What is the normal range for adult body temperature?

The normal range for adult body temperature is typically recognized as being between 97°F (36.1°C) and 100.4°F (38°C). This range accounts for what is considered a normal physiological variation based on factors such as the time of day, the individual’s age, activity level, and the method of measurement.

Body temperature can fluctuate throughout the day, usually being slightly lower in the early morning and higher in the late afternoon and evening. The upper limit of 100.4°F marks the threshold for what is generally considered fever, indicating that temperatures above this could suggest an underlying infection or illness.

The other ranges provided are either too broad or do not align with the established medical consensus regarding normal body temperature. Understanding this range is essential for healthcare providers when assessing a patient's health status, recognizing deviations from the norm that may indicate a need for further evaluation or intervention.