An IAAF review board reached a decision on world champion Torri Edwards's doping case on Thursday, but the US Anti-Doping Agency (USADA) declined to reveal it's findings until the ruling is finalised.
"USADA has forwarded the IAAF decision to the American Arbitration Association panel for its ruling," the agency said in a statement from its Colorado Springs headquarters.
"When a ruling has been finalised, USADA will make an announcement."
Edwards is facing a two-year ban after testing positive for the banned stimulant nikethamide at an April meeting in Martinique.
If the ban is imposed, she would miss the Athens Olympics, which would be a serious blow to the US women's team.
Edwards made the team in the 100 and 200 metres and was expected to run on the US 4x100 metres relay.
The sprinter contends she was given glucose tablets at the Martinique meeting by her physical therapist, who did not know they contained nikethamide.
A US arbitration panel determined there "may be exceptional circumstances" for her positive test and referred the case to the IAAF, which made its decision this week.
{{/usCountry}}A US arbitration panel determined there "may be exceptional circumstances" for her positive test and referred the case to the IAAF, which made its decision this week.
{{/usCountry}}If the US panel rules against Edwards this time, she has the right to appeal to the Swiss-based Court of Arbitration for Sport (CAS).