Get a health certificate from the Center for Disease Control and Prevention after physical examination at HP Center. Health certificates are generally handled at the local centers for disease control and prevention. Laborers engaged in operations exposed to occupational hazards shall undergo health examination before taking up their posts, and if they meet the requirements, they shall be issued with health certificates. Health certificate is the proof of preventive health examination, which proves that workers have the health quality of employment. The validity period of health certificate is generally one year, and the holder of health certificate needs to have a health examination once a year, and can consult the local CDC.