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Editor's Note |

Ensuring Correct Interpretation of Diagnostic Test Results

Joseph S. Ross, MD, MHS
JAMA Intern Med. 2014;174(6):993. doi:10.1001/jamainternmed.2014.165.
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Today, physicians order a wide array of diagnostic laboratory and imaging tests for their patients, including genetic evaluations. To make sense of the growing number of diagnostic testing opportunities, one might expect that physicians, in turn, have grown in their ability to accurately interpret test results. The Research Letter by Manrai and colleagues1 finds this not to be the case. They replicated a classic study and found that only 23% of physicians and physicians-in-training correctly answered a single question testing their interpretation of a diagnostic test result. While this study was limited to a convenience sample from a single academic teaching hospital, it is not too far out on a limb to suggest that today’s physicians need to be better prepared to interpret diagnostic test results, including stronger training in statistics and clinical epidemiology.

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The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
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Submit a Comment
The culture of \"Rule Out\"
Posted on April 22, 2014
J. David Spence
Robarts Research Institute, Western University
Conflict of Interest: None Declared
The problem, as intimated by Dr. Ross, is the culture of \"rule out\". I well remember my experiences with the phenomenon of \"the workup\" as a visiting medical student at Jackson Memorial Hospital in Miami, and then as a Fellow in Clinical Pharmacology at Moffitt Hospital at UCSF. I was amazed at the concept of \"the workup\", which was an exhaustive list of investigations that would be ordered in all patients presenting with a given problem. The question from the attending or chief resident would be \"What is the workup for (condition X)?\", and the \"correct\" answer from the student or junior resident would be a long list of investigations, most of which were not indicated. In the more British system in which I was educated in Canada, and which I hope persists, at least to some degree, a diagnosis is approached by \"a thorough history and physical examination, and judicious use of laboratory investigations\". In that context, the pretest probability is much higher than when a shotgun blast of investigations is thrown at the patient, hoping that one might hit the tiny target
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