A sensor for sensing analytes in blood comprising
plasma and erythrocytes, the sensor comprising: an
analyte sensor configured to sense an
analyte in the blood and to output a response corresponding to the sensed
analyte; and a separation device adapted to mutually separate the
plasma and the erythrocytes, for assessing a
haemolysis level of the blood based on a colour and / or a
fluorescence of the separated
plasma.