A toilet seat apparatus is disclosed herein which, in some embodiments, includes a cavity, an acoustic transducer, orifices, and an impedance matching substance dispenser. The dispenser may include a reservoir, a conduit, and a pump. The reservoir dispenses an impedance matching substance may be connected to the conduit and pump. The toilet seat apparatus performs ultrasound analyses of a user seated on the toilet. The impedance matching substance may be what is known as ultrasound gel which improves conduction during the acoustic transduction of an ultrasound analysis. This apparatus permits a user to receive an ultrasound analysis of the thigh, including automatically dispensing the ultrasound gel, while seated on a toilet seat.