PYEONGCHANG, South Korea — A second Russian athlete at the Pyeongchang Games, a female bobsledder, has failed a doping test. The result was revealed only hours before a decision was expected on whether to allow Russia to march with its flag at the closing ceremony Sunday.

The athlete, Nadezhda Sergeeva, tested positive Friday for an unspecified performance-enhancing drug. The International Olympic Committee confirmed the failed test but did not name the athlete.

The news came as anticipation grew over the I.O.C.’s plans to meet Saturday to decide whether to lift the suspension of Russia’s National Olympic Committee and allow its athletes to march with the Russian flag during Sunday’s closing ceremony.

The reinstatement of the Russian delegation — banned for a state-orchestrated doping program that corrupted the 2014 Sochi Games in Russia — has presented a conundrum for the I.O.C., whose members disagree on how to handle the issue of the flag. The bobsledder’s failed test followed an earlier one that cost a Russian curling team their bronze medal.