What is the normal temperature range for rectal measurements in adults?

The normal temperature range for rectal measurements in adults is typically 98.6 to 100.6 degrees Fahrenheit. This range is considered accurate because rectal temperature is one of the most reliable indicators of core body temperature. Rectal measurements usually indicate a body temperature that is slightly higher than oral readings, which average around 98.6°F (37°C). The range reflects the variation due to factors such as the time of day, activity level, and individual differences in physiology. Rectal temperature is particularly useful in clinical settings where precision is essential, such as in assessing fever or when other measurement sites are less reliable. Understanding this normal range helps healthcare providers determine when a patient is experiencing a fever or other health issues requiring further investigation or intervention.