A dialysis machine (1； 13) comprising a haemodialysis filter (2), an inlet branch (5) for letting a dialysing solution into said filter (2), an outlet branch (6) for letting the dialysing solution out of said filter (2), an arterial line (3) which is responsible for transport of the blood from a patient (P) to the filter (2), a venous line (4) which is responsible for transport of the blood from the filter (2) to the patient (P), and a plurality of pumps (3a, 9, 10, 16) suitable for circulating both the blood and the dialysing solution. The machine furthermore comprises a haemolysis measuring device (8； 8a； 8b) which is arranged to operate on a line (4； 3； 15) through which the blood or a component thereof flows or on the outlet branch (6) of the dialysing solution.
