Method and apparatus for detecting analyte with filter

Abstract

To detect an analyte, a fluid is flown through a filter. The fluid carries signal producing members smaller in size than the analyte and having affinity to specifically attach to the analyte. The filter is adapted for trapping the analyte while allowing passage of unattached ones of the signal producing members. A signal produced by one or more of the signal producing members can be sensed upstream of the filter to detect the analyte trapped by the filter.