the two first anchor parameters into at least two first compensation relationships; wherein the processor is capable of determining at least two first anchor compensated analyte concentrations in response to the two initial analyte concentrations, the two first anchor parameters, and the two first compensation relationships; wherein the processor is capable of determining a second pseudo-reference concentration by averaging the two first anchor compensated analyte concentrations, the second pseudo-reference concentration being a second substitute for true relative error; wherein the processor is capable of determining a third pseudo-reference concentration by selecting a sample analyte concentration value as the pseudo-reference concentration; wherein the sample analyte concentration value for multiple analyses is on average closer to an actual analyte concentration of the sample than would be independently determined from the two analyte responsive output signals; and wherein the processor is capable of reporting the third pseudo-reference concentration as a final compensated analyte concentration of the sample.
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Specification