8 min read
FENO Test: What It Measures, Normal Range & Price in India
Your doctor may have called it a breathing test, but it is likely different from any you have done before. You might have been managing what feels like asthma for a while, or perhaps someone finally mentioned "eosinophilic inflammation," leaving you to wonder what that means for your daily life.
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Key Highlights
- What it is: FENO stands for Fractional Exhaled Nitric Oxide, a quick measure of airway inflammation linked to allergic asthma.
- Simple Process: The test is non-invasive and takes minutes; you simply breathe steadily into a handheld or desktop analyser.
- Accuracy You Can Trust: All tests are conducted at NABL-accredited partner labs, which means the facility has undergone rigorous government auditing to ensure technical competence and machine calibration.
- No Guesswork: Normal levels are generally below 25 ppb, while values above 50 ppb indicate significant inflammation.
- Actionable Results: Findings help doctors decide if inhaled corticosteroids (ICS) are likely to work for you.
- Expert Support: Access a pulmonologist through Visit Health typically within 60 minutes of receiving your report.
What is the FENO test?
FENO measures the concentration of nitric oxide in your exhaled breath, expressed in parts per billion (ppb). Nitric oxide is produced by cells lining your airways in response to inflammation, specifically when eosinophils, a type of white blood cell linked to allergies, are active.
we see that most just want to know if their treatment is actually working. The FENO test captures a biological signal directly from your breath, giving doctors a "window" into your airway walls.
You select the test in the Visit app, find a nearby accredited respiratory center in Bengaluru, and confirm your slot. Because we know your schedule can change, we provide a 2-hour rescheduling window to build operational trust and keep your experience stress-free.
Where to do the FENO Test?
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Because the FENO test requires a specialized, calibrated breath-analyzer machine, home collection is not available. You must visit a physical facility.
Visit Clinic Bengaluru: You can book through the Bengaluru Lab Test page.
Partner Lab Network: You have access to 40+ NABL-accredited partner labs and over 1,000+ diagnostic centres across Bengaluru (including areas near Marathahalli, Outer Ring Road, and beyond).
HOW to book and perform the test?
The process follows the verified 4-step booking flow:
Step 1: Search & Select
Go to the Visit Clinic Bengaluru page and search for "FENO" or "Exhaled Nitric Oxide." Add the test to your cart. You will see the up to 50% discount applied automatically.
Step 2: Choose Your Lab
Since this test is "Centre Visit" only, select a preferred diagnostic center from the list of 40+ Bengaluru partners that are closest to your location.
Step 3: Schedule & Pay
Select your preferred date and time slot. Complete the payment. You will receive a booking confirmation within 2 hours.
Step 4: The Test Day
Arrive at the center at your scheduled time. The test is non-invasive:
You will be asked to exhale steadily into a handheld device for about 10 seconds.
The device measures the nitric oxide levels in your breath instantly.
Exhaled nitric oxide concentration
The test measures how much nitric oxide you exhale at a steady flow rate. It is a precise molecular measurement, much like how a Troponin panel acts as a sensitive "alarm" for heart muscle stress, or how imaging, like an MRA or CECT provides a highly detailed visual map of your blood vessels and organs. FENO provides a similar level of "insider detail" for your lungs without any needles or discomfort.
Eosinophilic airway inflammation
A high FENO reading is a proxy for eosinophilic inflammation. What patients in Bengaluru tell us most often is that they are tired of "trial and error" with inhalers. This test helps end that by showing if the type of inflammation you have is the kind that typically responds to steroid treatments.
Steroid responsiveness prediction
If your FENO levels are high, you are much more likely to see clinical improvement from inhaled corticosteroids. Conversely, if symptoms persist but your FENO is low, the inflammation might not be eosinophilic, and your doctor may need to look at a different therapeutic approach.
Adherence and exposure tracking
Because FENO levels drop relatively quickly when medication is taken consistently, it is a great way to monitor treatment adherence. It can also flag if you've been exposed to allergens or pollution, a common concern in busy metros, before you even start feeling symptoms.
Normal range for the FENO test
Patients often ask us whether home collection is available for this test. Home collection is not currently available for FENO because the test requires you to breathe into a specialised, calibrated analyzer that must remain in a controlled lab environment. However, our Bengaluru network makes it easy to find a nearby accredited facility
What do abnormal results mean?
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A high reading (above 50 ppb) supports a diagnosis of allergic asthma and suggests that your current treatment might need adjustment or that you aren't using your inhaler as prescribed. However, a low reading doesn't necessarily mean you are "cleared." Non-eosinophilic asthma or even smoking (which lowers FENO) can mask the results.
The difference between a good diagnostic experience and a frustrating one comes down to nuance. Our Smart Reports frame these numbers within your broader health history, explaining what the value means for you rather than just giving you a generic range.
Important Preparation (How to get accurate results)
To ensure your FENO reading is accurate, follow these "Rules of Hours":
- 1 Hour Before: Do not smoke or engage in strenuous exercise.
- 2 Hours Before: Avoid nitrate-rich foods (like spinach, beetroot, celery, or leafy greens) and caffeinated drinks.
After the Test
- Reports: Your digital report will be available in the app within 6 to 24 hours.
- Consultation: Once your report is ready, you can use the Visit app to connect with a pulmonologist (specialist) to discuss the findings.
- Flexibility: If you need to change your plans, you can reschedule or cancel your appointment up to 2 hours before your scheduled slot.
Why Visit Health for this test
With over 80 lakh patients served, we understand that a lab result is just the start.
- NABL-Accredited Accuracy: We partner with 40+ NABL-accredited labs in Bengaluru and a network of 1,000+ diagnostic centers to ensure your test is performed on calibrated machines with standardized techniques.
- Contextual Smart Reports: We don't just give you a PDF. We show you how your results trend over time, which is vital for managing chronic asthma.
- Pulmonologist Access: If your result is high, you can consult a specialist, typically within 60 minutes, via the app.
- Reliable Support: Our NPS score of 78+ reflects our commitment to making the diagnostic journey faster and less stressful than the industry standard.
Conclusion
The FENO test is a powerful, non-invasive tool to help you take control of your asthma. To get the most accurate result, remember to follow the prep: no smoking or strenuous exercise for an hour, and no nitrate-rich foods (like leafy greens) for two hours before the test. When your report arrives in 6 to 24 hours, use it as a bridge to a better conversation with your doctor.
Frequently Asked Questions (FAQs)
1. What is the FENO test used for?
It measures airway inflammation to help diagnose asthma, predict if steroids will work, and monitor how well you are managing your condition.
2. How do I book an FENO test in Bengaluru?
Visit the Visit Clinic Bengaluru page, search for "FENO test," and select a nearby accredited facility.
3. Do I need to prepare before the FENO test?
Yes. Avoid smoking, exercise, and nitrate-rich foods (like beetroot or spinach) in the hours before the test to ensure an accurate reading.
4. What does a high FENO result mean?
Values over 50 ppb indicate significant inflammation and suggest you may benefit from (or need a higher dose of) inhaled corticosteroids.
5. Are Visit Health Labs NABL-accredited in Bengaluru?
Yes. All our partner labs meet strict NABL standards, which is essential for the technical precision required for breath analysis.
6. Can I consult a doctor after getting my FENO results?
Absolutely. You can connect with a pulmonologist via telemedicine within 60 minutes of receiving your report through the app.
7. Is the FENO test covered under corporate health benefits?
Many corporate plans with Visit Health include specialised diagnostics under cashless OPD benefits. Check your specific plan in the app.
8. How is a Smart Report different from a standard lab report?
A standard report is just a number. A Smart Report explains the clinical meaning, tracks your history, and provides actionable insights.
9. How long does it take to get results?
Reports are typically delivered directly to your app and registered contact details within 6 to 24 hours of the test.
10. Why choose Visit Health over a local diagnostic center?
Many local labs don't have the specialised equipment for FENO. We provide access to accredited centres combined with AI-driven reports and immediate specialist follow-up.
“Book your FENO test at a NABL-accredited lab near you with GetVisit Clinic. Get results in 6–24 hours with expert pulmonologist support.”
Corporate packages available.- Pan-India coverage
- GST-ready billing
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