FIRST OFF . . .

Concert-touring Rat Packers Frank Sinatra and Sammy Davis Jr. will appear in Bloomington, Minn., as scheduled tonight, despite the hospitalization of Dean Martin for a kidney ailment, tour spokeswoman Susan Reynolds said. Reynolds said she was awaiting word from Martin’s physician to see if and when the singer could rejoin the trio’s national reunion tour. Martin, 70, checked into Cedars-Sinai Medical Center in West Hollywood at 6 a.m. Monday, after completing the last of three Rat Pack shows in Chicago on Sunday night. Martin, who has a history of kidney problems, was “basically in fair condition,” hospital spokesman Ron Wise said Monday, adding that tests were being run to determine exactly what was wrong with the singer. “But right now we’re expecting that it’s just a flare-up of an old kidney condition,” Wise said. “It does require hospitalization but we’re not expecting anything terribly serious.” Martin returned to Los Angeles to be treated by his private physician, Charles Kivowitz.