Systems and methods of discriminating control solution from a physiological sample
First Claim
1. A system for distinguishing between a blood sample and a control solution, the system comprising:
- (a) a test strip including electrical contacts for mating with a test meter and an electrochemical cell comprising;
(i) a first electrode and a second electrode in a spaced apart relationship; and
(ii) a reagent; and
(b) a test meter including a processor programmed to measure and receive current data from the test strip, and data storage containing discrimination criteria for distinguishing a blood sample from a control solution, wherein the discrimination criteria is derived from an interferent index that is representative of antioxidant concentration and a residual reaction index that is representative of reaction kinetics between the reagent and an introduced liquid, in which the processor is programmed to calculate the interferent index based on a summation of current values measured during a first current transient and to determine the residual reaction index by calculating an absolute ratio involving current values obtained during second and third current transients,wherein the interferent index represents a first reference value and the residual reaction index represents a second reference value and in which the processor is further programmed to distinguish a blood sample from a control solution by comparing the calculated second reference value to a pre-determined threshold function based on the interferent index.
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Abstract
Methods for distinguishing between an aqueous non-blood sample (e.g., a control solution) and a blood sample. In one aspect, the methods include using a test strip in which multiple current transients are measured by a meter electrically connected to an electrochemical test strip. The current transients are used to determine if a sample is a blood sample or an aqueous non-blood sample based on at least two characteristics (e.g., amount of interferent present and reaction kinetics). The method can also include calculating a discrimination criteria based upon at least two characteristics. Various aspects of a system for distinguishing between blood samples and an aqueous non-blood sample are also provided herein.
184 Citations
5 Claims
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1. A system for distinguishing between a blood sample and a control solution, the system comprising:
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(a) a test strip including electrical contacts for mating with a test meter and an electrochemical cell comprising; (i) a first electrode and a second electrode in a spaced apart relationship; and (ii) a reagent; and (b) a test meter including a processor programmed to measure and receive current data from the test strip, and data storage containing discrimination criteria for distinguishing a blood sample from a control solution, wherein the discrimination criteria is derived from an interferent index that is representative of antioxidant concentration and a residual reaction index that is representative of reaction kinetics between the reagent and an introduced liquid, in which the processor is programmed to calculate the interferent index based on a summation of current values measured during a first current transient and to determine the residual reaction index by calculating an absolute ratio involving current values obtained during second and third current transients, wherein the interferent index represents a first reference value and the residual reaction index represents a second reference value and in which the processor is further programmed to distinguish a blood sample from a control solution by comparing the calculated second reference value to a pre-determined threshold function based on the interferent index. - View Dependent Claims (2, 3, 4, 5)
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Specification