GE Analytical Instruments ©2006 7-7 DML 14291 Rev. A
Figure 7-6: Flow/Pressure Calibrations for Restrictors
12) in which the difference between the [NO] at the beginning and the [NO] at the
end of the interval varies by < 10% (based on the lowest [NO]). At no time during
the interval should the [NO] exceed the maximum NO at the beginning or end. For
exhaled NO levels < 5 ppb, the beginning and end NO values should not differ by
more than 1 ppb.
The REB program uses these criteria to select the value for the NO plateau. Three
exhalation profiles can be observed; constant NO versus time, increasing NO versus
time and decreasing NO versus time.
For increasing NO plateaus, the end [NO] minus the beginning [NO] divided by the
beginning [NO] must be < 10%, the [NO] during the interval must be less than the
end [NO] and the end [NO] is selected as the exhaled NO value.
For decreasing NO plateaus, the beginning [NO] minus the end [NO] divided by the
end [NO] must be < 10%, the [NO] during the interval must be less than the
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