An apparatus for controlling a fluid flow rate in a fluid transport line (12, 15, 16) of a medical device, comprising at least a first pump, at least a first chamber (29, 29a) for collecting the fluid, at least a sensor for providing a first value (v1) correlated to the amount of fluid in the first chamber (29, 29a), and a control device (21, 21 a) configured for receiving a second value representative of the fluid flow rate through the first pump (18, 18a) and for correlating the second value with the first value (v1) in order to obtain an accuracy check of the second value. A method for controlling a fluid flow rate in a fluid transport line (12, 15, 16) of a medical device is also disclosed, comprising the steps of pumping a fluid, collecting the fluid in a first chamber (29, 29a), sensing a first value (v1) correlated to the amount of fluid in the first chamber (29, 29a), and detecting and sending a second value representative of the fluid flow rate through the first pump (18, 18a) to a control device (21, 21 a), sending the first value (v1) to the control device (21, 21 a), and correlating the second value with the first value (v1) in order to obtain an accuracy check.
