Uzbek gymnast Luiza Galiulina became the third athlete to be expelled from the Olympics for doping after her B sample also tested positive for the banned substance furosemide.
Uzbekistan's only gymnast at the Games had been provisionally banned on July 29 after her urine sample had showed traces of the diuretic that can be used as a masking agent for other performance-enhancing drugs.
"The athlete's file shall be transmitted to the Federation Internationale de Gymnastique (International Gymnastics Federation), which is requested to consider any further action within its own competence," the IOC said.
The 20-year-old Galiulina, who also competed at the 2008 Games, faces a maximum two-year ban as a first-time offender.
Furosemide, often sold under the brand name Lasix, can be used to treat high blood pressure, congestive heart failure or swelling caused by excess fluid retention. It has also been used to prevent horses from bleeding through the nose during races.
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