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Assay device with timer function

  • US 20020001852A1
  • Filed: 05/04/2001
  • Published: 01/03/2002
  • Est. Priority Date: 05/05/2000
  • Status: Active Grant
First Claim
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1. An assay device for determining an analyte in an aqueous sample comprising:

  • (i) an elongate flow matrix (6) allowing lateral transport of fluid therethrough by capillary action, wherein said matrix comprises a liquid application zone (3) and downstream thereof, a detection zone (8) having an immobilized capture agent capable of directly or indirectly binding to said analyte, (ii) a wicking member (13) placed at the downstream end of the flow matrix and having an upstream end and a downstream end, and (iii) a time indicator (14) placed downstream of the detection zone (8) for indicating when liquid applied in the liquid application zone has reached the time indicator, wherein the time indicator comprises an indicator substance or substance combination which is capable of exhibiting a visible colour change when hydrated by the aqueous sample, characterized in that the time indicator (14) is arranged in contact with the wicking member (13) at a variable position between the upstream and downstream ends thereof, thereby permitting variation of the time elapsing from the application of the liquid until the indicator substance or substance combination changes colour.

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