Former world champion Daiane dos Santos (Brazil) tested positive for the diuretic furosemide during an out-of-competition test in July, the FIG announced Friday.

The FIG submitted the case to its disciplinary commission on Thursday after notifying the 26-year-old Dos Santos.

"The gymnast’s right to reserve a hearing extends to Nov. 13, 2009, after which date the Commission will rule and submit its conclusions to the FIG Presidential Commission for a final decision," the FIG stated. "The gymnast has 21 days to appeal to the FIG Appeal Tribunal."

Dos Santos, who underwent knee surgery in October 2008, did not compete at the 2009 World Gymnastics Championships, held earlier this month in London. The two-time Olympian was Brazil's first world champion, winning floor exercise at the 2003 Worlds in Anaheim.

Raimundo Blanco, a coach at Dos Santos' club in São Paulo, told a Brazilian newspaper the news came as a shock.

"We are surprised — it's all very strange. She was out of competition," he said of dos Santos, who returned to training last month but was absent from the club Friday.

Furosemide, a diuretic, can be used to shed water weight or as a masking agent to hide other banned substances. It is a class D drug on the International Olympic Committee's list of prohibited substances, following stimulants (class A), narcotics (class B) and anabolics (class C).

Dos Santos is not the first gymnast to return a positive test for diuretics. Russian rhythmic superstars Alina Kabayeva and Irina Chaschina were stripped of their medals from the 2001 World Championships after both tested positive for furosemide.

Most recently, Vietnamese artistic gymnast Thi Ngan Thuong Do tested positive for furosemide at the 2008 Olympic Games, and her results in Beijing were nullified.