Final answer:
The most accurate method for measuring body temperature is an infrared ear thermometer, which is both precise and minimizes the potential for cross-contamination. Digital medical thermometers are also accurate, as they measure changes in the resistance of a thermistor related to temperature fluctuations.
Step-by-step explanation:
The most accurate route for taking a patient's temperature is through the ear canal using an infrared ear thermometer. This technology measures the energy emitted by the eardrum, similar to how an astronomer would measure the temperature of stars.
Infrared ear thermometers are more precise than traditional alcohol thermometers because they minimize contact with mucous membranes, reducing the risk of cross-infection and capable of taking rapid measurements. It is important to have an accurate measurement, as a thermometer with a high uncertainty can be ineffective in determining a patient's health status accurately.
When using a digital medical thermometer, the device measures the resistance of a thermistor to determine temperature. Resistance changes with temperature, providing a measurement which can be compared to a baseline to ascertain the patient's body temperature. These devices are precise and avoid issues with thermometers that have large uncertainties, which would render their readings as unreliable.