How many red flags are needed to indicate cervical myelopathy with about 91% sensitivity?

How many red flags are needed to indicate cervical myelopathy with about 91% sensitivity?

• A. 1
• B. 2
• C. 3 or more
• D. 4 or more

Answer: (C)

The test is about using red flags to screen for cervical myelopathy and the sensitivity of that screen. Sensitivity tells us how often the screening rule will identify people who actually have the condition. When you require three or more red flags to consider cervical myelopathy likely, you capture roughly 91% of true cases. In other words, about 9 out of 10 people with cervical myelopathy would be flagged by this criterion, making it a high-sensitivity threshold. Having three or more red flags as the trigger helps avoid missing serious cord pathology, which is crucial in physical therapy screening. If you set the bar lower (one or two red flags), you would catch more people but at the cost of lower specificity, meaning more false positives. If you push the threshold higher (four or more), you’d reduce false positives further but miss more true cases due to lower sensitivity. Thus, three or more red flags strike a practical balance, aligning with the reported ~91% sensitivity for this screening approach.

The test is about using red flags to screen for cervical myelopathy and the sensitivity of that screen. Sensitivity tells us how often the screening rule will identify people who actually have the condition. When you require three or more red flags to consider cervical myelopathy likely, you capture roughly 91% of true cases. In other words, about 9 out of 10 people with cervical myelopathy would be flagged by this criterion, making it a high-sensitivity threshold.

Having three or more red flags as the trigger helps avoid missing serious cord pathology, which is crucial in physical therapy screening. If you set the bar lower (one or two red flags), you would catch more people but at the cost of lower specificity, meaning more false positives. If you push the threshold higher (four or more), you’d reduce false positives further but miss more true cases due to lower sensitivity. Thus, three or more red flags strike a practical balance, aligning with the reported ~91% sensitivity for this screening approach.