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If a back extrapolated volume during FVC testing is less than 150 ml, what does this indicate?

The test was invalid

The patient performed well

A back extrapolated volume of less than 150 ml during Forced Vital Capacity (FVC) testing suggests that the patient did not have a significant delay before starting the forced exhalation. This indicates good compliance with the test procedure, where the patient is expected to initiate the expiration immediately after the maximal inspiration, reflecting a well-executed maneuver. A small back extrapolated volume implies that the patient effectively began exhaling without hesitation, which typically correlates with the patient performing well during the test.

In this context, a minimal back extrapolated volume can also enhance the reliability of the FVC results, supporting the notion that the forced expiration was performed correctly and providing a clearer assessment of the patient's lung function.

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The patient hesitated during the test

The patient needs to be recounseled on technique

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