What is the normal range for oral temperature in Celsius?

• A. 35.8 - 37.5 degrees
• B. 36.5 - 37.0 degrees
• C. 35.0 - 36.5 degrees
• D. 37.0 - 38.5 degrees

Answer: (A)

The main idea is that oral temperature reflects body heat as measured at the mouth, which tends to be a bit lower than core body temperature due to heat exchange with the environment. For a healthy person, a typical normal range when taken orally is about 35.8°C to 37.5°C. The lower bound around 35.8°C accounts for natural variation between individuals and the small influences of recent activities (like eating, drinking, or smoking) and the time of day. The upper end of 37.5°C stays within normal limits, while values consistently above this usually signal fever and values well below 35°C could indicate hypothermia or measurement error. To get an accurate reading, use proper technique: place the thermometer under the tongue, keep the lips closed, and avoid talking or recent hot/cold intake.