Last week the Sunday Times and German broadcaster ARD/WDR published detailed article where they had obtained access to the results of 12,000 blood tests from 5,000 athletes between 2001 and 2012.
According to the reveals the "extraordinary extent of cheating" by athletes at the world and Olympic games.
More than 800 athletes - one in seven of those named in the files - have recorded blood tests described by one of the experts as "highly suggestive of doping or at the very least abnormal".
A third of medals (146, including 55 golds) in endurance events at the Olympics and World Championships between 2001 and 2012 were won by athletes who have recorded suspicious tests. It is claimed none of these athletes have been stripped of their medals.
Also report says that seven London Marathon winners in a 12 year period have showed suspicious blood values.
IAAF have denied all the claims by the Sunday Time and ARD/WDR.
"They do not have access to IAAF testing records and are therefore not able to know if proper testing follow-up was conducted." said IAAF in their report.