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Welch Allyn Schiller SP-1 - Diagnosis Setting American

Welch Allyn Schiller SP-1
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Diagnosis
Diagnosis
Setting
'American'
For
the
USA
and
Canada,
diagnosis
of
possible
respiratory
problems
is
based
on
the
ITS
interpretation
standard
which
uses
the
LLN
(Lower
Limits
of
Normal)
calculations.
These
calculations
apply
to
patients
between
the
ages
of
5
and
85.
The
LLN
FEV1%
value
is
calculated
as
follows:
ill!:
!:
Mate;
Female
Adult
>26
yrs:
Predicted
FEV1%-9.2
>21
yrs;
P
red
icted
FEV1%
-11.1
Adolescent
19
to
25
yrs:
Predicted
FEV1%
x
0.848
19
to
20
yrs:
Predicted
FEV1
%
x
0.805
Child
<18yrs:
Predicted
FEV1%
x
0.826
<18
yrs:
Predicted
FEV1%
x
0.791
Using
this
LLN
value,
the
diagnostic
statements
and
their
criteria
are
as
follows:
Diagnosis
Criteria
Normal
limits
FEV1/FVC%
predicted
is
>80%
Borderline
Obstruction
FEV1/FVC%
is
80
to
100%
of
LLN
Mild
Obstruction
FEV1/FVC%
is
60
to
80%
of
LLN
Moderate
Obstruction
FEV1/FVC%
is
40
to
60%
of
LLN
Severe
Obstruction
FEV1/FVC%
is
<40%
of
LLN
Mild
Restriction
%FVCpredicted
is
60
to
80%
Moderate
Restriction
%FVCpredicted
is
50
to
60%
Severe
Restriction
%FVCpredicted
is
<50%
Page
50
SP-1
User's
Guide

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