Final answer:
The normal range of exhaled nitric oxide for adults is typically 25 ppb or less, with 35-40 ppb being the upper limit of normal. Values vary depending on testing methods and the population. Monitoring FeNO is used in managing respiratory conditions such as asthma.
Step-by-step explanation:
The upper limit of normal cutoff for exhaled nitric oxide (FeNO) in adults is helpful in the diagnosis and management of asthma and other respiratory conditions. According to the National Heart, Lung, and Blood Institute, the normal range for exhaled nitric oxide for adults is 25 parts per billion (ppb) or less.
A level of 35-40 ppb might be considered the upper limit of normal for adults, but it is important to note that values can vary depending on the testing methods and the population being tested. Monitoring exhaled nitric oxide can aid in assessing asthma control and determining the need for anti-inflammatory treatment.
Breathing air with a high concentration of NO₂ can cause health effects such as irritation in the airways, aggravating respiratory diseases, and possibly contributing to the development of asthma.
It's important to consider environmental and health safety standards, which outline acceptable levels of NO₂ exposure. For example, the level of the annual NO₂ standard is 0.053 ppm, which is considered safe for the general public.