An apparatus for measuring the flow rate of urine, including an encasement, configured to encase components of the apparatus； a receptacle bowl attached to the encasement, configured to be placed over a toilet bowl or seat, and direct fluid through a single point of exit to a fluid flow guide； the fluid flow guide, configured to transfer fluid from the receptacle bowl to an impeller； the impeller, configured to rotate along a rotation axis, wherein the impeller includes a plurality of blades, configured to receive the urine from the flow guide, and thereby rotate the impeller at a speed correlating with the flow rate of the urine； and an angular velocity sensor, configured to produce electric signals that correlate with the angular velocity or angular position of the impeller.
