Recent updates to spirometry include forced maximal inspiration and new quality criteria, indicating improved accuracy.
Recently, the spirometry procedure for the flow-volume curve has been extended to add a forced complete inspiration after end of expiration, yielding the FIVC. A new acceptability criterion based on FIVC-FVC difference has been added as a quality check. https://bit.ly/44Cqz6v.
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Chhabra et al. (2025) studied this question.
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