CNA Certification (Written Exam)Infection Control and SafetyHard
A nurse aide is assigned to care for a resident with confirmed active tuberculosis. Before entering the room wearing an N95 respirator, what must the aide do to ensure the mask is providing adequate protection?
- ACheck the expiration date printed on the box only
- BPerform a seal check by inhaling and exhaling to detect air leaks
- CWear the mask loosely to allow easier breathing
- DSpray the mask with disinfectant before each use
Show answer & explanationAnswer & explanation
Correct answer: B. Perform a seal check by inhaling and exhaling to detect air leaks
A seal check (also called a fit check) involves inhaling and exhaling sharply while wearing the N95 to detect air leaking around the edges, ensuring a proper seal against airborne pathogens like TB. This step is essential every time the respirator is worn.
Why the other options are wrong
- A. Incorrect; expiration date doesn't confirm proper fit at time of use.
- C. Incorrect; a loose fit allows unfiltered air to bypass the mask, defeating its purpose.
- D. Incorrect; N95 masks are not designed to be disinfected and reused this way, and disinfectant spray does not confirm fit.
N95 Seal Check
A seal check involves inhaling and exhaling to detect air leaks, confirming the N95 respirator fits properly before entering an airborne precaution room.
- Performed every time the mask is donned
- Detects gaps around nose and edges of mask
- Essential for airborne precautions like TB
Memory trick: Breathe in, breathe out — feel for the leak before you're about.