A haemodialysis machine comprising: a haematic circuit provided with a dialyser filter and one or more ducts that are connected to said dialyser filter and are designed to allow respective liquids to pass there through, and a measurement system provided with a measurement circuit comprising one or more heat-resistive components associated with respective ducts, the machine for haemodialysis being characterised in that said measurement system is configured to: supply said measurement circuit with an electric current (Is(t)) having an alternation of first and second pre-set current values; said first current values being sized so that said heat-resistive components transmit a first quantity of negligible minimum heat towards the liquid that passes through the relative duct, said second current values being sized so that said heat-resistive components transmit a second quantity of heat significantly greater than said first quantity of heat, towards the liquid that passes through the relative duct; determine at least a first resistive value (RdL) and a second resistive value (RdH) indicative of resistance variation on said at least one heat-resistive component caused by said alternation of first and respectively, second current values; determine at least one differential resistive value (Rd) indicative of said resistance variation based on the difference between said second resistive value (RdH) and said first resistive value (RdL); determine the flowrate of a liquid passing through said duct and/or the flowrate differential (ΔQ) of the liquid between the flowrate of said liquid and the flowrate of a liquid passing through another duct, based on said differential resistive value (Rd). a haematic circuit provided with a dialyser filter and one or more ducts that are connected to said dialyser filter and are designed to allow respective liquids to pass there through, and a measurement system provided with a measurement circuit comprising one or more heat-resistive components associated with respective ducts, the machine for haemodialysis being characterised in that said measurement system is configured to: supply said measurement circuit with an electric current (Is(t)) having an alternation of first and second pre-set current values; said first current values being sized so that said heat-resistive components transmit a first quantity of negligible minimum heat towards the liquid that passes through the relative duct, said second current values being sized so that said heat-resistive components transmit a second quantity of heat significantly greater than said first quantity of heat, towards the liquid that passes through the relative duct; determine at least a first resistive value (RdL) and a second resistive value (RdH) indicative of resistance variation on said at least one heat-resistive component caused by said alternation of first and respectively, second current values; determine at least one differential resistive value (Rd) indicative of said resistance variation based on the difference between said second resistive value (RdH) and said first resistive value (RdL); determine the flowrate of a liquid passing through said duct and/or the flowrate differential (ΔQ) of the liquid between the flowrate of said liquid and the flowrate of a liquid passing through another duct, based on said differential resistive value (Rd). supply said measurement circuit with an electric current (Is(t)) having an alternation of first and second pre-set current values; said first current values being sized so that said heat-resistive components transmit a first quantity of negligible minimum heat towards the liquid that passes through the relative duct, said second current values being sized so that said heat-resistive components transmit a second quantity of heat significantly greater than said first quantity of heat, towards the liquid that passes through the relative duct; determine at least a first resistive value (RdL) and a second resistive value (RdH) indicative of resistance variation on said at least one heat-resistive component caused by said alternation of first and respectively, second current values; determine at least one differential resistive value (Rd) indicative of said resistance variation based on the difference between said second resistive value (RdH) and said first resistive value (RdL); determine the flowrate of a liquid passing through said duct and/or the flowrate differential (ΔQ) of the liquid between the flowrate of said liquid and the flowrate of a liquid passing through another duct, based on said differential resistive value (Rd).