The one in Shiwan mentioned by LS is the center for disease control and prevention in Chancheng District, Liuyuan 4th Street, Shiwan. You can take the bus 154 and 120 to get off at the "Ceramic Research Institute" station and then turn to another bay. After getting off the bus, you can ask where the People's Center is, or where the library is, next to the library.
I don't know where you are. For detailed bus stops, please ask Baidu to inquire about "Foshan Bus", and enter the route or stop at the stop to inquire for yourself.
Have you arrived yet? Foshan Center for Disease Control and Prevention? Ok, you can go there to get the certificate after the physical examination. But it may not be the same day, because some items such as blood tests will not be available until the next day, and health certificates may not be available until 2-3 days after physical examination.