Systems and methods for determining a substantially hematocrit independent analyte concentration
First Claim
1. A method of detecting the presence of sufficient quantity of a fluid sample deposited on a test strip having a reference electrode and a working electrode, in which the working electrode is coated with a reagent layer, the method comprising:
- applying a forward test voltage between the reference electrode and the working electrode and measuring a forward current value near the end of the forward test voltage, in which the forward test voltage is from about 100 millivolts to about 600 millivolts;
applying a reverse test voltage of opposite polarity and substantially equal magnitude to the forward test voltage between the reference electrode and the working electrode and measuring a reverse current value near the end of the reverse test voltage, the reverse test voltage being from about negative 100 millivolts to about negative 600 millivolts;
calculating a ratio of the reverse current value to the forward current value; and
determining if the ratio of the reverse current value to the forward current value is within an acceptance range, the acceptance range being substantially equal to two when the reference electrode is about twice the surface area of the working electrode; and
detecting the presence of sufficient quantity of the fluid sample based on the ratio.
7 Assignments
0 Petitions
Accused Products
Abstract
A method and system is provided to allow for determination of substantially Hematocrit independent analyte concentration. In one example, an analyte measurement system is provided that includes a test strip and a test meter. The test strip includes a reference electrode and a working electrode, in which the working electrode is coated with a reagent layer. The test meter includes an electronic circuit and a signal processor. The electronic circuit applies a plurality of voltages to the reference electrode and the working electrode over respective durations. The signal processor is configured to determine a substantially hematocrit-independent concentration of the analyte from a plurality of current values as measured by the processor upon application of a plurality of test voltages to the reference and working electrodes over a plurality of durations interspersed with rest voltages lower than the test voltages being applied to the electrodes.
21 Citations
7 Claims
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1. A method of detecting the presence of sufficient quantity of a fluid sample deposited on a test strip having a reference electrode and a working electrode, in which the working electrode is coated with a reagent layer, the method comprising:
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applying a forward test voltage between the reference electrode and the working electrode and measuring a forward current value near the end of the forward test voltage, in which the forward test voltage is from about 100 millivolts to about 600 millivolts; applying a reverse test voltage of opposite polarity and substantially equal magnitude to the forward test voltage between the reference electrode and the working electrode and measuring a reverse current value near the end of the reverse test voltage, the reverse test voltage being from about negative 100 millivolts to about negative 600 millivolts; calculating a ratio of the reverse current value to the forward current value; and determining if the ratio of the reverse current value to the forward current value is within an acceptance range, the acceptance range being substantially equal to two when the reference electrode is about twice the surface area of the working electrode; and detecting the presence of sufficient quantity of the fluid sample based on the ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification