The measurement of body temperature usually takes 5-8 minutes, while the normal body temperature is a range. Generally speaking, when it comes to measuring body temperature, it will involve the temperature of 3 parts, axillary, oral and anal. The time required in measuring the temperature of these 3 parts is different, for example, the time required for measuring anal temperature can be shortened to 5 minutes, and the time required for measuring axillary temperature is relatively longer, taking 7-8 minutes. The normal temperature of the axillary temperature is 36.0-37.0°C, the normal temperature of the oral cavity is 36.3-37.2°C, and the normal temperature of the anal temperature is 36.5-37.7°C. In general, body temperature is not fixed and can fluctuate normally with age, day and night, gender and emotion, which are inevitable. Children have a slightly higher body temperature than adults due to a high metabolic rate, and older people have a lower body temperature in the normal range due to a lower metabolic rate. In general, normal human body temperature is lowest in the early morning from 2-6 am and highest in the afternoon from 2-8 pm, but the fluctuation range is usually no more than 0.5°C above and below the average.