NDD easyone pro - Page 92

Quality Messages and Quality Grades
92 EasyOne Pro™ / EasyOne Pro™ LAB
DLCO Acceptability and Quality Grades
Currently, there are not standardized quality grades for DLCO tests. These
are the quality grades implemented in EasyOne Pro™ LAB:
1)
referring to the two nearest values
The following parameters determine the score and quality grades:
 DLCO variability as a percentage and as an absolute value
 number of accepted trials.
Trials that fulfill the following criteria are accepted:
 VCin >80 % VCtarget
 breath hold time (BHT) 8.0 to 12.0 s
 inspiratory time <4 s
 sample volume >0.1 L.
Legend
VCin as a percentage of VCtarget: Inspired volume as a
percentage of FVC, VC from a previous test. If none of these is
available, the target value is taken from the test itself.
BHT: Breath-hold time in seconds.
Sample Volume: Sampling volume for CO and helium
measurement (also called collection window). The sampling
volume will be outside this window only under special
circumstances (e.g. for very small VCs).
Inspiratory time in seconds.
The quality grades are recomputed if the user manually
changes the sampling window position (repositioning of the
collection bar).
Quality Grade Accept. Trials DLCO Variability
1)
A>=2<1 ml/min/mmHg
B>=2<
2 ml/min/mmHg
C>=2<
3 ml/min/mmHg
D1 or
>=2 >3 ml/min/mmHg
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