How should an oral thermometer typically be inserted for an accurate reading?

• A. Tip to the back of the tongue with the mouth closed and no drinks for 15 minutes prior
• B. Tip to the front of the tongue; mouth open
• C. Place on the lips and bite gently
• D. Place under the tongue toward the back with lips closed

Answer: (D)

For an accurate oral temperature, place the thermometer under the tongue toward the back of the mouth and keep the lips closed. This position shields the sensor from air and breath and places it in a stable, relatively warm area near the blood supply beneath the tongue, helping the reading reflect true body temperature. Keep the mouth still and avoid chewing or talking until the thermometer signals a stable result. Placing the tip on the lips or on the front of the tongue can expose it to air or surface temperature and lead to less reliable readings, and opening the mouth or placing it too high against the tongue can introduce variability.