Abstract: A method for the detection of analytes within a fluid, said method comprising the steps of prearranging a sensorized device (100) comprising at least one SAW sensor (110), said or each SAW sensor (110) comprising a substrate (115) having an outer surface (IIS?) comprising at least one piezoelectric portion, at least one emitting interdigital transducer (111) arranged on said piezoelectric portion of said outer surface (115?), said emitting interdigital transducer (111) arranged to emit a surface acoustic wave in response to an input electric signal, at least one reflector electrode (112) arranged on said outer surface (115?), said reflector electrode (112) arranged to reflect said acoustic wave towards said emitting interdigital transducer (111).