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second, weak expiratory push, and early terminations could cause
unacceptability of the test result.
However, following condition shall be assessed when evaluate the tests:
Cough during the initial second
Glottis closure
Effort that is not maximal throughout
Mouth piece air leaking
Mouthpiece obstructed by tongue or foreign body
3.8 Test Repeatability
Three acceptable curves in a well-performed test usually have repeatable shapes
and consistent results among the maneuvers. Evaluation of the consistency or
“repeatability” of the measurements is the final step in determining whether a
test is valid and complete. Values for FVC and FEV1 are considered repeatable
when the largest FVC minus the second largest FVC and the largest FEV1 minus
the second largest FEV1, taken from acceptable curves, are both 0.15 L (150 ml)
and less.
Lack of repeatability is often caused by failing to inhale maximally before each
maneuver. Repeatable results can be recorded by most healthy subject when
they consistently exert a maximal effort for each maneuver attempted, and every
effort should be made to record a valid test. However, subject with airway
obstruction sometimes have difficulty achieving repeatability, and as a result,
non-repeatable test results should not be excluded from interpretation. Failure to
achieve repeatability should be documented and considered during
interpretation of results.
3.9 Interpreting Test Result
The three key spirometry measurements (the FVC, FEV1 and FEV1/FVC ratio) for
a given individual are compared to reference values. The reference value is based
on healthy individuals with normal lung function, and it tells the doctor the
values that would be expected for someone of the same sex, age and height. To
find the reference value on your spirometry report, look for the column marked
“Predicted” value on the screen.
3.10 Print Test Report
UBREATH® PRO
Spirometer System enables you to print any test performed and
stored in the archive.
To print the testing results stored in the archive, simply tap on the corresponding
test parameters then press
to print.
