Currently, the measurement of body temperature can be done by using a mercury thermometer to measure the axillary temperature, oral temperature and rectal temperature. Regardless of which part of the body is being measured, the recorded value will be whatever the body temperature is, and there is no need to add or subtract additional values. However, it should be clear that the normal range of temperatures obtained from different parts of the body is different. The armpit temperature is normally between 36-37℃, so if it exceeds 37.3℃, it is considered that there is a fever. Therefore, the value obtained from the measurement of the axillary temperature is recorded without adding or subtracting, but it should be noted that the value of the body temperature should be compared with the normal value of the axillary temperature to determine whether there is a fever or not. The normal value of oral temperature is usually 36.3-37.2℃, and the normal value of rectal temperature is between 36.5-37.7℃.