Today’s digital thermometers have revolutionised temperature measurement and brought advanced medical technology to your bathroom cabinet. A thermometer should measure your core body temperature, which is the temperature of your heart, brain and other organs. This is usually measured in your ear because your eardrum temperature, which provides an accurate reflection of how warm your body is. Measuring temperature in the ear is much more comfortable and convenient than in the mouth, especially for children.
OMRON offers a range of in-ear, infrared (contactless), and pencil/stick thermometers. In-ear and infrared models are particularly suitable for small children because they have a fast measurement feature. Some of these thermometers also have a large backlit display which is ideal for night-time use.
The most reliable core temperature is obtained by inserting a thermometer into the rectum (rectal measurement). This measurement is accurate and has low possibility for errors in the results. The normal range is approximately: 36.2°C – 37.7°C.
This is also a very reliable method of measuring core temperature. In this case a thermometer capable of detecting the infrared heat given off by the ear drum (tympanic membrane) is used. This measurement is accurate and has low possibility for errors in the results. The normal range is approximately: 35.5°C - 37.5°C.
The oral measurement can be performed as ‘in the cheek’ measurement (called buccal) or as a ‘under the tongue’ measurement (called sublingual). Both measurements underestimate the rectal temperature by approximately 0.3° C – 0.8° C, with the ‘under the tongue’ measurement being preferable to ‘in the cheek’.
Body surface temperature measurements used in clinical practice are in the arm pit (axillary measurement) and in the groin. In both cases the respective limb is pressed against the body in order to reduce any ambient temperature influence. However, this is successful only to a limited extent with the disadvantage that the measurement time is long. In adults, the axillary measurement is lower than the rectal by as much as 0.5°C – 1.5°C! In infants, these differences, in comparison with the rectal temperature, are much smaller.