Which method provides the most accurate temperature reading?

The rectal method is considered the most accurate for measuring body temperature. This is because the rectum is a closed cavity that typically maintains a stable temperature that reflects the true core body temperature. The rectal measurements are less affected by environmental factors and provide a more reliable estimate of the body's internal temperature compared to other methods.

The oral method can produce variable results based on factors such as recent eating, drinking, or smoking, which can alter the temperature in the mouth. The aural method, which measures temperature in the ear, relies on infrared sensors and can be influenced by external factors such as earwax or the position of the thermometer in the ear canal. Lastly, the axillary method measures temperature under the arm, which is less accurate as it can be significantly affected by environmental conditions and is generally considered the least reliable indicator of core body temperature.