"They drew my blood and injected the platelets from my blood into my oblique because it is supposed to speed up the healing process," Davis told The Baltimore Sun.
Baltimore (12-12) has seen its fortune at the plate at home reversed this season. The Orioles averaged 4.7 runs at home a year ago for baseball's fourth-best mark but are at a major league-worst 2.6 heading into an interleague series against the Pittsburgh Pirates.
"There are going to be injuries -- that's why you have a 40-man roster," center fielder Adam Jones told the Orioles' website. "That's why you have guys in the minor leagues. Now, you have guys that are backups. You never know what could happen."
Davis, who led all AL players with a .427 interleague average last year, was placed on the disabled list over the weekend and is eligible to return May 11.
"It's the same as it was a few days ago. We have to wait," Davis told the Sun. "It was pretty sore today, so we'll wait a couple days to see how I feel, and then continue getting treatment, and hopefully it won't be too long."
Manager Buck Showalter already has indicated Davis is likely to miss more than the minimum 15 days, which is not unusual for this type of injury.
Davis, who led the majors last season with 53 home runs and 138 RBIs, is hitting .250 with two home runs and 13 RBIs this season.
The Associated Press contributed to this report.