A catheter (1) for measuring temperature of a fluid (2) in a body cavity (10), wherein said catheter (1) comprises a catheter body (100) comprising a proximal end (101) and an opposite distal end (102) comprising a tip (103)； and- an inflow lumen (11)；- an outflow lumen (12)； and- a temperature sensor lumen (13) comprising a temperature sensor (130)； wherein said temperature sensor lumen (13) is arranged closer to said outflow lumen (12) and to said inflow lumen (11) in said catheter body (100)； andwherein said temperature sensor (130) comprises a sensing element (131) positioned at said tip (103) of said distal end (102) to measure a temperature of a fluid (2) in a body cavity (10) when said distal end (102) of said catheter body (100) is inserted into a body cavity (10).
