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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Breath test Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Mechanisms of Altered Ventilatory Control in Heart Failure

NCT02421341
View directory record Official record
Conditions
Heart Failure
Interventions
Fentanyl, Catheters, Exercise, DEXA, Pulmonary Function Tests, Blood Draw, Chemosensitivity Test, Placebo
Drug · Procedure · Other + 1 more
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 90 Years
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2019
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 15, 2021 · Synced Sep 17, 2026, 9:04 AM EDT
Completed Phase 3 Interventional Results available

BreathID 13C-Methacetin Breath Test for Detecting Cirrhosis

NCT00736840
View directory record Official record
Conditions
Chronic Liver Disease
Interventions
c13 methacetin solution with breath analyzer
Device
Lead sponsor
Meridian Bioscience, Inc.
Industry
Eligibility
18 Years and older
Enrollment
414 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
8
States / cities
Los Angeles, California • Detroit, Michigan • Cleveland, Ohio + 5 more
Source: ClinicalTrials.gov public record
Updated Jan 11, 2023 · Synced Sep 17, 2026, 9:04 AM EDT
Terminated Phase 2 Interventional Results available

Acute Effects of Inhaled Treprostinil in Fontan Patients

NCT02769624
View directory record Official record
Conditions
Congenital Heart Disease
Interventions
Treprostinil, Placebo
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 28, 2020 · Synced Sep 17, 2026, 9:04 AM EDT
Recruiting Not applicable Interventional

Carbon Dioxide (CO2) Chemosensitivity and SUDEP

NCT04134754
View directory record Official record
Conditions
Epilepsy, SUDEP
Interventions
6% Carbon dioxide/50% oxygen/balance nitrogen mixture
Other
Lead sponsor
University of Iowa
Other
Eligibility
18 Years to 99 Years
Enrollment
335 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2029
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Sep 17, 2026, 9:04 AM EDT
Completed Phase 2 Interventional

PMRR-NO: Pulmonary Metabolic Radiation Response Versus Exhaled Nitric Oxide

NCT00867477
View directory record Official record
Conditions
Gastrointestinal Disease, Esophageal Cancer, Lung Cancer
Interventions
Breathing Test, Respiratory Symptoms Questionnaire, Pet Scan
Procedure · Behavioral
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
Not listed
Enrollment
163 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 27, 2014 · Synced Sep 17, 2026, 9:04 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Implications and Stability of Clinical and Molecular Phenotypes of Severe Asthma

NCT01748175
View directory record Official record
Conditions
Asthma, Severe Persistent Asthma
Interventions
Triamcinolone Acetonide
Drug
Lead sponsor
Sally E. Wenzel MD
Other
Eligibility
6 Years and older
Enrollment
715 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2022
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 15, 2022 · Synced Sep 17, 2026, 9:04 AM EDT
Recruiting Phase 1Phase 2 Interventional

Mitigating PTSD-CUD After Sexual Assault

NCT05989841
View directory record Official record
Conditions
Posttraumatic Stress Disorder, Cannabis Use Disorder
Interventions
RISE Guide, Relaxation Control
Behavioral
Lead sponsor
University of Nevada, Las Vegas
Other
Eligibility
18 Years and older · Female only
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
6
States / cities
Minneapolis, Minnesota • Las Vegas, Nevada • Chapel Hill, North Carolina + 3 more
Source: ClinicalTrials.gov public record
Updated Jan 15, 2026 · Synced Sep 17, 2026, 9:04 AM EDT
Completed No phase listed Observational

COVID-19 Respiratory Outcomes Registry

NCT05074875
View directory record Official record
Conditions
Covid19
Interventions
Questionnaires and Patient Reported Outcomes (PROs), Nasal Swab COVID-19 reverse transcription polymerase chain reaction test (RT-PCR), Blood Samples for Biomarkers, High Resolution Computed Tomography, Physical Exam and Vital Signs, Medical Research Council Sum Score, Hand Grip Strength, Spirometry, Diffusing Capacity of Carbon Monoxide, 6 Minute Walk Test, Sit to Stand (STS) Measurement
Other · Diagnostic Test · Genetic
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years and older
Enrollment
37 participants
Timeline
2021 – 2023
U.S. locations
4
States / cities
St Louis, Missouri • New York, New York • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 26, 2023 · Synced Sep 17, 2026, 9:04 AM EDT
Completed Phase 2 Interventional Results available

Fentanyl Pectin Nasal Spray (FNPS) for Exercise-Induced Breakthrough Dyspnea

NCT01832402
View directory record Official record
Conditions
Advanced Cancers
Interventions
Fentanyl Pectin Nasal Spray, Placebo Nasal Spray, Walk Test, Questionnaires, Mental Ability Tests
Drug · Other · Behavioral
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2019
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 7, 2023 · Synced Sep 17, 2026, 9:04 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Nicotine Withdrawal and Reward Processing: Connecting Neurobiology to Real-world Behavior

NCT03840694
View directory record Official record
Conditions
Cigarette Smoking, Nicotine Withdrawal
Interventions
Smoking Abstinence, Ad Lib Smoking
Other
Lead sponsor
Duke University
Other
Eligibility
21 Years to 55 Years
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated May 19, 2021 · Synced Sep 17, 2026, 9:04 AM EDT
Recruiting No phase listed Observational

The APS Phenotyping Study

NCT06521502
View directory record Official record
Conditions
ARDS, Sepsis, Pneumonia
Interventions
Blood collection, Urine Collection, Nasal, oral, and rectal swabs, Stool collection, Heat Moisture Exchange Filter collection, Tracheal Aspirate sample collection, Non-bronchoscopic bronchoalveolar lavage (NBBAL), Surveys, Short physical performance battery, Hand grip strength, CNS Vital Signs, Muscle Ultrasound, Muscle Strength, Spirometry, Lung Diffusion Testing (DLCO), Chest CT Scan
Other · Procedure · Radiation
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
4,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
20
States / cities
Fresno, California • Palo Alto, California • San Francisco, California + 12 more
Source: ClinicalTrials.gov public record
Updated Feb 19, 2026 · Synced Sep 17, 2026, 9:04 AM EDT
Terminated Early Phase 1 Interventional

19F MRI of Ventilation in Subjects With Cystic Fibrosis Undergoing Treatment for Pulmonary Exacerbation

NCT03497117
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Lung Clearance Index, MRI with PFP
Device · Drug
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 99 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 8, 2020 · Synced Sep 17, 2026, 9:04 AM EDT
Completed No phase listed Observational

Vascular Aging in Flight Attendants With Occupational Secondhand Smoke Exposure

NCT02795624
View directory record Official record
Conditions
Vascular Aging, Secondhand Smoking
Interventions
Spirometry, Pulse Wave Analysis, Peripheral arterial tonometry
Procedure
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
40 Years and older
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 22, 2021 · Synced Sep 17, 2026, 9:04 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Multi-Component Breath Alcohol Intervention Phase 3

NCT06994962
View directory record Official record
Conditions
Alcohol Use, Alcohol Drinking, Drinking Behavior
Interventions
Alcohol-related mobile health technologies, Motivational interview and psychoeducation on blood/breath alcohol concentration, Lower tech facilitation, Higher tech facilitation, Alcohol Education, Alcohol Education Technology
Device · Behavioral
Lead sponsor
Northeastern University
Other
Eligibility
18 Years to 25 Years
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 19, 2026 · Synced Sep 17, 2026, 9:04 AM EDT
Completed No phase listed Observational Results available

Airway Limitation Study: Study In Primary Care Centers Of Chronic Bronchitis In Long-Term Cigarette Smokers Of At Least 40 Years Of Age With Symptoms Of Cough And Shortness Of Breath

NCT00442468
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive
Interventions
Non-interventional study.
Other
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
40 Years and older
Enrollment
1,283 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007
U.S. locations
47
States / cities
Highlands Ranch, Colorado • Wheat Ridge, Colorado • Clearwater, Florida + 43 more
Source: ClinicalTrials.gov public record
Updated Jan 9, 2013 · Synced Sep 17, 2026, 9:04 AM EDT
Completed No phase listed Observational

Longitudinal Evaluation of HIV-associated Lung Disease Phenotypes

NCT02238327
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease, HIV, Emphysema
Interventions
blood draw, questionnaires, Lung function testing, Six-Minute walk test, Quantitative CT scans, Nasal secretion and cell collection, Echocardiogram
Procedure · Radiation
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 80 Years
Enrollment
232 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2020
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 7, 2020 · Synced Sep 17, 2026, 9:04 AM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Comparison of Pharyngeal Oxygen Delivery by Different Oxygen Masks

NCT02523586
View directory record Official record
Conditions
Hypoxemia, Trauma, Acute Myocardial Infarction
Interventions
Oxygen administration
Other
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years to 70 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jul 31, 2018 · Synced Sep 17, 2026, 9:04 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Effects of Alcohol and Mood on Attention

NCT04276779
View directory record Official record
Conditions
Suicidal Ideas
Interventions
Alcohol administration, Placebo administration, Positive mood induction, Negative mood induction
Other · Behavioral
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
21 Years to 65 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Mar 10, 2025 · Synced Sep 17, 2026, 9:04 AM EDT
Completed Not applicable Interventional Results available

QuitBet Phase II: A Digital Social Game That Pays You to Stop Smoking

NCT05075213
View directory record Official record
Conditions
Smoking Cessation
Interventions
contingency management (deposit contract), leaderboard and social feed, smoking cessation resource list
Behavioral
Lead sponsor
WayBetter, Inc.
Industry
Eligibility
21 Years and older
Enrollment
245 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Wilmington, Delaware
Source: ClinicalTrials.gov public record
Updated Feb 26, 2026 · Synced Sep 17, 2026, 9:04 AM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Mapping Brain Glutamate in Humans: Sex Differences in Cigarette Smokers

NCT05279053
View directory record Official record
Conditions
Sex, Cigarette Smoking
Interventions
Abstinence and Smoking
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 45 Years
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 19, 2026 · Synced Sep 17, 2026, 9:04 AM EDT
Completed Not applicable Interventional Results available

Cost Effectiveness of Combined Contingency Management and Cognitive Behavioral Therapy for Alcohol Use Disorder

NCT03987581
View directory record Official record
Conditions
Alcohol Drinking, Veterans
Interventions
Cognitive Behavioral Therapy (CBT), Mobile Contingency Management (mCM), Long-term incentive
Behavioral
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
151 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 1, 2026 · Synced Sep 17, 2026, 9:04 AM EDT
Completed Not applicable Interventional

Quit IT: Development of a Web-based, 3D Coping Skills Game to Increase Self-Efficacy for Maintaining Smoking Abstinence Following Hospitalization

NCT01915836
View directory record Official record
Conditions
Tobacco Use Cessation
Interventions
web-based video game (Quit IT), Questionnaires, Evaluation Interview
Other · Behavioral
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
30 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2011
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Dec 10, 2014 · Synced Sep 17, 2026, 9:04 AM EDT
Not listed No phase listed Observational

Comparative Assessment of Radioisotope Glucose and Breath Test

NCT04499742
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth
Interventions
Using Isotope (Tc99m-Sulfur Colloid) to label glucose and administer this directly into duodenum.
Radiation
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 80 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Aug 4, 2020 · Synced Sep 17, 2026, 9:04 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 26, 2011 · Synced Sep 17, 2026, 9:04 AM EDT