The present invention relates to a device for visual detection of hemolysis in a whole blood sample, comprising at least one visible detection compartment and a transfer passage connected to said visible detection compartment, said transfer passage being arranged to permit transfer of a volume of plasma from said sample to said detection compartment and wherein said transfer passage further is arranged with a separation device (4) for separating plasma from blood cells within said whole blood sample before said plasma reaches the detection compartment, wherein said device is arranged with subpressure means providing a subpressure inside said detection compartment for generating a force urging said volume of plasma to be transferred from said whole blood sample to said detection compartment through said transfer passage and via said separation device.
