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Table 2.

New acceptability criteria

Detailed criteria Required for acceptability
FEV1 FVC
Must have BEV ≤5% of FVC or 0.100 L, whichever is greater
Must have no evidence of a faulty zero-flow setting
Must have no cough in the first second of expiration ×
Must have no glottic closure in the first second of expiration
Must have no glottic closure after 1 s of expiration ×
Must achieve one of these two EOFE indicators① Expiratory plateau (≤0.025 L in the last 1 s of expiration)② If not satisfied with ① expiratory time ≥15 s ×
Must have no evidence of obstructed mouthpiece or spirometer
Must have no evidence of a leak
FIVC-FVC must be ≤0.100 L or 5% of FVC, whichever is greater

Adopted from Graham et al (Am J Respir Crit Care Med. 2019;200:e70-e88) [15].

Abbreviations: FEV1, forced expiratory volume in one second; FVC, forced vital capacity; BEV, back-extrapolated volume; EOFE, end of forced expiration; FIVC, forced inspiratory vital capacity.

Korean J Clin Lab Sci 2023;55:276-83 https://doi.org/10.15324/kjcls.2023.55.4.276
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