The invention provides a toilet arrangement for a urodynamic measurement, the toilet arrangement comprising: a bowl unit with a bowl unit outlet a weigh unit comprising: (i) a receptor comprising (a) a receptor opening in fluid contact with the bowl unit outlet but not in direct physical contact with the bowl unit outlet and (b) a receptor outlet (ii) a pump unit comprising (a) a pump unit inlet in fluid contact with the receptor outlet, (b) a shredder in fluid contact with the receptor outlet, and (c) a pump unit outlet (iii) a load cell configured to weigh the receptor and the pump unit and to provide a corresponding load cell signal and a control unit configured to detect the load cell signal as function of time.
