How is the medical information exchanged, and how long does it take?
Prior to the completion of trades, teams are aware of the official injured list/disabled list histories of players in the transaction. That information is chronicled in a Major League Baseball database called eBIS (Electronic Baseball Information System).
They’ve also typically researched publicly available information, such as a couple of days missed because of a sore hamstring or a player who has dealt with some soreness in his back, to identify areas of potential concern. Scouts also provide information about player health that might not show up in transactions.
But it’s only after teams agree to a trade that their trainers make available their organization’s complete files on player medical histories. Those files include MRIs and other images, trainer notes, and virtually every detail about a player’s medical history since his entry into professional baseball — thus offering far more thorough information than is known before a trade agreement.
The files are reviewed by a trainer,…