Patent ID: 8193002

Claim:
An analytical test device for detecting an analyte suspected of being present in a liquid sample applied to the device, the device comprising a test strip, the test strip comprising a sample application area; a mobilisable labeled specific binding reagent which binds the analyte if present in the liquid sample; a test result zone located downstream of the sample application area, the test result zone comprising an immobilized specific binding reagent which binds the analyte; and a control zone located downstream of the test result zone, the control zone comprising a visible barrier and mobilisable control dye, wherein the mobilisable control dye is covered by the visible barrier and not visible to a user when the test strip is in a dry state, and wherein the mobilisable control dye becomes visible to a user when the liquid sample contacts the control zone and the mobilisable control dye is mobilized and moves downstream of the visible barrier.