SAINT-DENIS, France -- Kelli White passed a drug test after winning the 200 meters but still could lose her two gold medals from the World Championships, track officials said Sunday.

The results from the second test were revealed one day after officials from the International Association of Athletics Federations said White had tested positive following her victory in the 100.

White won gold in the 100 a week ago and completed the sprint double in the 200 on Thursday, becoming the first American woman to sweep both events at a world championships.

Even though White tested clean after the 200, the IAAF said her positive test after the 100 would be enough to cost her both medals.

"It would be wrong to say, `You are doping on Sunday, and you're out,' and then say, `You can win the same medal Thursday at the same championships,''' Istvan Gyulai, general secretary of the IAAF, said Sunday. "I believe this is an important moral message.''

The IAAF said Saturday that White risked being stripped of all her championship results if found guilty of a doping offense. She also could face a two-year suspension that would rule her out of the 2004 Athens Olympics.

Gyulai said the IAAF was continuing to investigate the exact nature of modafinil, a prescription medication which White said she used for a sleep disorder.

While not specified by name on the banned list, modafinil is covered under the stimulants category of "related substances,'' the IAAF said.

Under IAAF rules, the penalty for use of light stimulants, such as ephedrine, is disqualification and a warning. For harder stimulants, such as amphetamines, the sanction is disqualification and a two-year ban.

Gyulai said the IAAF is trying to determine how to classify modafinil. He said that could take four or five days.

After that, Gyulai said, the IAAF could: accept White's explanation and consider clearing her on grounds; disqualify her and give her a warning; or, disqualify her and recommend a two-year ban.

If the IAAF decides modafinil falls into the strong category, White would be suspended pending a hearing by USA Track & Field, Gyulai said. Her case would then be handled by the U.S. Anti-Doping Agency, and could potentially end up before the Court of Arbitration for Sport -- a process that could take months.

The IAAF needs to clarify White's status soon because she is scheduled to run Friday at the Golden League meet in Brussels. She also plans to compete in the Grand Prix final in Monaco on Sept. 13-14 and an invitational meet in Moscow on Sept. 20.

USA Track & Field chief executive Craig Masback said he had only been notified of White's test result from the 100, and can't take action until getting more details from the IAAF.

At a news conference Saturday, White acknowledged taking modafinil the morning of the 100 final. But she denied ever taking a substance to enhance her performance, saying she took the medication to treat narcolepsy and had no idea it contained a banned substance.

White said she didn't apply for a medical waiver or include the medication on her doping control form as required because it wasn't named on the prohibited drug list. She said she and her doctor did extensive research on modafinil before deciding to use it for narcolepsy, which causes sudden fatigue or sleepiness.

If White loses the medals, she would be the biggest track name stripped of gold at a major championship since Ben Johnson at the 1988 Seoul Olympics.

"She was the star of the championships, and now she's at the center of a doping case,'' former Olympic and world champion Michael Johnson wrote in his daily column in the French sports daily L'Equipe. "It creates trouble for our sport. It's a big cloud over these championships.''