Harmful diagnostic errors may occur for as many as one in every 14 hospital patients receiving medical care, a new study based on a single medical center in the U.S. has found. As many as 85% of these errors may be preventable, highlighting the need for improved surveillance in hospital settings. To explore these findings, a team of researchers led by Brigham and Women's Hospital in Boston randomly selected records from 675 patients admitted to hospital between July 2019 and September 2021.