Step 1

Biostatistics 1

A 28-year-old man presents to the clinic with complaints of a cough, high fever, myalgias, and fatigue that has persisted for the past 5 days. Many patients have been coming to the clinic with similar symptoms, and the rate of positive influenza tests has been relatively high in the community over the past two weeks. A rapid influenza diagnostic test (RIDT) is ordered and comes back positive. The patient says that he received the flu vaccine this year and doesn't believe the test result. He asks, “How often is the test correct when it comes back positive?” The sensitivity of the test is 50-70%, and the specificity of the test is 90-95%.

Which of the following statements is the most appropriate answer to the patient's question?

  • A) The chance of the test being correct is higher given the prevalence of influenza in the community
  • B) The chance of the test being correct is lower given the prevalence of influenza in the community
  • C) The question cannot be answered with the information provided
  • D) The result is difficult to interpret given the low sensitivity
  • E) The result is most likely correct given the high specificity

Authors

Dr. Ted O'Connell

Christopher Lewis

Editor

Dr. Ted O'Connell

Last updated

May 25, 2022

Source

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