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Exhaled Nitric Oxide Test

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Exhaled Nitric Oxide Testing in Charlotte

At Carolina Asthma & Allergy Center, we offer various types of testing around Charlotte to determine what’s causing your symptoms and allergic reactions. Our team of Board-Certified physicians is here to give you the best care possible, and help you return to a sense of normalcy. We will guide you through the exhaled nitric oxide testing process, explain the results, and work with you to develop a personalized management plan that is both effective and convenient.

How to Request an Exhaled Nitric Oxide Test Appointment

At Carolina Asthma and Allergy Center, we provide comprehensive evaluation and treatment for allergies, including exhaled nitric oxide testing. If you suspect you may have swelling or inflammation in your airways, our team of board-certified allergists and experienced healthcare professionals can help.

To schedule an appointment, you can call our office or fill out the online appointment request form on our website. Our friendly staff will work with you to find a convenient date and time for your visit.

During your appointment, our allergists will carefully review your medical history, perform a thorough physical examination, and discuss if an exhaled nitric oxide test is right for you. Our goal is to provide you with the highest quality care and support in addressing your allergies, helping you lead a healthier and more comfortable life.

What is an Exhaled Nitric Oxide Test?

If you have swelling or inflammation in your airways your nitric oxide gas production levels may increase. This test is called a FeNO measurement. This test is a means of figuring out the effectiveness of inhaled steroid treatment as well as the degree of lung inflammation.

How Does an Exhaled Nitric Oxide Test Work?

Fractional concentration of exhaled nitric oxide (FeNO) is measured during an exhaled nitric oxide test. It’s measured as parts per billion or PPB. Your allergist will test with a specialized portable device that can read your exhaled air. You will stand and use a mouthpiece with a tube that connects to a handheld measuring device. Your nurse will coach you to help you give a long steady breath. You should not breathe too quickly or too hard either, as it could lead to incorrect readings. 

What Can I Expect Before and After an Exhaled Nitric Oxide Test?

Have an early breakfast or late lunch, because you shouldn’t eat or drink for 60 minutes ahead of the FeNO testing. You need to notify the allergist if you have smoked or consumed alcohol earlier in the day. Respiratory infections can also influence FeNO levels so discuss with your allergist if you are not feeling well. This is a quick test which is completed in our office during the time of your visit. Afterwards, you can continue your day uninterrupted. 


At Carolina Asthma & Allergy Center, we’re here to help you gain valuable insights into your allergies and take proactive steps towards managing them effectively. Contact one of our Charlotte area locations today to schedule your exhaled nitric oxide testing appointment and embark on your journey to better health. 

Exhaled Nitric Oxide Testing FAQs

How long does exhaled nitric oxide testing take?

It’s a short test, often taking less than ten minutes to complete.

Does insurance pay for exhaled nitric oxide tests?

It depends on the policy. At Carolina Asthma & Allergy Center, we’re happy to help you navigate the insurance process. Prior to your visit, we will reach out to your insurance company to determine if your health insurance policy covers exhaled nitric oxide testing. We’ll create cost estimates to avoid any billing surprises for you when it’s time to make test or treatment decisions. Every step of the way, we support you in making a confident, educated decision about your care. 

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