What is the Upper Limit of Normal Cutoff for Exhaled

Question

What is the upper limit of normal cutoff for exhaled nitric oxide in adults?
A) 15 ppb
B) 25 ppb
C) 35 ppb
D) 45 ppb

Accepted Answer

The upper limit of normal cutoff for exhaled nitric oxide in adults is generally considered to be 35 parts per billion (ppb). This value is used as a marker of airway inflammation, particularly in the management of asthma.