The invention relates to methods, systems and computer program products for monitoring the biosignals of a test subject, in particular electrocardiograms, wherein a plurality of reference biosignals are recorded along with a respective assigned reference parameter value, a control biosignal is measured, a reference parameter value to be assigned to the control biosignal is determined and, on the basis of the reference parameter value assigned to the control biosignal and on the basis of the plurality of reference parameter values assigned to the plurality of reference biosignals, at least one comparative biosignal is selected from the plurality of stored reference biosignals for comparison, and wherein values of the reference parameter at least partially describe a physiological state of the test subject and/or general conditions of an environment.
