GREY'S ANATOMY - "What a Difference a Day Makes" - Bailey examines Izzie in order to clear her to go to Meredith and Derek's wedding, on "Grey's Anatomy," THURSDAY, MAY 7 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/SCOTT GARFIELD) JUSTIN CHAMBERS, CHANDRA WILSON, KATHERINE HEIGL