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ClinicalTrials.gov public records Last synced Oct 22, 2026, 3:37 AM EDT

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Showing 1–24 of 332 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Breath Test Clear all
Not yet recruiting Not applicable Interventional

Inhaled Nitric Oxide in Severe Obesity

NCT06675435
View directory record Official record
Conditions
Obesity, Respiratory Insufficiency, Hypoxemic Respiratory Failure, Nitric Oxide
Interventions
Nitric oxide
Device
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 20, 2026 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Phase 3 Interventional Results available

Weight Loss in Parkinson's Disease and Role of Small Bowel Bacterial Overgrowth

NCT01662791
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Rifaximin
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Aug 4, 2016 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Phase 4 Interventional Results available

Preterm Infant Inhaled Albuterol Dosing

NCT02447250
View directory record Official record
Conditions
Bronchopulmonary Dysplasia, Very Low Birth Weight
Interventions
Varied albuterol dose response
Drug
Lead sponsor
Oregon Health and Science University
Other
Eligibility
14 Days and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated May 23, 2019 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Not applicable Interventional

Contingency Management for Smoking Cessation in the Homeless

NCT01736982
View directory record Official record
Conditions
Cigarette Smoking
Interventions
Contingency Management, Standard of Care
Behavioral · Other
Lead sponsor
UConn Health
Other
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
New Britain, Connecticut
Source: ClinicalTrials.gov public record
Updated Jan 16, 2018 · Synced Oct 22, 2026, 3:37 AM EDT
Terminated Not applicable Interventional Results available

Methacetin Breath Test in Patients With Liver Disease Secondary to Heart Disease

NCT04176458
View directory record Official record
Conditions
Dilated Cardiomyopathy, Tricuspid Atresia
Interventions
Methacetin Breath Test (MBT)
Device
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 5, 2023 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Phase 4 Interventional Results available

A Longitudinal Study to Identify IBS Phenotypes Using Fecal Microbiota and Hydrogen Breath Testing

NCT03219528
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Rifaximin 550 MG, Low FODMAP Diet
Drug · Other
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 27, 2025 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Not applicable Interventional

Lung Function Testing in Patients With Locally Advanced or Metastatic Solid Tumors

NCT00914147
View directory record Official record
Conditions
Unspecified Adult Solid Tumor, Protocol Specific
Interventions
pulmonary function testing
Procedure
Lead sponsor
Barbara Ann Karmanos Cancer Institute
Other
Eligibility
18 Years to 120 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 8, 2021 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Serum-Derived Bovine Immunoglobulin Protein Isolate in Subjects With Decompensated Cirrhosis With Ascites

NCT02608658
View directory record Official record
Conditions
Cirrhosis of the Liver, Ascites, Spontaneous Bacterial Peritonitis
Interventions
Medical food, EnteraGam (Serum-Derived Bovine Immunoglobulin)
Other
Lead sponsor
St. Louis University
Other
Eligibility
18 Years to 70 Years
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 1, 2018 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Phase 1 Interventional

Relationship Between Gastric Emptying and Glycemic Variability in Type 1 Diabetes Mellitus

NCT02755064
View directory record Official record
Conditions
Diabetes Mellitus, Type 1
Interventions
Erythromycin lactobionate, Placebo IV, [13C]-Spirulina, Erythromycin Ethylsuccinate Suspension, Placebo Suspension
Drug
Lead sponsor
Adil Bharucha
Other
Eligibility
Not listed
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 28, 2016 · Synced Oct 22, 2026, 3:37 AM EDT
Terminated Phase 2 Interventional

BreathID Multi-center HCV Liver Breath Test Study

NCT00350714
View directory record Official record
Conditions
Hepatitis C
Interventions
MBT and BreathID
Other
Lead sponsor
Meridian Bioscience, Inc.
Industry
Eligibility
18 Years and older
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
4
States / cities
New York, New York • Houston, Texas • Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Dec 20, 2022 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Smartphone-based Financial Incentives

NCT03922360
View directory record Official record
Conditions
Tobacco Use Disorder
Interventions
Smartphone-based Financial Incentives, Best Practices
Behavioral
Lead sponsor
University of Vermont
Other
Eligibility
18 Years and older · Female only
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated May 14, 2026 · Synced Oct 22, 2026, 3:37 AM EDT
Withdrawn Not applicable Interventional

The Effectiveness of the Jamboxx Respiratory Therapy Device: Study 2

NCT03522480
View directory record Official record
Conditions
Cystic Fibrosis in Children
Interventions
Jamboxx Respiratory Therapy Device, Autogenic Draining Training
Device · Other
Lead sponsor
My Music Machines Inc.
Industry
Eligibility
5 Years to 17 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
Albany, New York
Source: ClinicalTrials.gov public record
Updated Sep 2, 2020 · Synced Oct 22, 2026, 3:37 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Microneurography and Spinal Cord Stimulation in Chronic Visceral Pain

NCT00678717
View directory record Official record
Conditions
Chronic Pain
Interventions
Autonomic Evaluation
Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Mar 16, 2018 · Synced Oct 22, 2026, 3:37 AM EDT
Terminated Phase 3 Interventional Results available

A Phase 3 Adaptive Study to Evaluate the Safety and Efficacy of Inhaled Treprostinil in Participants With Pulmonary Hypertension (PH) Due to Chronic Obstructive Pulmonary Disease (COPD)

NCT03496623
View directory record Official record
Conditions
Pulmonary Hypertension, Chronic Obstructive Pulmonary Disease
Interventions
Inhaled treprostinil solution, Placebo solution
Drug
Lead sponsor
United Therapeutics
Industry
Eligibility
18 Years and older
Enrollment
188 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
65
States / cities
Birmingham, Alabama • Phoenix, Arizona • Tucson, Arizona + 53 more
Source: ClinicalTrials.gov public record
Updated Nov 24, 2023 · Synced Oct 22, 2026, 3:37 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Cough Reflex Sensitivity and Bronchial Hyper-responsiveness

NCT01777867
View directory record Official record
Conditions
Gastroesophageal Reflux Disease, Chronic Cough, Broncho-hyperreactivity
Interventions
Cough Reflex Sensitivity, Methacholine Challenge
Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 60 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2016
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Feb 17, 2017 · Synced Oct 22, 2026, 3:37 AM EDT
Recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Chronic Lung Allograft Dysfunction MRI Study

NCT06406777
View directory record Official record
Conditions
Chronic Lung Allograft Dysfunction Lung MRI (CLAD)
Interventions
Spirometry, Contrast Lung Computed Tomography (CT) Scan, Oxygen enhanced magnetic resonance imaging (OE-MRI) Scan, 129Xe MRI scans
Diagnostic Test · Drug
Lead sponsor
Sean Fain
Other
Eligibility
18 Years to 80 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2028
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Examine the Effects of Meditation on Daily Psychological Stress Responses in Woman With a History of Child Adversity

NCT04606199
View directory record Official record
Conditions
Stress, Psychological Stress, Child Maltreatment, Depressive Symptoms, Signs and Symptoms, Psychological Distress, Psychological
Interventions
Mindfulness-based intervention, up to 5 minutes 0-3 times/day
Behavioral
Lead sponsor
University of California, San Francisco
Other
Eligibility
30 Years to 60 Years · Female only
Enrollment
53 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated May 4, 2025 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

MagniXene MRI Use in Patients With Asthma and COPD to Assess Regional Lung Function by Delineating Ventilation Defects

NCT01833390
View directory record Official record
Conditions
Asthma, COPD, Healthy
Interventions
HXe MRI lung ventilation
Drug
Lead sponsor
Xemed LLC
Industry
Eligibility
21 Years to 75 Years
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2015
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 11, 2015 · Synced Oct 22, 2026, 3:37 AM EDT
Terminated No phase listed Interventional Results available

Companion Protocol for Methacetin Breath Test (MBT) in Conatus Protocol IDN-6556-17

NCT03462576
View directory record Official record
Conditions
Decompensated Cirrhosis
Interventions
Methacetin Breath Test, Emricasan, Placebo oral capsule
Combination Product · Drug
Lead sponsor
Meridian Bioscience, Inc.
Industry
Eligibility
18 Years and older
Enrollment
199 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Lakewood Rch, Florida
Source: ClinicalTrials.gov public record
Updated Dec 20, 2022 · Synced Oct 22, 2026, 3:37 AM EDT
Completed Phase 3 Interventional Results available

Urea Breath Test (UBT) With Breath Hp System /BreathID Hp Lab System Pediatrics

NCT02905825
View directory record Official record
Conditions
Helicobacter Pylori Infection
Interventions
BreathID® Hp System, BreathID® Hp Lab System, Stool Test
Device · Drug · Diagnostic Test
Lead sponsor
Meridian Bioscience, Inc.
Industry
Eligibility
3 Years to 18 Years
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017
U.S. locations
5
States / cities
Shreveport, Louisiana • Flowood, Mississippi • Nashville, Tennessee + 2 more
Source: ClinicalTrials.gov public record
Updated Dec 20, 2022 · Synced Oct 22, 2026, 3:37 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Pulse Oximeter Accuracy During Stable Hypoxia Plateaus

NCT07408388
View directory record Official record
Conditions
Hypoxia
Interventions
Pulse Oximeter, Induced hypoxia through breathing nitrogen-air-carbon dioxide mixture
Device · Procedure
Lead sponsor
Nihon Kohden
Industry
Eligibility
18 Years to 50 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Feb 17, 2026 · Synced Oct 22, 2026, 3:37 AM EDT
Completed No phase listed Observational

Delineating Swallowing Impairment and Decline in ALS

NCT02962050
View directory record Official record
Conditions
Amyotrophic Lateral Sclerosis
Interventions
Videofluoroscopic Swallowing Study (VFSS), Voluntary Peak Cough Flow Testing, Iowa Oral Performance Instrument, Capsaicin Challenge, Pulmonary Function Testing, Eating Assessment Tool 10, The Center for Neurologic Study Bulbar Function Scale
Procedure · Device · Drug + 1 more
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 90 Years
Enrollment
109 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2023
U.S. locations
2
States / cities
Gainesville, Florida • Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Feb 23, 2023 · Synced Oct 22, 2026, 3:37 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Biomarkers in the Evaluation of Chronic Lung Disease

NCT00926523
View directory record Official record
Conditions
Pulmonary Hypertension, Pulmonary Arterial Hypertension, Interstitial Lung Disease
Interventions
Blood Gas, Pulmonary Exercise Test, Spirometry, Breath Condensate Collector
Other
Lead sponsor
Northwell Health
Other
Eligibility
18 Years and older
Enrollment
67 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
New Hyde Park, New York
Source: ClinicalTrials.gov public record
Updated May 27, 2011 · Synced Oct 22, 2026, 3:37 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Breath Analysis & Malnutrition

NCT06115148
View directory record Official record
Conditions
Malnutrition
Interventions
Feeding, Fasting
Other
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
18 Years to 95 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Source: ClinicalTrials.gov public record
Updated Jan 21, 2026 · Synced Oct 22, 2026, 3:37 AM EDT