9. Some Useful Information
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Knowing One’s Normal Temperature
In order to make a correct judgment of suspected fever conditions, it is important to know one’s normal temperature.
Normal temperature varies with the individual and also changes depending on the time through a day. In addition, measured
body temperatures may vary depending on the thermometer or the body part where you measure (see the graph “Variances
in core body temperatures obtained at the forehead and mouth”). To find out one’s normal temperature, therefore, we
recommend performing regular measurements under the following conditions:
- Measure with the same thermometer.
- Measure at the same area.
- Measure at the same time of day.
60
50
40
30
20
10
0 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
Variances in core body temperatures obtained at the forehead and mouth
(Cases surveyed: 190, ages: 0 - 68, environment temperature: 23 ± 2 °C)
Equivalent
Oral higher
Forehead higher
Number
of
cases
Temperature difference (°C)
(Survey conducted
by Omron)
60
50
40
30
20
10
0 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
