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Table 3.

Grading system for FEV1 and FVC

No. of acceptable measurement Repeatability Grade Score
3 Within 150 mL A 5
2 Within 150 mL B 4
2 Within 200 mL C 3
2 Within 250 mL D 2
2 >250 mL E 1
1 N/A
0 & ≥1 usable N/A U 0
0 & 0 usable N/A F 0

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; N/A, not applicable.

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