Patent ID: 8026716

Claim:
Device for the qualitative or quantitative measurement of a magnetically labelled analyte, which device includes a coil arrangement, formed of at least one measuring coil and a reference coil arranged in connection with it, for measuring the analyte from a sample absorbed in a test base, and from the intermediate output signal of which coil arrangement a change in inductance correlating to the content of the magnetically labelled analyte is arranged to be detected, characterized in that the said change in inductance is arranged to be detected from a change (ΔA, Δφ) in amplitude and/or phase appearing in the output signal measured from the intermediate output of the coil arrangement, which is arranged to be measured at the frequency of the input signal and the device includes in addition a coil arrangement compensating error signals, for example, for compensating error signals caused by the environment and/or magnetic particles bound unspecifically to the test base.