(Corrects 2nd par to 'flyweight' from 'featherweight')
* Australian, Oceania champion tests positive for diuretic
* Blames treatment for "swollen ankles"
Australian boxer Bianca Elmir's hopes of competing at the London Olympics are in jeopardy after she was slapped with a provisional ban for failing a doping test at national championships in February.
Elmir, Australia's flyweight champion, had tested positive for a banned diuretic at the championships in Hobart.
She was notified of her suspension shortly after arriving in China to compete at the women's world championships in Qinhuangdao, her manager Alex Belperio told Reuters.
"It's a provisional ban, that's all we know," Belperio said by telephone. "We appealed to have the ban lifted so she could compete in China, but the appeal was unsuccessful.
"It's been a bit of an emotional roller-coaster for her as you can imagine.
"We need to find out more information to determine what actions we can take in relation to this ban."
Elmir was due to compete in the women's flyweight (48-51kg) category at the world championships, where a first-place finish among the Oceania boxers would have booked her ticket to London, where women's boxing will debut. She was regarded as one of Australia's strongest medal hopes in the sport.
The Australian Sports Anti-Doping Authority (ASADA) was unavailable to provide comment, but was expected to make a statement later on Wednesday.
In general practice, ASADA will only recommend Australia's sports authorities implement bans for doping violations after the athlete has returned positive results for a banned substance for two tested samples -- the "A" test and the second "B" test.
Boxing Australia declined comment.
Elmir's coach Garry Hamilton said the boxer had taken a tablet before the national titles to treat "swollen ankles" on a long-haul flight.
"She's taken the substance, that's not denied, but she wasn't aware it was going to do what it did, it wasn't done to help her with her boxing," Hamilton told local media.
"I really believe she's taken it for this medical reason, and only for this medical reason."
Hamilton was expected to further appeal the provisional ban.