Methods for detecting an analyte and performing a failsafe step in a body fluid using optical and impedance measurements
First Claim
1. A method for detecting at least one analyte in a body fluid, the method comprising the following steps:
- a) performing an optical measurement, wherein at least one test chemical is contacted with the body fluid, wherein the test chemical is an optical test chemical and is adapted to perform at least one detection reaction in the presence of the analyte, wherein at least one optically detectable property of at least one of the body fluid and the test chemical is changed due to the detection reaction, wherein at least, one optical measurement value is generated;
b) performing at least one impedance measurement, wherein at least two impedance measurement electrodes are used, wherein at least one alternating electrical signal is applied to the body fluid via the impedance measurement electrodes land wherein at least one answer signal is recorded, wherein at least one impedance measurement value is generated;
c) performing at least one evaluation step, wherein, in the evaluation step the optical measurement value and the impedance measurement value are used for detecting the analyte in the body fluid; and
d) performing at least one failsafe step, wherein, in the failsafe step, only the impedance measurement value is used, the failsafe step comprising comparing one or both of a degree of filling of a capillary element and a degree of wetting of a test chemical with at least one threshold value.
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Abstract
A method for detecting at least one analyte in a body fluid is disclosed comprising performing an optical measurement, wherein at least one test chemical is contacts the body fluid. The test chemical is an optical test chemical adapted to perform at least one detection reaction, wherein at least one optically detectable property is changed due to the detection reaction to provide at least one optical measurement value. At least one impedance measurement is generated wherein at least one alternating electrical signal is applied to the body fluid via the impedance measurement electrodes and at least one answer signal is recorded, and at least one impedance measurement value is generated. At least one evaluation step is performed wherein at least one evaluation algorithm is used, and the optical measurement value and the impedance measurement value are used for determining a concentration of the analyte in the body fluid.
34 Citations
15 Claims
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1. A method for detecting at least one analyte in a body fluid, the method comprising the following steps:
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a) performing an optical measurement, wherein at least one test chemical is contacted with the body fluid, wherein the test chemical is an optical test chemical and is adapted to perform at least one detection reaction in the presence of the analyte, wherein at least one optically detectable property of at least one of the body fluid and the test chemical is changed due to the detection reaction, wherein at least, one optical measurement value is generated; b) performing at least one impedance measurement, wherein at least two impedance measurement electrodes are used, wherein at least one alternating electrical signal is applied to the body fluid via the impedance measurement electrodes land wherein at least one answer signal is recorded, wherein at least one impedance measurement value is generated; c) performing at least one evaluation step, wherein, in the evaluation step the optical measurement value and the impedance measurement value are used for detecting the analyte in the body fluid; and d) performing at least one failsafe step, wherein, in the failsafe step, only the impedance measurement value is used, the failsafe step comprising comparing one or both of a degree of filling of a capillary element and a degree of wetting of a test chemical with at least one threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for, detecting the concentration of at least one, analyte in a body fluid, the method comprising:
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a) performing an optical measurement, wherein at least one test chemical is contacted with the body fluid, wherein the test chemical is an optical test chemical and is adapted to, perform at least one detection reaction in the presence of the analyte, wherein at least one optically detectable property of at least one of the body fluid and the test chemical is changed due to the detection reaction, wherein at least one optical measurement value is generated; b) performing at least one impedance measurement, wherein at least two impedance measurement electrodes are used, wherein at least one alternating electrical signal is applied to the body fluid via the impedance measurement electrodes and wherein at least one answer signal is recorded, wherein at least one impedance measurement value is generated; c) performing at least one evaluation step, wherein, in the evaluation step the optical measurement value and the impedance measurement value are used for determining a concentration of the analyte in the body fluid; and d) performing at least one failsafe step, wherein, in the failsafe step, only the impedance measurement value is used, the failsafe step comprising comparing one or both of a degree of filling of a capillary element and a degree of wetting of a test chemical with at least one threshold value. - View Dependent Claims (14, 15)
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Specification