LAHORE, Pakistan — The Lahore High Court of Appeals on Thursday upheld the death sentence of a Pakistani Christian woman in a high-profile blasphemy case and dismissed her appeal for acquittal.

The defendant, Asia Bibi, 47, a farmworker, was sentenced to death in 2010 after being convicted of blasphemy. She has denied the accusations, which she said stemmed from a dispute with Muslim co-workers.

Ms. Bibi now plans to appeal the decision in the country’s Supreme Court, said her lawyer, Naeem Shakir. But given huge backlogs at the court, analysts said it would probably be at least three years before the appeal would be taken up.

The ruling was the latest chapter in a long ordeal for Ms. Bibi, whose case has focused international attention on how Pakistan’s blasphemy laws have become a weapon against religious minorities.