According to the inquiry of Yi Yun Health Network, it is necessary to have a blood test to apply for a health certificate. If you can't drink water before blood test, don't drink water after 0/2 o'clock the night before blood test. Just go to the hospital for blood test on an empty stomach at 8 o'clock in the morning. Those who apply for health certificate examination are all basic projects, just go to the hospital physical examination department. Pay attention to observe whether there are any discomfort symptoms at ordinary times. It's best to go to the hospital for a physical examination every year to find the disease and treat it as soon as possible.