Disclosed is a test device and a method for qualitatively and/or quantitatively measuring the concentration of an analyte in a biological fluid sample. The test device includes a housing defining a sample port, a test well containing a stirrer and a conjugate, and a test strip disposed within the housing. The test well is also defined by being located between the sample port and the test strip. Fluid flows from the test well onto the test strip, which has a trapping zone which binds the analyte and allows for its detection. A control zone may also be included. The test device is generally adapted to use a sandwich assay. Also disclosed is a system comprising the test device and a signal sensing device; and a method for using the test device.