What is body temperature?

Body temperature refers to the internal temperature of the body. "Normal" body temperature depends on when, where and in whom it is measured. Body temperature fluctuates in a 24-hour cycle. It tends to be lowest in the early morning and highest in the late afternoon. Body temperature also varies from one site in the body to another and age as well. Body temperature may also increase as a result of overdressing or strenuous exercise, especially during hot weather. Improper temperature taking may cause false alarm as well. There are many things that can affect your body temperature like extreme activity, ovulation, pregnancy, age younger than 3 months, old age, smoking, etc.

Normal temperature ranges - by point of measurement
34.7 ~ 37.3
35.5 ~ 37.5
35.8 ~ 38.0
36.6 ~ 38.0
Normal temperature ranges - by age
0~2 years
36.4 ~ 38.0
3~10 years
36.1 ~ 37.8
11~65 years
35.9 ~ 37.6
> 65 years
36.8 ~ 37.5

1) Chamberlain, J.M., MD, and Terndrup, T.E., MD, "New Light on Ear Thermometer Readings ", Contemporary Pediatrics; March, 1994.
2) Chamberlain, J.M., MD, and Terndrup, T.E., MD, "Determination of Normal Ear Temperature with an Infrared Emission Detection Thermometer",
Annals of Emergency Medicine; January 1995


What is the normal temperature for a child?

If you take the temperature in your child's mouth or from the ear, the normal temperature is 36 to 36.8C (97.7 to 99.1F).


What is fever?

Fever occurs when the body creates extra heat so that the foreign organism cannot survive. In essence, it is part of the body's defense mechanism against viruses or bacteria. Thus, it Is safe to say that fever is a good thing, most of the time.

People usually take actions to reduce a fever and it can help make them feel more comfortable. But it's not possible, or desirable, to aim to normalize the temperature ? while someone is fighting off an infection.

In some rare cases, a child with high fever will have a seizure, if his/her temperature shoots up. But since this is uncommon and there is no reason to try to reduce the temperature of a child with a common fever.


What is infrared ear thermometer?

Infrared ear thermometers use an infrared sensor to measure the temperature of energy radiating from your eardrum. T he eardrum is an extremely accurate point to measure body temperature from because it is recessed inside the head. However, the eardrum is so fragile that you don't want to touch the eardrum with a thermometer. Using infrared radiation, this problem can be easily solved since the eardrum temperature can be detected remotely. The idea behind the temperature sensor in the ear thermometer is to create a device that is sensitive to very subtle changes in infrared emission. One common sensor is the thermopile , which can be accurate to a tenth of a degree. The thermopile sees the eardrum and measures its infrared emissions. The emission is converted into a temperature and displayed on an LCD.


What is Infrared Radiation?

Infrared (IR) light is electromagnetic radiation with a wavelength between 0.7 and 300 micrometers, which equates to a frequency range between approximately 1 and 430 THz. We cannot see the IR light because IR wavelengths are longer than that of visible light. But, every object around you is radiating infrared energy right now. Although we cannot see the infrared light, our skin can detect objects radiating lots of infrared energy. For example, when you warm yourself by standing close to a fire, the "warmth" is infrared energy that you are absorbing.


The ear temperature indicated is rather high. What are the causes?

1) The probe cover is broken.
2) You used the thermometer that had been stored in the cold. Measure the temperature after leaving the unit for more than thirty minutes in the room where you are going to take temperature. If you store the unit in the room where you are going to measure the temperature, you can use the thermometer immediately.


The ear temperature indicated is rather low. What are the causes?

1) The probe cover is dirty.
2) The infrared sensor is dirty.
3) The unit is removed from the ear before the measurement is finished.
4) The ear is cooled. The temperature indicated tends to be low when you use an ice bag, or immediately after coming home in winter.
5) The thermometer is not inserted deep enough in the ear.
6) The infrared sensor is not directed towards the eardrum. Alternatively, you can use the "Direct Mode".


Is the temperature measured in the right ear different from that measured in the left ear?

For healthy people, there should be almost no difference in the measurement results, the following conditions may cause differences in the readings:

1) The infrared sensor is not inserted in the same way.
2) Measurement is not conducted in a stable manner by inserting the unit at the same angle. Try to measure in the ear that can show the highest measurement value constantly.


The ear is too small to insert the probe. What should I do?

While slightly pulling the ear towards the back, insert probe without force so that it just cover the external auditory canal.


How do I clean the thermometer?

1) Main unit: Wipe off dirt on the main unit with a soft dry cloth. Never wash the unit or clean with a cleaner containing abrasive, thinner, or benzine.
2) Infrared sensor: When the infrared sensor becomes dirty, wipe it lightly with a soft dry cloth or a cotton swab. Do not wipe the infrared sensor with a tissue paper or a paper towel.


Why is the forehead temperature measurement mode effective?

The forehead thermometer scans the forehead area for the temporal artery and it is almost impossible to miss the artery during a scan. Thus, an accurate result can be easily obtained. However, please note that if you don't place the thermometer on the temporal artery, the reading will not be accurate and you may need to practice it before actual use.