Which of the following best summarizes the fever threshold?

Which of the following best summarizes the fever threshold?

• A. Fever is defined as 38 C or higher.
• B. Fever is defined as 37 C or higher.
• C. Fever is defined as 39 C or higher.
• D. Fever is defined as 40 C or higher.

Answer: (A)

Fever is defined by a rise above the normal body temperature, and the standard cutoff used in most guidelines is 38°C (100.4°F). Normal body temperature sits around 37°C, with slight fluctuations based on time of day and where you measure it (oral, tympanic, axillary, or rectal). Using 38°C as the threshold provides a practical line between normal variation and fever. Temperatures lower than this may occur with minor illness, but they don’t meet the typical fever definition, while higher values describe the fever’s intensity, not the threshold itself. So, 38°C or higher best captures the fever threshold.

Fever is defined by a rise above the normal body temperature, and the standard cutoff used in most guidelines is 38°C (100.4°F). Normal body temperature sits around 37°C, with slight fluctuations based on time of day and where you measure it (oral, tympanic, axillary, or rectal). Using 38°C as the threshold provides a practical line between normal variation and fever. Temperatures lower than this may occur with minor illness, but they don’t meet the typical fever definition, while higher values describe the fever’s intensity, not the threshold itself. So, 38°C or higher best captures the fever threshold.