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6.3.1 QC Tester qualification
For the tester qualification, you have to meet the following criteria:
• Over 18 years of age.
• No ongoing cold or known airway disease.
• Non-smoker.
• Expected stable FeNO values below 50 ppb.
To qualify as tester, you must complete the following steps:
• Perform 4 measurements within 7 days, not more than one qualification measurement per day.
• The QC-measurement on the fourth day must be within accepted range of 5 ppb ± 3 x standarddeviation, at least ± 3 ppb
from the mean value.
The moving mean value is recalculated when the QC tester performs a new QC-measurement within
7 days.
The qualification of a QC tester expires after 30 days. Then the qualification is suspended and the
QC tester needs to qualify again, according to the qualification procedure.
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