A mouth thermometer, typically a digital device, provides a convenient and reliable method for measuring body temperature in adults and older children. This technique measures the temperature of the mucous membranes in the mouth, which closely reflects the body’s internal core temperature. While the average oral temperature is often cited, individual baseline temperatures naturally fluctuate throughout the day and between people. Achieving an accurate reading requires understanding both the necessary preparation and the proper placement technique.
Preparing for an Accurate Reading
The most impactful step for an accurate oral temperature reading is ensuring the mouth environment has normalized before measurement. Consuming hot or cold beverages, eating, chewing gum, or smoking temporarily alters the temperature of the oral cavity tissues. Wait at least 20 to 30 minutes after any of these activities before placing the thermometer to allow the mouth to equilibrate.
The device requires a brief check before use. Confirm the digital display is functional and the battery has sufficient charge. If a probe cover is used, ensure it is securely placed without touching the tip, which maintains hygiene. The thermometer should be turned on and reset before beginning the process.
Technique for Oral Temperature Taking
Once preparation is complete, turn the thermometer on and place the tip under the tongue. Position the probe deep within one of the posterior sublingual pockets, located on either side of the base of the tongue. These pockets are positioned close to the sublingual artery, which provides a temperature reading that closely correlates with the core body temperature.
The thermometer probe should be slightly off-center and held gently in place by the tongue. Keep the mouth completely closed around the device for the entire duration of the measurement. Breathing should be done slowly through the nose to prevent cooler air from interfering with the reading.
Do not bite down on the thermometer, as this can damage the sensor. The device will emit an audible signal, such as a beep, indicating the temperature has stabilized. Once the signal sounds, carefully remove the thermometer and record the displayed numerical value.
Interpreting Results and Post-Use Care
After taking the measurement, understand what the reading signifies in the context of oral temperature. The normal oral temperature range for adults falls between 97.5°F and 99.1°F (36.4°C to 37.3°C), though slight daily variations are common. A temperature of 100.4°F (38°C) or higher, measured orally, is considered the threshold for a fever.
Proper hygiene is necessary immediately after use to prevent the transfer of microorganisms. Clean the probe with a cotton ball soaked in rubbing alcohol with at least a 60% concentration. Alternatively, rinse the tip with lukewarm soapy water, taking care not to submerge the digital display or battery components.
The thermometer must be allowed to air-dry completely before being stored. Store the device in its protective casing, away from excessive heat or moisture. Storing the device properly ensures the sensor remains clean and accurate for future use.