Question 59 (part 2) · LEK · Predictive values
The positive predictive value for the diagnosis of colorectal cancer in the presence of blood in the stool is 5%. This means that:
- A. cancer is present in every 20 patients with this symptom.
- B. it is not justified to continue the diagnosis in the event of such a symptom.
- C. the predictive value will be lower if additional clinical symptoms suggestive of proliferative change are present.
- D. the test’s sensitivity would be lower for more advanced stages of cancer.
- E. colonoscopy is not a better way to detect colorectal cancer.
Hint
PPV is the probability of disease among those with a positive finding; turn 5% into a simple fraction.
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