Here's the official guide of Grey's Anatomy season 9 episode 13 "Bad Blood" -- airing on Thursday, Jan. 31 on ABC.

THE HOSPITAL IS PUT UNDER A MICROSCOPE ---

• As Derek and April work around the clock to find a solution for the hospital, Cristina struggles to respect the wishes of a family whose son is dying.
• Meanwhile, Arizona empathizes with a teenager who faces problems similar to her own.

Source: ABC