Read-out method and apparatus
First Claim
1. A method for detecting the presence and/or amount of an analyte in a sample by obtaining a reliable read-out from a composite signal represented by a coloured area on a test member, the colour being obtained as a response to the analyte, the method comprising:
- providing as said test member a read-out substrate in the form of a bibulous strip having at least one response area and at least one marker on said response area, the marker causing a colour change when the analyte in the sample undergoes a reaction;
applying a liquid sample, blood, plasma, or any other suitable liquid containing an analyte, on said strip, whereby said sample is caused to migrate by capillary forces along the strip, and undergoes a reaction at predefined locations on said strip;
illuminating the assay strip;
recording an image of said strip;
calculating a colour saturation value S for said image using said at least two wavelength ranges;
the S-value being calculated as
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Accused Products
Abstract
A read-out method for a diagnostic point-of-care assay device, the device including a read-out substrate having at least one response area capable of producing a colored indication of a response, the response area including a marker at least one marker whose color changes in response to binding of an analyte thereto and which is used for indication of response. The method includes registering an image of the response area; calculating a color saturation value S for the image using at least two distinct wavelengths; using the S-value for determining a result of the assay. A read-out system (10) for an allergy point-of-care assay device is described. The system includes an illumination device (12; 21, 22) capable of delivering at least two different wavelengths of light; a color image capturing device (14); a control unit (19) for calculating a color saturation value on images recorded by the color image capturing device.
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Citations
10 Claims
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1. A method for detecting the presence and/or amount of an analyte in a sample by obtaining a reliable read-out from a composite signal represented by a coloured area on a test member, the colour being obtained as a response to the analyte, the method comprising:
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providing as said test member a read-out substrate in the form of a bibulous strip having at least one response area and at least one marker on said response area, the marker causing a colour change when the analyte in the sample undergoes a reaction; applying a liquid sample, blood, plasma, or any other suitable liquid containing an analyte, on said strip, whereby said sample is caused to migrate by capillary forces along the strip, and undergoes a reaction at predefined locations on said strip; illuminating the assay strip; recording an image of said strip; calculating a colour saturation value S for said image using said at least two wavelength ranges;
the S-value being calculated as - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A read-out system (10) for an allergy point-of-care assay device (17, 18), using colour change on a test member as an indication of presence or absence of an analyte, the system comprising:
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an illumination device (12;
21, 22) capable of delivering at least two different wavelengths of light;a colour image capturing device (14); and a control unit (19) for calculating a colour saturation value (S) on images recorded by the colour image capturing device, the control unit being adapted to calculate the S-value as - View Dependent Claims (9, 10)
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Specification