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There are three different ways in which a temperature can be taken using a digital thermometer. Depending on the circumstances and the age of the person having their temperature taken, the following methods can be used:
 For rectal temperature
Historically the standard for temperature measurement particularly in babies and small children to measure the body's core temperature. This method consists of inserting the thermometer gently into the rectum. A reliable but invasive method.
For oral temperature
The probe of the thermometer is placed under the tongue. Although this affords easy access, this method is not recommended for children under the age of 5, as the thermometer has to be kept under the tongue for the duration of the measurement. Often lower than the rectal temperature, the oral temperature is subject to certain variations (due to breathing, the room temperature, food intake, the incorrect position of the thermometer, the teeth, etc.) which can make the result less reliable.
For axillary insert (underarm) temperature
The probe is placed in the centre of the hollow of the armpit with the arm against the thorax. This is an easy way to take a temperature but can be less reliable. The skin is actually the part of the body which varies most in relation to external influences: transpiration, room temperature, weather conditions, etc.
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The differences between the
different methods of measurement
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Measurement method |
Normal temperature |
Correction factor |
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Rectal |
36.6°C – 38°C |
0°C |
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Oral |
35.5°C – 37.5°C |
±0.4°C |
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Axillary |
34.7°C – 37.3°C |
±0.9°C |
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Ear |
35.8°C – 38°C |
±0.4°C |
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Forehead |
35.8°C – 37.7°C |
±0.4°C |
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