One concern with blue dye for detecting aspiration is its low sensitivity.

One concern with blue dye for detecting aspiration is its low sensitivity.

• A. High sensitivity
• B. Low sensitivity in detecting aspiration
• C. No effect on detection
• D. It eliminates aspiration

Answer: (B)

The concept being tested is sensitivity—the test’s ability to correctly identify people who actually aspirate. If a method has low sensitivity, many true aspiration events are missed, producing false negatives. In the blue-dye detection approach, aspiration can occur in small amounts or be diluted by saliva and secretions, or the dye may not reach or be visible in the sampled airway material, or the sampling might occur after the dye has cleared. As a result, even when aspiration has happened, the test may not show blue, so negative results don’t reliably rule out aspiration. That’s why the concern is that its sensitivity is low. The other options don’t reflect this limitation: high sensitivity would mean most aspirators are detected; saying there’s no effect or that it eliminates aspiration contradicts how the dye is used and its limitations.

The concept being tested is sensitivity—the test’s ability to correctly identify people who actually aspirate. If a method has low sensitivity, many true aspiration events are missed, producing false negatives. In the blue-dye detection approach, aspiration can occur in small amounts or be diluted by saliva and secretions, or the dye may not reach or be visible in the sampled airway material, or the sampling might occur after the dye has cleared. As a result, even when aspiration has happened, the test may not show blue, so negative results don’t reliably rule out aspiration. That’s why the concern is that its sensitivity is low. The other options don’t reflect this limitation: high sensitivity would mean most aspirators are detected; saying there’s no effect or that it eliminates aspiration contradicts how the dye is used and its limitations.