You need an empty stomach to apply for a health certificate, and you need a blood test to apply for a health certificate. Generally, it can be from 8: 00 am to 10, mainly depending on whether the patient has infectious diseases, so be sure to have an empty stomach when checking and handling symptoms.
It should be noted that the processing time of health certificates is different in different regions, and the processing time of health certificates will be determined according to hospital regulations and working hours of local administrative departments.