The invention is directed to a system and process for estimating a core body temperature of a human subject. The system includes mount, a body, and a heat trap having a temperature sensor. The mount is operable to secure the device to a toilet or adjacent surface. The body houses a microprocessor. The heat trap is distal to the body and is shaped to receive a liquid stream and contain the thermal energy therein. The heat trap comprises a low thermally conductive material. The temperature sensor is in communication with the microprocessor. The temperature sensor is associated with the heat trap and disposed proximate a surface of said heat trap, wherein the liquid stream is directed across the temperature sensor. The system optionally incorporates a processor and memory to store input of the temperature sensor and associate the input with a person, compare the input to historical records for the person, and determine a febrile condition for the person based on the input.
