Respiratory Volumes

Question

Which volume cannot be measured by a spirometer?

RankGuru · Accepted Answer

1. **Spirometry**: A clinical test used to measure volumes of air inhaled and exhaled.
2. **Measurable Volumes**: Tidal Volume ($TV$), IRV, and ERV can all be exhaled into the device.
3. **Non-measurable Volume**: **Residual Volume ($RV$)** is the amount of air remaining in the lungs even after a forceful expiration. Since it never leaves the lungs, it cannot be measured by a spirometer.
4. **Capacities**: Consequently, capacities containing $RV$ (like FRC and TLC) also cannot be measured directly.
5. **Conclusion**: Residual Volume cannot be measured by spirometry.

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