If you are working in China and in Changsha, you need a health certificate.
You should have a medical check up at this place:
You will have a full medical check up there. It is very modern and convenient. You will need a photo and to wait a few days. You can take some photos accross the road.
The street is called Shazitang near the crossroad with Shaoshan Road a little farther away from Dongtang.
Note: this place is also where Chinese people need to go for their medical check up. This visit is required for Chinese who want to go abroad and also when you work for some Chinese companies.