A record-setting Hungarian weightlifter was in danger of losing his silver medal Friday because he failed a drug test, a national Olympic committee spokesman said.

The IOC scheduled a disciplinary hearing later Friday for Ferenc Gyurkovics (search), who won his medal Tuesday night in the 231-pound (105 kg) class.

Gyurkovics failed his drug test, and the Hungarian Olympic Committee planned to ask the IOC to have his backup sample tested by an independent laboratory, spokesman Dezso Vad said.

Gyurkovics set an Olympic record by lifting 429 pounds (195 kg) in the snatch on Tuesday, but wound up finishing second to Dmitri Berestov (search) of Russia in the overall totals.

Four medals already have been overturned at the Athens Games for doping violations.

In addition, hammer throw champion Adrian Annus was under investigation by the International Olympic Committee (search), which located him in Hungary and told him to provide a new urine sample on Friday.

Annus passed a drug test after winning the hammer throw on Sunday, but doping control officials have been trying to find him for more testing.

The IOC wants to know whether he provided his own urine for the test or tried to beat the screening system, as teammate and discus gold medalist Robert Fazekas (search) allegedly did.

Fazekas lost his gold medal after Olympic authorities said he failed to provide enough urine for drug test. Doping control officials suspected that Fazekas may have tried to beat the test by using a catheter to inject "clean" urine into his bladder — a method used by some athletes in the past.

Fazekas has denied the charges.

In the case of Annus, "I presume if he fails to comply with all the rules and regulations of the doping code, the medal will be withdrawn," said Pal Schmitt, head of the Hungarian Olympic committee.

Annus retired Thursday, but remains under the jurisdiction of IOC doping rules through Sunday, the end of the games. If found guilty of a doping offense by then, he would also lose his medal.

IOC president Jacques Rogge said Friday that Annus will be subjected to out-of-competition testing. Without specifically referring to him, Rogge said the IOC can use DNA tests to match urine samples.

"This is something we have in our weaponry. We didn't need it at this stage, but we have it and it might be used in the future," he said.