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Body fluid analyte measurement

  • US 6,809,807 B1
  • Filed: 03/09/1999
  • Issued: 10/26/2004
  • Est. Priority Date: 03/09/1999
  • Status: Expired due to Term
First Claim
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1. A method for testing for an analyte in a sample having both the analyte and other constituents where the analyte has an absorption peak over a narrow bandwidth at a characteristic wavelength and where the other constituents have an absorption of a broad bandwidth and where the broad bandwidth includes and is broader than the narrow bandwidth, the method comprising:

  • directing a radiant energy at the sample with a source bandwidth broader than and including the broad bandwidth which includes the narrow bandwidth, wherein a portion of the energy is absorbed by the sample and wherein a remainder of the energy is available for analysis;

    analyzing the remainder of the energy by optically filtering the remainder into an analyte portion containing substantially only the narrow bandwidth and a reference portion containing substantially the broad bandwidth and said narrow bandwidth; and

    measuring and comparing the analyte portion and the reference portion to calculate an amount of the analyte in the sample.

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