"As part of its zero tolerance approach to fighting doping, the number of tests will be significantly increased," the IOC said in a statement released at the end of the coordination commission's inspection of preparations for the Beijing Games.

"Final numbers are to be confirmed but are expected to be around 4,500, a 25 percent increase on Athens 2004."

More than 3,500 tests were conducted at the Athens Games, also a 25 percent rise on the 2000 Summer Games in Sydney.