Which body temperature measurement method typically yields the highest reading?

The rectal method of measuring body temperature is generally recognized as yielding the highest reading compared to other methods. This is due to the rectum being located internally and providing a centralized measurement of core body temperature. It reflects the body's actual temperature more accurately because it is less affected by external factors such as ambient temperature and recent physical activity.

When measuring temperature via the oral route, it can be influenced by factors like recent food or drink intake, breathing through the mouth, and even the location of the thermometer in the mouth, which may result in somewhat lower readings compared to rectal measurements. The axillary method, which involves taking the temperature under the arm, tends to be the least reliable and typically yields lower readings because it is more susceptible to variations in external temperature. The tympanic method, utilizing the ear canal, often provides results that are close to core body temperature, yet they can still be slightly lower than rectal measurements due to potential inaccuracies relating to earwax or improper placement of the thermometer. Hence, rectal temperature measurement is considered the gold standard for the most accurate representation of core body temperature.