1. An implantable medical device capable of detecting presence of noise, said device being connectable to an electrode arrangement comprising a plurality of electrodes adapted to define one or more measurement vectors, each having a noise pick-up region, said device comprising: a voltage measuring device adapted to measure a voltage; a control module adapted to cause the voltage measuring device to measure at least one voltage over each of at least two measurement vectors, wherein the at least two measurement vectors have different noise pick-up regions; a calculation unit adapted to: calculate at least one noise parameter for each measurement vector based on the measured at least one voltage for respective measurement vector; and calculate at least one relation between a respective noise parameter of two measurement vectors; and a noise detecting unit adapted to: compare the at least one relation with at least one corresponding predetermined reference relation; and if the at least one relation exceeds the at least one corresponding reference relation, detect that noise that may disturb a subsequent impedance measurement is present.