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If the maximal inspiration after EOFE is greater than FVC, then
(FIVC — FVC) must be
≤
0.100 L or 5% of FVC, whichever
is greater
**
Yes
Yes
No
No
Repeatability criteria
(applied to acceptable FVC and FEV
1
values)
Age > 6 yr: The difference between the two largest FVC values must be
≤
0.150 L, and the
difference between the two largest FEV
1
values must be
≤
0.150 L
Age
≤ 6 yr: The difference between the two largest FVC values must be
≤
0.100 L or 10% of the
highest value, whichever is greater, and the difference between the two largest
FEV
1
values must be
≤
0.100 L or 10% of the highest value, whichever is greater
EOFE = end of forced expiration
* Occurs when the patient cannot expire long enough to achieve a plateau (e.g., children
with high elastic recoil or patients with restrictive lung disease) or when the patient inspires
or comes off the mouthpiece before a plateau. For within-maneuver acceptability, the FVC
must be greater than or within the repeatability tolerance of the largest FVC observed before
this maneuver within the current prebronchodilator or the current post-bronchodilator testing
set.
** Although the performance of a maximal forced inspiration is strongly recommended, its
absence does not preclude a maneuver from being judged acceptable, unless extrathoracic
obstruction is specifically being investigated.
Grading System for FEV
1
and FVC
(Graded Separately)
Grade
Number of Measurements
Repeatability:
Age >6 yr
Repeatability:
Age ≤6 yr *
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
NA
NA
U
0 acceptable AND ≥ 1 usable
NA
NA
F
0 acceptable and 0 usable
NA
NA
*
Or 10% of the highest value, whichever is greater; applies for age 6 years or younger only.
NA:
Not Applicable
First Pub. Date: 24.09.2018
R.9-1 / 10.03.2020
