A method, a test element (50) and a device (190) fordetermining at least one concentration of at least oneanalyte in a sample (110) are described, moreparticularly for detecting at least one metabolite in asample (110) of a body fluid, wherein at least one testelement (50) having at least one test chemistry (102)is used, wherein at least one reaction of the testchemistry (102) with the analyte is detected.Additionally, at least one label (104, 104') is used,wherein the label (104, 104') is different from theanalyte (117), wherein at least one diffusion of thelabel (104, 104') in the sample (110) or at least oneconstituent of the sample (110) is detected. At leastone piece of correction information is generated fromthe diffusion of the label (104, 104'), wherein theconcentration of the analyte is determined from thereaction of the test chemistry (102) with the analytewhile taking into account the piece of correctioninformation.
