At least one in 20 adults is misdiagnosed in outpatient clinics in the U.S. every year, amounting to 12 million people nationwide, and posing a 'substantial patient safety risk,' finds research. Half of these errors could be potentially harmful, say the authors, who add that their findings should prompt renewed efforts to monitor and curb the numbers of misdiagnoses.

Source: At least one in 20 adult outpatients misdiagnosed in U.S. every year