The reanalysis of the tests are part of the IOC’s efforts to keep dopers away from the Olympic Games Rio 2016.
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A total of 23 medallists from Beijing 2008 produced provisional adverse analytical findings as a result of the second wave, which was predominantly focused on athletes who reached the podium in the Chinese capital.
Doping retests have found banned substances in 45 athletes from the Beijing and London Olympic Games.
After the initial failed tests were announced in May, the International Olympic Committee decided at a summit meeting in Lausanne to include all medal winners from Beijing 2008 and London 2012, and also expanded on the targeted analysis of only retesting athletes who were planning to compete at Rio 2016 next month. The 30 positive results came from eight countries and four sports. The 15 positive tests were from nine countries and two sports.
In total, 1,243 doping samples from Beijing 2008 and London 2012 were selected to be reanalysed in wave one and wave two.
The IOC said it was not able to identify the athletes concerned, citing legal reasons.
The IOC said it would conduct further retests from 2008 and 2012.
But a dozen global anti-doping agencies and several national Olympic committees have urged the IOC to take exemplary action and rule all Russian competitors ineligible for the Rio Games, which start in two weeks.
Russia’s track and field team has already been banned from Rio by governing body IAAF.
The IOC is expected to announce a decision this week on whether Russian Federation will face a blanket suspension from this year’s Games.
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A meeting of the IOC’s executive board will be held on Sunday with a decision to come before Wednesday.
