Visually-readable reagent test strip
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United States of America Patent
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Dec 1, 1998
Issued Date -
N/A
app pub date -
Dec 31, 1996
filing date -
May 15, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multilayer reagent test strip measures the concentration of analyte in a liquid sample that is applied to it. The sample is guided to a number of assay areas arrayed along the strip, where the analyte can react with a reagent to cause a color change. Each assay area also includes an inhibitor for the color-change reaction. The inhibitor concentration increases in successive assay areas; thus, the number of areas that change color is a measure of the analyte concentration. The test strip is particularly adapted for measuring glucose in a whole blood sample. In a preferred embodiment, the sample is guided to the assay areas along a path formed by crushing selected areas of a membrane, and the assay areas are uncrushed areas of the membrane.
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