|
Table 6: Classification of quality control. |
|||
|
Quality |
VIN/FVC (%) |
TA |
Sample collection time* (seconds) |
|
A |
≥ 90‡ |
8-12 s |
≤ 4 |
|
B |
≥ 85 |
8-12 s |
≤ 4 |
|
C |
≥ 80 |
8-12 s |
≤ 5 |
|
D |
≤ 80 |
< 8 o > 12 s |
≤ 5 |
|
F |
≤ 80 |
< 8 o > 12 s |
> 5 |
|
Quality A: meets all acceptability criteria. Report the average DLCOsb of two repeatable quality A maneuvers. |
|||
|
Unsuccessful repetition (if two repeatable quality A maneuvers are not obtained): |
|||
|
1. Two or more maneuvers A not repeatable, but acceptable: Report the average DLCOsb of those acceptable maneuvers 2. Only one maneuver A is obtained: Report the DLCOsb value of that maneuver 3. Maneuvers A are not obtained: report the average DLCOsb of the maneuvers with grades B, C or D 4. Only F maneuvers are obtained: Do not report any DLCOsb value |
|||
|
Note: In each of these situations, these deviations from the acceptability criteria should be noted to alert the interpreter of the test results. DLCOsb = single-breath pulmonary diffusion of carbon monoxide. FVC = forced vital capacity. TA = apnea time. VA = alveolar volume. VIN = inspired volume. * Only in classic analyzers, in fast response analyzers it is necessary to reach the residual volume with a maximum of 12 seconds. ‡ VIN/FVC ≥ 85% and alveolar volume within 200 mL or 5% (whichever is greater) of the largest VA of another acceptable maneuver. |
|||