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Flow sensing for determination of assay results

  • US 20050037511A1
  • Filed: 12/19/2003
  • Published: 02/17/2005
  • Est. Priority Date: 06/04/2003
  • Status: Active Grant
First Claim
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1. An assay result reading device for reading the result of an assay performed using a liquid transport carrier, the device comprising:

  • at least one light source capable of emitting light incident upon at least one of two or more spatially separated zones of the carrier;

    a photodetector so positioned as to be capable of detecting light emanating from each of the two said zones and generating signals representing the presence or absence of a fluid sample in the respective zone; and

    a computation circuit responsive to the signals to;

    calculate a flow rate for a fluid flowing along the carrier;

    compare the calculated flow rate to upper and lower limits; and

    reject the assay result if the calculated flow rate is outside the upper and lower limits.

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