A Comparison of Functional Residual Capacity Measured by Body Plethysmography

A comparison of functional residual capacity measured by body plethysmography with that measured by nitrogen washout reveals that the measurement obtained during the nitrogen washout test is less than that during body plethysmography.This discrepancy is most likely caused by which of the following?

A) Poor technique
B) Severe air-trapping
C) Restrictive lung disease
D) Directional valve malfunction

Correct Answer:

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