Which method is considered the most accurate for measuring body temperature?

The rectal method is considered the most accurate for measuring body temperature due to its close proximity to the core body temperature. This method provides a reliable indicator of the body's internal temperature, making it especially useful in clinical settings or when precise measurements are necessary. The rectal route minimizes the influences of external factors, such as ambient temperature or environment, that might affect readings obtained through other methods.

In certain situations, such as with infants or patients who are unresponsive, rectal thermometry is often the preferred choice, as it can provide stable and consistent readings. The methodology involves inserting a thermometer into the rectum, which accurately reflects the body's internal heat compared to other routes that may yield lower or less consistent results.

Temperature readings obtained through axillary (armpit) and oral (mouth) routes tend to be lower than those gotten rectally, while temporal artery thermometers measure the temperature of the forehead, which can be influenced by skin temperature and external conditions, making them less reliable than the rectal method.