The average normal body temperature is between 36 and 37℃ (underarm). Over 37.3℃ means fever, 37.3 ~ 38℃ means low fever, and 38. 1 ~ 40℃ means high fever. Life is in danger at any time above 40℃. Normal values: oral sublingual temperature is 36.3 ~ 37.2℃, rectal temperature is 36.5 ~ 37.7℃ higher than oral temperature (0.2 ~ 0.5℃), and axillary temperature is 36.0 ~ 37.0℃. The standard of normal body temperature is based on the value of most people, not the absolute value of individuals.

The application scope of health code covers community management, resumption of business, transportation, starting school, drug purchase registration, supermarkets and shopping malls, which can help communities, enterprises and schools to do key work such as epidemic prevention management and epidemic control. In the prevention and control of epidemic situation and resumption of production, health code can realize efficient personnel flow management, improve the inspection efficiency of office buildings, shopping malls, subways, railway stations and other crowded places, and avoid excessive personnel contact and gathering.