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خرید پکیج
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Grading system for repeatability of FEV1 and FVC (graded separately)

Grading system for repeatability of FEV1 and FVC (graded separately)
Grade Number of
measurements		 Repeatability:
Age >6 years		 Repeatability:
Age ≤6 years*
A ≥3 acceptable Within 0.150 L Within 0.100 L*
B 2 acceptable Within 0.150 L Within 0.100 L*
C ≥2 acceptable Within 0.200 L Within 0.150 L*
D ≥2 acceptable Within 0.250 L Within 0.200 L*
E ≥2 acceptable >0.250 L >0.200 L*
or 1 acceptable N/A N/A
U 0 acceptable and ≥1 usable N/A N/A
F 0 acceptable and 0 usable N/A N/A
The repeatability grade is determined for the set of prebronchodilator maneuvers and the set of post-bronchodilator maneuvers separately. The repeatability criteria are applied to the differences between the two largest FVC values and the two largest FEV1 values. Grade U indicates that only usable but not acceptable measurements were obtained. Although some maneuvers may be acceptable or usable at grading levels lower than A, the overriding goal of the operator must be to always achieve the best possible testing quality for each patient.
FEV1: Forced expiratory volume in one second; FVC: forced vital capacity; N/A: not applicable.
* Or 10% of the highest value, whichever is greater; applies for age 6 years or younger only.
Reprinted with permission of the American Thoracic Society. Copyright © 2020 American Thoracic Society. All rights reserved. From: Graham BL, Steenbruggen I, Miller MR, et al. Standardization of Spirometry 2019 Update. An Official American Thoracic Society and European Respiratory Society Technical Statement. Am J Respir Crit Care Med 2019; 200:e70. The American Journal of Respiratory and Critical Care Medicine is an official journal of the American Thoracic Society.
Graphic 129852 Version 1.0

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