The invention relates to a method for the detection and/or measurement of a phenol comprising: (a) contacting the sample to be tested with a polymer imprinted with the phenol or an analogue thereof; and (b) measuring binding of the phenol to the polymer. The polymer may be prepared by polymerising a polymerisable monomer, to which a phenol is covalently bound by a hydrolysable linker, and subsequently removing the phenol by hydrolysis. Propofol is a preferred phenol for use in the invention.