University of Southern California defensive end Armond Armstead was released from USC University Hospital on Tuesday, Trojans coach Lane Kiffin announced.
Armstead, a senior, was admitted to the hospital Thursday to undergo tests for an unspecified medical condition.
"I'm very happy to report that Armond was released from the hospital today," Kiffin said in a statement. "He is back with us, but he will not resume conditioning workouts until the results of all his medical tests are completed."
Armstead, 20, started 11 games for the Trojans last season and recorded 43 tackles and three sacks. He is expected to start at defensive end as a senior in 2011 after he decided in December to stay for his final season.
He has played both defensive tackle and end at USC but has frequently been sidelined by injuries, including a broken foot and sprained shoulder. He also missed time during fall camp last year with what the coaching staff termed dehydration.
"My family and I want to thank everybody for their thoughts and prayers," Armstead said Tuesday. "I heard from so many people and I really appreciate their support.
"I feel good, my spirits are up, I'm ready to go back to class."
Pedro Moura covers colleges for ESPNLosAngeles.com.