A method is provided to determine the presence of an analyte in a sample.
The method provides an element with a sample application zone, a
detection zone, a zone containing immobilized analyte or analyte
analogue, a conjugate that has a first bioaffine binding partner capable
of a specific binding reaction with the analyte and a first detectable
label, and a universal conjugate, which can be detached by liquid and
comprises a second bioaffine binding partner and a visually detectable
label. The second bioaffine binding partner is capable of a specific
binding reaction with the first detectable label. The method also
includes contacting the sample application zone with the sample,
contacting the sample with the conjugate and the universal conjugate to
react the analyte with the and the universal conjugate to form a
detection complex, and determining the presence of the detection complex
in the detection zone of the element.