Gustavsson was removed from a game against the Anaheim Ducks on Jan. 26 due to an elevated heart rate, and was taken to Massachusetts General Hospital to be looked at.
The 31-year-old has had to miss time several times in his career with the same issue.
"The final testing is complete and all results have been reviewed by the Bruins Medical Staff," reads an update by the Bruins. "Jonas has been cleared to resume full on-ice participation with the team without any restrictions."
The Bruins also assigned goaltender Malcolm Subban to Providence of the AHL. Subban was called up in Gustavsson's absence but did not appear in any games.
Gustavsson, who is playing on a one-year contract signed in October, is 9-3-1 this season with a 2.38 goals-against average and a .915 save percentage in 15 games with Boston.