Research shows diagnostic errors affect more than 12 million Americans each year, and may seriously harm one-third of these patients. Errors in diagnosis are common but they can be difficult to detect, analyze and prevent.

What is diagnostic error?

The National Academies of Science, Engineering, and Medicine defines diagnostic error as the failure to make a correct and timely explanation of a patient’s health problem, regardless of whether or not there is harm, or to communicate that diagnosis to the patient.

The Primary-Care Research in Diagnosis Errors (PRIDE) Learning Network is a local and national effort to improve diagnostic safety. Hosted by the Betsy Lehman Center, it is led by Brigham and Women’s Center for Patient Safety Research and Practice with funding from the Gordon and Betty Moore Foundation.

Through the PRIDE Learning Network, experts confidentially review and discuss diagnostic error cases to identify common pitfalls and lessons learned. These de-identified case studies are free to view and available through our website in an effort to raise clinician awareness and improve patient care.


Case studies

The PRIDE Learning Network aims to educate clinicians and spread awareness through a repository of diagnostic error case studies.

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Submit a case

Are you a primary care provider, patient or health care organization familiar with an instance of missed or delayed diagnosis for a primary care patient?

Submit a case for discussion, or learn more in this FAQ



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About Us

The PRIDE Learning Network includes patient advocates and professionals from more than 20 organizations.

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Read reports about diagnostic error, and learn more about organizations working to improve diagnosis in health care.

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