Turner has a leg infection that required a trip on Tuesday to the emergency room, manager Don Mattingly said on Tuesday.
"Justin had a pimple on his leg in New York. They gave him antibiotics there," Mattingly said. "He came in today and it was a lot worse, so we sent him down to the emergency room. We should know more by tonight."
The pimple is on Turner's inner thigh, and apparently got worse on Monday's off day.
"They started him on antibiotics to be careful," Mattingly said. "It wasn't bad [in New York]."
After the game, Mattingly said Turner received antibiotics both orally and intravenously, and is out of the hospital. Turner will be back at Dodger Stadium on Wednesday.
Alberto Callaspo gets the call at third base on Tuesday.
Turner started the previous four games.
The Athletics have been busy since their last game, first trading Tyler Clippard to the Mets on Monday, then dealing Ben Zobrist to the Royals on Tuesday. Oakland recalled relief pitcher R.J. Alvarez from Triple-A Nashville to take Clippard's spot on the active roster, but it is unknown whether they will have a replacement for Zobrist in Los Angeles by game time or if they will play with a 24-man roster in the series opener.
Zobrist played mostly second base and left field for the A's, who on Tuesday night have Eric Sogard and Jake Smolisnki at second base and left field, respectively.