The Mets on Tuesday announced the team has placed pitcher Mike Pelfrey on the 15-day disabled list, retroactive to April 22, with swelling in his right, pitching elbow.

The Mets recalled left-handed pitcher Robert Carson from Double-A Binghamton of the Eastern League.

An MRI exam conducted Tuesday morning on Pelfrey revealed the swelling. A course of treatment is pending a final diagnosis and possible second opinion.

Pelfrey, 28, was 0-0 with a 2.29 ERA in 19 2/3 innings in three starts this year.

Carson, 23, was 0-0 with a 3.18 ERA in five games with Binghamton this season. He has allowed eight hits and two runs, with one walk and six strikeouts.

The left-hander made 24 starts and one relief appearance for Binghamton in 2011.

Earlier Tuesday, the Mets put left fielder Jason Bay on the disabled list with a rib injury.