The Korean Journal of Clinical Laboratory Science : eISSN 2288-1662 / pISSN 1738-3544

Table 1.

Current criteria for judging acceptability and repeatability

Evaluation item Detailed criteria
Number of measurements Repeat for a minimum of three measurements
Good start Extrapolated volume <5% of FVC or 0.15 L, whichever is greater
Free from artifacts

Cough during the first second of exhalation

Glottis closure that influences the measurement

Early termination or cut-off

Effort that is not maximal throughout


Obstructed mouthpiece

Satisfactory exhalation Duration of ≥6 s or a plateau in the volume–time curve

After three acceptable spirograms have been obtained,

The two largest values of FVC must be within 0.150 L of each otherthe two largest values of FEV1 must be within 0.150 L of each other

Criteria for data that cannot be judged to be acceptable or repeatable

Results without Volume-Time or Flow-Volume curves

Data inconsistent with the results reported to the Ministry of Employment and Labor

Clear result of equipment malfunction

Results of abnormal increase or decrease compared to previous results

Results judged not to be the test result of the examinee

Adopted from Miller et al (Eur Respir J. 2005;26:319-338) [4].

Abbreviations: FVC, forced vital capacity; FEV1, forced expiratory volume in one second.

Korean J Clin Lab Sci 2023;55:276-83
© 2023 Korean J Clin Lab Sci