Methods for detecting and quantifying an analyte employ a pair of proximity probes, each comprising a proteinaceous target-binding domain coupled to a nucleic acid domain (NAD), which NADs interact when the proximity probes have bound in proximity to their respective target; and a set of markers, wherein each marker is a nucleic acid molecule comprising a binding domain and a reporter domain giving a detectable signal, can interact with said NADs to form a nucleic acid molecule from which a detectable signal is generated, or with a nucleic acid molecule generated by interaction of said NADs, cannot interact with said NADs simultaneously with another marker in the set, generates a signal that is distinguishable from another marker signal, and is present in an amount capable of detecting analyte at a range of concentrations differing from the range of concentrations detectable by other markers.