Fever measurement temperature measurement rectum closest to the body temperature, the temperature is closest to the accurate value, the normal value of rectal temperature is 36.5 ~ 37.5 ℃. However, the rectal part of the measurement is not convenient, the most common clinical measurement of the part of the axilla, but also the most simple and easy to operate. The most accurate site is not convenient to measure, generally take the axillary measurement, the normal value of the axillary body temperature is 36~37 ℃. At present, the main body temperature measurement infrared measurement of frontal temperature, ear temperature and thermometer measurement of the oral cavity, axilla, rectum. Relatively speaking, infrared measurement of forehead, ear and other body surface temperature is susceptible to external environmental influences, oral measurement is easy to cross-infection, measurement of rectal temperature is closer to the real temperature of the body, but the measurement is not convenient, so the clinic more use of the axillary method of measuring body temperature. Before using a mercury thermometer to measure body temperature, be sure to dump the mercury column to below 35 degrees, which can make the measurement of body temperature more accurate. When using a mercury thermometer to measure the temperature in the armpit, place the mercury column measurement in the armpit, pay attention to whether the armpit is dry or not, if there is sweat in the armpit you need to dry it, and take out the reading after measuring for 5 to 10 minutes in a quiet state. It is recommended that if the value measured at home is high or the error in the value measured repeatedly is large, it is best to go to the hospital for further examination.