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04/26/12 2:07 PM ET

Britton to throw first bullpen session Friday

Orioles left-handed pitcher Zach Britton will throw his first bullpen session on Friday in Sarasota, Fla., as the 24-year-old continues to progress back from left shoulder impingement that put him on the disabled list to start the season.

Britton, who has been on a long-toss program at the team's Spring Training facility, has reported no problems in his recovery, and his first 'pen session was actually moved up a day from its original schedule, which is encouraging news.

Britton received two rounds of platelet rich plasma (PRP) therapy last month, a new and increasingly popular procedure that he hopes will help heal the inflammation in his left shoulder that has plagued him since August. The plan for him moving forward remains very tentative, but the organization should have a better idea of what to expect after he throws a few bullpen sessions in the next week.

The PRP procedure consists of putting the patient's blood through a centrifuge to isolate platelets and growth factors. Those are then injected back into the injured area to accelerate both healing and tissue growth.

Britton went 11-11 with a 4.61 ERA in his rookie season in 2011 and entered this year's camp expected to compete for a rotation spot, but he was slowed with shoulder discomfort along the way.

Brittany Ghiroli is a reporter for MLB.com. Read her blog, Britt's Bird Watch, and follow her on Twitter @britt_ghiroli. This story was not subject to the approval of Major League Baseball or its clubs.