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Method and test strip for determining a fluid analyte

  • US 7,439,033 B2
  • Filed: 01/29/2004
  • Issued: 10/21/2008
  • Est. Priority Date: 02/04/2003
  • Status: Active Grant
First Claim
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1. A method for determining analyte concentration in a fluid sample, the method comprising the acts of:

  • (a) providing a test strip having a sample side and a reaction side, the test strip including a porous membrane, the test strip being adapted to accept a sample on the sample side and pass it towards the reaction side, said test strip including a testing reagent, said testing reagent comprising a color indicator system that changes color to indicate the presence of the analyte in the sample, said test strip further having a polymer on at least the reaction side, said polymer increasing the opacity of at least a portion of the test strip after contact with a sample, said polymer being selected from the group consisting of acrylic latex polymers, polystyrene sodium sulfate polymers, and combinations thereof;

    (b) applying the sample to the sample side of the test strip; and

    (c) measuring the change in color of the testing side to determine the analyte concentration of the sample.

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