FeNO Test in Delhi | Fractional Exhaled Nitric Oxide

What is "FeNo"?

The FeNo test (Fractional exhaled Nitric Oxide) is a quick, and simple breathing test which is used to measure the level of inflammation in the airways, particularly due to diseases like eosinophilic asthma or allergic airway. It is commonly used to help diagnose asthma, assess asthma control, and guide treatment decisions. It helps in measuring or diagnosing asthma more accurately, in monitoring asthma control, deciding on medication adjustments, in evaluating the steroid responsiveness. FeNo is particularly valuable in cases where traditional tests like Spirometry are inconclusive or normal, but symptoms like cough, wheezing or breathlessness exist. Since it reflects a real – time airway inflammation, FeNo testing is becoming an important part of personalized asthma management.

Why is the FeNo Test Done?

This test is being conducted by the doctors to:

To diagnose or confirm the eosinophilic asthma.
To identify if the inhaled corticosteroids are needed or affective.
To monitor how well the asthma is controlled by the medications.
To detect the hidden airway inflammation which are not visible on other tests.
For differentiating between the different types of asthma.
To evaluate patients with chronic cough or shortness of breath.

Understanding FeNo levels

Low FeNo (< 25ppb in adults, <20 ppb in children) – Likely no significant inflammation. Asthma may not be the cause.
Intermediate FeNo ( 25- 50 ppb) – Possible mild to moderate inflammation.
High FeNo ( > 50 ppb in adults, > 35 ppb in children) – Suggests eosinophilic inflammation, likely steroid – responsive asthma

How The Test Is Done?

The patient will be asked to inhale deeply, then exhale slowly and steadily into a handled device or machine.
Then the device measures the amount of nitric oxide present in your breath.
This whole process takes less than 5 minutes.
Results are out immediately.

Benefits Of The FeNo Test

It is quick and painless.
There is no blood related or invasive procedures.
It helps in tailoring asthma treatment.
Detects hidden inflammation early.

Limitations Of The Test

FeNo levels may get affected by some factors such as:

One should avoid eating before the test.
Respiratory infections might affect.
Smoking

Frequently Asked Questions (FAQs)

1. Is the FeNo test painful?

No not at all, it’s a completely painless breathing test with no needles or discomfort involved.

2. How long does the test take?

The test usually takes about 5-10 minutes.

3. Do I need to fast before the test?

Fasting isn’t necessary, but it’s best to avoid food, caffeine, or exercise for at least 1 hour before the test.

4. How often should I get a FeNo test?

It depends on your condition. You can be prescribed this during initial diagnosis, before changing medications, or to monitor asthma control overtime. Some patients may need it every few

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