How many minutes does a thermometer take to measure body temperature?

Generally, the time required for temperature measurement varies depending on the specific measurement site. For axillary measurement, the thermometer is usually held under the armpit for 5-10 minutes. For oral measurement, the measurement time is approximately 3-5 minutes. For rectal measurement, the procedure typically lasts about 3-5 minutes. Detailed explanations are as follows:

For axillary measurement, the thermometer is usually held under the armpit for 5-10 minutes to ensure sufficient heating of the mercury column, thus accurately reflecting body temperature. If the measurement duration is too short, the mercury column may not rise adequately, potentially resulting in a lower reading that does not accurately reflect the actual body temperature.

For oral measurement, the thermometer is generally placed under the tongue, with a measurement time of approximately 3-5 minutes. It is important to avoid consuming hot or cold beverages for at least 10 minutes prior to measurement to prevent affecting the accuracy. Additionally, the lips should be tightly closed during measurement to ensure full contact between the thermometer and the oral cavity.

For rectal measurement, which is required for infants, young children, or individuals who are unconscious and unable to cooperate with oral measurement, the thermometer must be gently inserted through the anus into the rectum. The procedure typically lasts about 3-5 minutes. The movements during operation should be gentle, and the insertion depth should be appropriate, as inserting too deeply or too shallowly may affect the accuracy of the measurement.

In daily life, it is recommended to wipe the thermometer dry before measuring body temperature and to check the displayed temperature. If the temperature shown exceeds the minimum scale, the thermometer should be shaken first to bring the mercury level down below the scale line before proceeding with the measurement.