28
NLHEP Quality Checks
In order for the interpretation to be displayed a manoeuvre must pass
a set of enhanced quality checks. After the patient has performed a
poor quality manoeuvre, one of the three following messages will
appear:
Message Criteria Recommended action
Don’t
hesitate
Back-extrapolated volume
(BEV) greater than 150 ml
The patient should blast
out the air more quickly
and evenly and without
hesitation at the
beginning of the
manoeuvre
Blast out
faster
Time until peak flow
(PEFT) greater than 120
msec
The patient must exhale
more explosively at the
beginning of the
manoeuvre
Blow out
longer
Expiration time less than 6
seconds or volume
accumulation has not
dropped below 100 ml per
0.5 seconds
The patient stopped
exhaling too early. The
patient must exhale until
their lungs are completely
empty.
Once an acceptable manoeuvre has been performed, the following
consistency checks will also be applied to subsequent manoeuvres
Blast out
harder
Peak flow not
reproducible. The best
previous manoeuvres do
not match within 1.0 L/sec
indicating that the patient
is giving an inconsistent
effort.
The patient must give
their maximum effort for
each manoeuvre
Deeper
breath
FEV1 or FEV6 not
reproducible. Difference
with respect to best test
greater than 150 ml
The patient must inhale
until their lungs are
completely full before
each manoeuvre
To Next Page
Loading...