Generally, provincial capital cities are called blood centers, local blood centers are located in prefecture-level cities, and larger county-level blood centers are called blood banks.
Generally speaking, there is only one blood center or central blood station in a city, and the blood center and central blood station are not subordinate.
Nanjing has Jiangsu Blood Center and Nanjing Blood Center.
Shenzhen has Shenzhen Blood Center, Security Center Blood Station and Longgang Center Blood Station.