Binding assay

A binding assay product for detecting the presence of an analyte in a sample comprising:

• a labelling module comprising at least one first binding component capable of binding the analyte;
• a label connectable to the first binding component;
• a capture module comprising at least one second binding component capable of binding the analyte;
• and
• a visualisation module for detecting the first binding component connected to the label and bound to the second binding component via the analyte, wherein the capture, labelling and visualisation modules are independent modules and are interchangeably connectable with each other, wherein at least the labelling module and the capture module each comprise a fluid conducting medium comprising an open-porous structure in which the first and second binding components are embedded, and the labelling module, the capture module and the visualisation module together define a flow path, along which a sample is capable of flowing, and wherein the binding assay product further comprises at least one barrier along the flow path, the barrier carrying an assay reagent and being capable of delaying the progress of the sample along the flow path.