Sample discriminating method

• US 20040235178A1
• Filed: 06/29/2004
• Published: 11/25/2004
• Est. Priority Date: 11/29/1999
• Status: Active Grant

• Current Assignee: PHC Corporation (PHC Holdings Corporation)
• Original Assignee: ARKRAY, Inc, Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Iketaki, Kazuo, Baba, Hideyuki, Tokunaga, Hiroyuki, Miyazaki, Shoji, Hamamoto, Katsumi, Inoue, Yoichi
• Granted Patent: US 7,122,111 B2
• Time in Patent Office: Days
• US Class Current: 436/43
• CPC Class Codes: G01N 27/3274 Corrective measures, e.g. error detection, compensation for temperature or hematocrit, calibration coding of calibration information G01N33/48771
• CPC Class Codes: Y10T 436/11 Automated chemical analysis

Abstract

A glucose sensor system comprising the steps of using as a sample discriminating parameter a ratio (I/ΔI) of a measured current value I to the time-differential value of the current value ΔI, defining a discrimination function that discriminates whether a sample is blood or control fluid and uses the discriminating parameter as an independent variable, quantitating as a discriminating index a numeric value obtained by substituting a discriminating parameter value into this discrimination function, and automatically discriminating, based on this index, whether the sample is blood or a control fluid, whereby a kind of the sample can be automatically quantitated by measuring electric current when a sensor system is used for quantitating the concentration of an analysis object in the sample.

Claims

1. A method of discriminating a sample for a sensor system which quantitates the concentration of a target substance contained in the sample by measuring electric current, said method comprising the steps of:

using a ratio of a measured current value to a time-differential value of the current value as a discriminating parameter;

defining a discrimination function for discriminating kinds of a plurality of objective samples using a plurality of said discriminating parameters, said discrimination function using said discriminating parameters as independent variables, and said independent variables being multiplied by respective constants which are different from one another;

using a numeric value obtained by substituting the values of said discriminating parameters into said discrimination function, as a discriminating index; and

discriminating the kind of any sample based on said discriminating index.

2. The method according to claim 1, wherein said discrimination function is defined by means of an expression using said discriminating parameters.

3. The method according to claim 1, wherein said discrimination function is defined by means of a linear expression for said discriminating parameters.

4. The method according to claim 1, wherein said discrimination function is defined by means of an expression of high degree for said discriminating parameters.

5. The method according to claim 1, wherein the kinds of the samples to be discriminated are a body fluid and a control fluid.

6. The method according to claim 5, wherein said sensor system is judged whether it is right or not based on a quantitated value of the concentration of the target substance contained in the control fluid, and then a resultant judgment is indicated.

7. The method according to claim 1, wherein when the value of said discriminating index is within a predetermined range that it is difficult to discriminate the kind of the sample, the kind of the sample is not discriminated while the purport is indicated.