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Showing 1–24 of 47 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Exhaled Nitric Oxide Clear all
Completed Not applicable Interventional

Home Air in Agriculture: Pediatric Intervention Trial

NCT04919915
View directory record Official record
Conditions
Asthma in Children
Interventions
HEPA air cleaner
Device
Lead sponsor
University of Washington
Other
Eligibility
6 Years to 12 Years
Enrollment
71 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Yakima, Washington
Source: ClinicalTrials.gov public record
Updated Jun 8, 2021 · Synced Jul 23, 2026, 7:41 AM EDT
Recruiting No phase listed Observational

Use of fenoTRACK Device for Monitoring Changes of Fractional Exhaled Nitric Oxide (FeNO) in Uncontrolled Asthma Subjects and Controlled Asthma Subjects

NCT07228026
View directory record Official record
Conditions
Asthma
Interventions
fenoTRACK Device
Device
Lead sponsor
Biometry Inc
Industry
Eligibility
5 Years to 100 Years
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
13
States / cities
Stockton, California • Panama City, Florida • Columbus, Georgia + 10 more
Source: ClinicalTrials.gov public record
Updated Jun 1, 2026 · Synced Jul 23, 2026, 7:41 AM EDT
Active, not recruiting Phase 4 Interventional

FeNO as a Marker of Allergic Reactions to OFC and Response of OMA Treatment in Multiple FA

NCT06437171
View directory record Official record
Conditions
Food Allergy
Interventions
Omalizumab
Biological
Lead sponsor
AAADRS Clinical Research Center
Other
Eligibility
6 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Coral Gables, Florida
Source: ClinicalTrials.gov public record
Updated Aug 13, 2025 · Synced Jul 23, 2026, 7:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nitrate Supplementation During Final Examination Stress

NCT03159273
View directory record Official record
Conditions
Airway Disease
Interventions
Beetroot Juice Group
Dietary Supplement
Lead sponsor
Southern Methodist University
Other
Eligibility
18 Years to 50 Years
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated May 22, 2018 · Synced Jul 23, 2026, 7:41 AM EDT
Completed No phase listed Observational

The Use of Fractionated Exhaled Nitric Oxide in the Diagnosis and Assessment of Disease Activity of Eosinophilic Esophagitis (Validation Phase)

NCT04941742
View directory record Official record
Conditions
Eosinophilic Esophagitis
Interventions
Not listed
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
5 Years to 18 Years
Enrollment
71 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 9, 2024 · Synced Jul 23, 2026, 7:41 AM EDT
Terminated Phase 4 Interventional

Management of Asthma Patients Guided by Exhaled Nitric Oxide (eNO)

NCT00739219
View directory record Official record
Conditions
Asthma
Interventions
Apieron Insight eNO monitor
Device
Lead sponsor
Apieron
Industry
Eligibility
12 Years and older
Enrollment
260 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
12
States / cities
Mission Viejo, California • San Jose, California • Glastonbury, Connecticut + 9 more
Source: ClinicalTrials.gov public record
Updated Jan 20, 2009 · Synced Jul 23, 2026, 7:41 AM EDT
Completed No phase listed Observational

The Use of Fractionated Exhaled Nitric Oxide in the Diagnosis and Assessment of Disease Activity of Eosinophilic Esophagitis (Pilot)

NCT03812575
View directory record Official record
Conditions
Eosinophilic Esophagitis
Interventions
Not listed
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
5 Years to 18 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 9, 2024 · Synced Jul 23, 2026, 7:41 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Determination of Variances in Exhaled Nitric Oxide Output in Normal Healthy Male Volunteers Consuming High and Low Nitrate/Nitrite Diets

NCT00027157
View directory record Official record
Conditions
Healthy
Interventions
Not listed
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
Male only
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2000 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Jul 23, 2026, 7:41 AM EDT
Completed No phase listed Observational

Exhaled Nitric Oxide and Airway Caliber in Children With Asthma

NCT01645397
View directory record Official record
Conditions
Asthma in Children
Interventions
Not listed
Lead sponsor
Atlantic Health System
Other
Eligibility
6 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Morristown, New Jersey
Source: ClinicalTrials.gov public record
Updated Jan 15, 2014 · Synced Jul 23, 2026, 7:41 AM EDT
Completed Phase 2 Interventional Results available

L-arginine in Severe Asthma Patients Grouped by Exhaled Nitric Oxide Levels

NCT01841281
View directory record Official record
Conditions
Asthma, Inflammation
Interventions
L-Arginine, Placebo
Drug
Lead sponsor
Nicholas Kenyon
Other
Eligibility
19 Years and older
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2019
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Apr 20, 2020 · Synced Jul 23, 2026, 7:41 AM EDT
Completed No phase listed Observational

Exhaled Nitric Oxide as a Biomarker of Disease Activity in Eosinophilic Esophagitis

NCT01170234
View directory record Official record
Conditions
Eosinophilic Esophagitis
Interventions
NIOX MINO® Airway Inflammation Monitor
Device
Lead sponsor
Tufts Medical Center
Other
Eligibility
7 Years to 65 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 15, 2019 · Synced Jul 23, 2026, 7:41 AM EDT
Terminated No phase listed Observational

Evaluation of FeNO During and Following Acute COPD Exacerbation

NCT01761006
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
NIOX MINO®
Device
Lead sponsor
Wake Forest University
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 6, 2017 · Synced Jul 23, 2026, 7:41 AM EDT
Completed No phase listed Observational

Exhaled NO as a Biomarker of Gestational OSA and Persistence Postpartum

NCT02100943
View directory record Official record
Conditions
Pregnancy, OSA
Interventions
Not listed
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 19, 2017 · Synced Jul 23, 2026, 7:41 AM EDT
Not listed Phase 2 Interventional Accepts healthy volunteers

Beetroot Juice NO Cold Study

NCT06416228
View directory record Official record
Conditions
Respiratory Tract Infections, Cold Symptoms, Exhaled Nitric Oxide
Interventions
Beetroot juice
Dietary Supplement
Lead sponsor
Southern Methodist University
Other
Eligibility
18 Years to 30 Years
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
2
States / cities
Dallas, Texas • Waco, Texas
Source: ClinicalTrials.gov public record
Updated May 15, 2024 · Synced Jul 23, 2026, 7:41 AM EDT
Withdrawn No phase listed Observational

Oral Contraceptives and Asthma Control

NCT00662051
View directory record Official record
Conditions
Asthma, Regulatory T Cell Function
Interventions
Not listed
Lead sponsor
University of Kentucky
Other
Eligibility
18 Years to 45 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Aug 8, 2013 · Synced Jul 23, 2026, 7:41 AM EDT
Completed Not applicable Interventional Results available

Dietary Supplementation With Soy Isoflavones in Asthma

NCT00277446
View directory record Official record
Conditions
Asthma
Interventions
Soy isoflavones
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 50 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Feb 24, 2011 · Synced Jul 23, 2026, 7:41 AM EDT
Completed No phase listed Observational

Phase II Evaluation of Exhaled Nitric Oxide (NO)

NCT01392144
View directory record Official record
Conditions
Lung Cancer
Interventions
Nitric oxide breath test, Questionnaires
Procedure · Behavioral
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 3, 2013 · Synced Jul 23, 2026, 7:41 AM EDT
Not listed Phase 1 Interventional

Effects of Anticholinergic or Long-Acting Beta 2 Agonist on FeNO and Pulmonary Function in SCI

NCT01355991
View directory record Official record
Conditions
Spinal Cord Injury
Interventions
Tiotropium, Salmeterol
Drug
Lead sponsor
James J. Peters Veterans Affairs Medical Center
Federal
Eligibility
18 Years to 65 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
2
States / cities
West Orange, New Jersey • The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Oct 22, 2015 · Synced Jul 23, 2026, 7:41 AM EDT
Completed Phase 4 Interventional

Mometasone and Markers of Airway Inflammation

NCT00711165
View directory record Official record
Conditions
Asthma
Interventions
Placebo, Mometasone Furoate
Drug
Lead sponsor
Creighton University
Other
Eligibility
19 Years to 50 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2006
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Jul 7, 2008 · Synced Jul 23, 2026, 7:41 AM EDT
Completed Phase 4 Interventional

Non-invasive Ways to Evaluate Lung Disease After Treatment With Xolair

NCT00139152
View directory record Official record
Conditions
Lung Disease
Interventions
Placebo, Xolair
Drug
Lead sponsor
Creighton University
Other
Eligibility
12 Years and older
Enrollment
65 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
2
States / cities
Omaha, Nebraska • Albany, New York
Source: ClinicalTrials.gov public record
Updated Jan 6, 2014 · Synced Jul 23, 2026, 7:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Utilizing Exhaled Breathe Condensate Collection to Study Ion Regulation in Cystic Fibrosis

NCT01880723
View directory record Official record
Conditions
Cystic Fibrosis, Healthy
Interventions
Albuterol, Placebo saline
Drug
Lead sponsor
University of Arizona
Other
Eligibility
15 Years to 55 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2013
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 28, 2023 · Synced Jul 23, 2026, 7:41 AM EDT
Terminated No phase listed Observational

The Use of Exhaled Nitric Oxide in Conjunction With the Asthma Control Test to Determine Asthma Control in Pediatric Patients

NCT00575445
View directory record Official record
Conditions
Asthma
Interventions
Not listed
Lead sponsor
Akron Children's Hospital
Other
Eligibility
6 Years to 18 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2015
U.S. locations
1
States / cities
Akron, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 24, 2015 · Synced Jul 23, 2026, 7:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of an Asthma Treatment Strategy Based on Exhaled Nitric Oxide Measurements in Adolescents

NCT00114413
View directory record Official record
Conditions
Asthma
Interventions
Inhaled corticosteroids, eNO measurement
Drug · Procedure
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
12 Years to 20 Years
Enrollment
547 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2006
U.S. locations
12
States / cities
Tucson, Arizona • Denver, Colorado • Washington D.C., District of Columbia + 9 more
Source: ClinicalTrials.gov public record
Updated Feb 9, 2017 · Synced Jul 23, 2026, 7:41 AM EDT
Completed Phase 4 Interventional

Effect of Budesonide on Exhaled Nitric Oxide in Asthmatic Children

NCT00522782
View directory record Official record
Conditions
Asthma
Interventions
Nebulized Budesonide, Nitric Oxide Analyzer
Drug · Device
Lead sponsor
AAADRS Clinical Research Center
Other
Eligibility
4 Years to 6 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Coral Gables, Florida
Source: ClinicalTrials.gov public record
Updated Jan 22, 2009 · Synced Jul 23, 2026, 7:41 AM EDT