Control solution and method for testing the performance of an electrochemical device for determining the concentration of an analyte in blood
First Claim
1. An aqueous control solution for testing the performance of an electrochemical sensing device useful for determining the concentration of an analyte in a blood sample which device comprises a working electrode and a reference electrode which working electrode has on its surface a composition comprising an enzyme specific for the analyte, a mediator which is a species reduced in response to a reaction between the analyte and the enzyme, and wherein the concentration of the analyte in the fluid test sample is determined as a function of the current measured which passes the working electrode which control solution provides a dynamic current which is distinctly different from the dynamic current profile which would be obtained in the electrochemical sensor with blood.
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Abstract
The present invention relates to a control solution for and a method of testing the performance of an electrochemical sensing device for determining the concentration of an analyte in a blood sample. The device contains a sensing means having a working electrode on which is deposited an enzyme capable of reacting with the analyte to provide electrons and a mediator to shuttle the electrons to the surface of the working electrode. The control solution is formulated so that the device will recognize the control solution as being something other than blood and automatically exclude the results obtained with the control solution from its memory unit.
316 Citations
18 Claims
- 1. An aqueous control solution for testing the performance of an electrochemical sensing device useful for determining the concentration of an analyte in a blood sample which device comprises a working electrode and a reference electrode which working electrode has on its surface a composition comprising an enzyme specific for the analyte, a mediator which is a species reduced in response to a reaction between the analyte and the enzyme, and wherein the concentration of the analyte in the fluid test sample is determined as a function of the current measured which passes the working electrode which control solution provides a dynamic current which is distinctly different from the dynamic current profile which would be obtained in the electrochemical sensor with blood.
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11. A method for testing the performance of an electrochemical sensing device for determining the concentration of an analyte in a blood sample which device comprises a meter and electrochemical sensing means wherein the method comprises the steps of:
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a) providing the electrochemical sensing device having a sensing means which includes a working electrode and a reference electrode which working electrode has on its surface a composition comprising an enzyme specific for the analyte and a partially reduced mediator which is a species reduced in response to a reaction between the analyte and the enzyme; b) placing a control solution between the working electrode and the reference electrode of the sensing means which control solution is capable of electrically connecting these electrodes and which control solution contains a known concentration of the analyte and provides a dynamic current profile which is distinctly different than that which is provided by a blood sample under similar conditions; c) applying a potential between the electrodes to return at least a portion of the mediator back to its oxidized form to provide a measurable burn current which current is measured; d) terminating the potential applied to the electrodes to provide an open circuit for a set delay period; e) applying a second voltage between the electrodes and measuring the current in the control solution to provide a read current and measuring the read current; and f) determining the dynamic current profile of the control solution in terms of the ratio of read current to burn current which dynamic current profile is distinctly different from the dynamic current profile which would be obtained with a blood sample. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification