During inspection of a bag-valve-mask, which statement indicates the pop-off valve is functioning properly?

• A. It remains stiff and does not move
• B. It vents at any pressure, including zero
• C. It never vents regardless of pressure
• D. It moves freely and vents when the pressure threshold is reached

Answer: (D)

The key idea is that the pop-off valve protects the patient by venting excess pressure, but only when that pressure reaches a safe, designed level. A properly functioning valve should move freely and vent when the bag-valve-mask reaches that threshold. If it stays stiff and won’t move, it can’t relieve pressure and may cause dangerous high pressures. If it vents at any pressure, including zero, it’s open too much and you’ll lose the delivered ventilation. If it never vents, pressure can build to unsafe levels. Therefore, venting only at the set pressure threshold while remaining free to move indicates correct function.