feature Lab Results Marcia Kraniak—79 years old, from the South Side of Chicago—went home from the hospital eight weeks ago. She had been admitted to the University of Chicago Medical Center (UCM) with congestive heart failure and spent three days there. Fluid had built up in her body, and her heart was too weak to pump enough blood. She couldn’t move around easily. Two months after leaving the hospital, however, she’s doing well on her new regimen at home. Shortly after Kraniak arrived in the UCM emergency department, hospital staff identified that her medical condition, her home life, and her mental state made it less than likely that she would get well after she went home. A new admissions algorithm predicted she might have to come back to the hospital soon. So the cardiology and nursing teams at UCM applied a special new protocol on her behalf. They gave Kraniak (a patient invented for this article) a detailed plan to take care of herself—including instructions to eat better, lay off the salt, and try to take a short walk every day—and simplified her medications to help her stay on her regimen and get well more quickly. In the past, hospitals didn’t closely monitor whether patients had to be readmitted shortly after an original hospital visit. If patients returned with the same health issues, they got patched up again, the hospital got paid again, and nobody tracked how many patients made this boomerang trajectory.