What temperature reading indicates a fever in an adult?

A temperature of 100.4°F (38°C) or higher is recognized as the threshold for fever in adults. This standard aligns with established medical guidelines indicating that normal body temperature typically ranges around 98.6°F (37°C), though individual variations can occur. When the body's temperature rises above the normal range, it is often a sign of an underlying infection or illness, as the body uses fever as a defense mechanism to fight off pathogens.

The significance of identifying a fever lies in its role as an important clinical indicator. It often warrants further assessment and potential intervention, particularly if accompanied by other symptoms. Understanding this threshold helps professionals monitor patients effectively and respond to changes in their health status. Recognizing a fever is essential in a healthcare setting, as it can guide treatment decisions and the need for further medical evaluation.