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ClinicalTrials.gov public records Last synced Oct 25, 2026, 8:53 PM EDT

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Showing 265–288 of 303 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Breath Testing Clear all
Completed Not applicable Interventional

Self-Managed Intervention for Anxiety in Parkinson's Disease

NCT03859180
View directory record Official record
Conditions
Parkinson Disease, Anxiety
Interventions
Focused breathing
Behavioral
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 29, 2020 · Synced Oct 25, 2026, 8:53 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Characterization of a Portable Solid-State Breath Acetone Testing Device for Real-Time Ketosis Status

NCT04130724
View directory record Official record
Conditions
Ketogenic Dieting, Ketosis
Interventions
Blood ketone testing, Breath ketone testing
Diagnostic Test
Lead sponsor
Readout, Inc.
Industry
Eligibility
18 Years and older
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 17, 2019 · Synced Oct 25, 2026, 8:53 PM EDT
Completed Phase 1 Interventional

Imaging Study Compare 4DCT Image

NCT01626001
View directory record Official record
Conditions
Esophagus Cancer, Lung Cancer
Interventions
4D CT scans
Procedure
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Nov 18, 2015 · Synced Oct 25, 2026, 8:53 PM EDT
Completed No phase listed Observational

COVID Breath Test - Ancon

NCT04760639
View directory record Official record
Conditions
Covid19
Interventions
Breath test
Diagnostic Test
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Nov 14, 2022 · Synced Oct 25, 2026, 8:53 PM EDT
Completed Phase 1 Interventional

T Cell Effector and Regulatory Mechanisms in Asthma

NCT01612936
View directory record Official record
Conditions
Asthma, Allergies
Interventions
Bronchoscopy, Segmental Allergen Challenge and Broncheoalveolar Lavage, PET-CT imaging(13NN perfusion/ventilation, 18FDG inflammation, and CT imaging)
Biological · Procedure
Lead sponsor
Andrew D. Luster, M.D.,Ph.D.
Other
Eligibility
18 Years to 50 Years
Enrollment
168 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 15, 2017 · Synced Oct 25, 2026, 8:53 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Adult Pilot Study for Reference Ranges and Optimal Cut-offs for the Sucrose Challenge Test and Sucrose Breath Test

NCT05045495
View directory record Official record
Conditions
Congenital Sucrase-Isomaltase Deficiency
Interventions
Sucrose Hydrogen Methane Breath Test
Diagnostic Test
Lead sponsor
QOL Medical, LLC
Industry
Eligibility
18 Years and older
Enrollment
211 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Culver City, California
Source: ClinicalTrials.gov public record
Updated May 24, 2022 · Synced Oct 25, 2026, 8:53 PM EDT
Completed Early Phase 1 Interventional

Deconditioning in Transplant

NCT02611219
View directory record Official record
Conditions
Hematopoietic and Stem Cell Transplant
Interventions
General Health Module-Baseline Adolescent-Self Report (13-18 years), General Health Module-Follow Up Adolescent-Self Report (13-18 years), General Health Module-Baseline Parent Report-Adolescent (13-18 years), General Health Module-Follow Up Parent Report-Adolescent (13-18 years), General Health Module-Baseline Parent Report-School Age (5-12 years), General Health Module-Follow Up Parent Report-School Age (5-12 years), Demographic Data Form, SCT Daily Activity Log, The Functional Independence Measure for Children, Manual Muscle Testing, 3-Minute Step Test, HSCT Module-Follow Up Adolescent-Self Report (13-18 years), HSCT Module-Follow Child-Self Report (5-12 years), HSCT Module-Follow Up Parent Report-adolescent (13-18 years), HSCT Module-Follow Up Parent Report-School Age (5-12 years)
Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
7 Years to 17 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated May 27, 2016 · Synced Oct 25, 2026, 8:53 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Breath Analysis Based Disease Biomarkers

NCT04341012
View directory record Official record
Conditions
Liver Diseases, Liver Cancer, COVID19
Interventions
Collection of breath sample
Diagnostic Test
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 26, 2026 · Synced Oct 25, 2026, 8:53 PM EDT
Not listed Phase 2 Interventional

The Role of Bacterial Overgrowth and Delayed Intestinal Transit in Hepatic Encephalopathy

NCT00281502
View directory record Official record
Conditions
Hepatic Encephalopathy, Hepatitis C, Liver Cirrhosis
Interventions
Rifaximin (drug)
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years to 75 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 5, 2010 · Synced Oct 25, 2026, 8:53 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Mindfulness-Based Intervention With a Supplement for Stress-Related Problems in College Students Across Multiple Sites (4SITE)

NCT07098845
View directory record Official record
Conditions
Stress, Mental Health, Mindfulness Based Stress Reduction
Interventions
Learning to BREATHE, Learning to BREATHE Plus, HealthEd
Behavioral
Lead sponsor
Colorado State University
Other
Eligibility
18 Years to 25 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
4
States / cities
Denver, Colorado • Fort Collins, Colorado • Saint Paul, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Oct 25, 2026, 8:53 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Neurobehavioral Changes Following Spaceflight Stressors

NCT07293494
View directory record Official record
Conditions
Stressor, Individual, Alcohol Impairment, Sleep Deprivation, Impairment, Cognitive
Interventions
Alcohol Administration, Sleep Deprivation, Control
Other · Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
21 Years to 60 Years
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2029
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Oct 25, 2026, 8:53 PM 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 25, 2026, 8:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Manipulation of Breath Alcohol Tests: Can Specific Techniques Alter Blood Alcohol Concentration Readings?

NCT02580318
View directory record Official record
Conditions
Alcohol Concentration Values, Alcohol Intoxication
Interventions
breathalyzer
Device
Lead sponsor
St. Luke's Hospital and Health Network, Pennsylvania
Other
Eligibility
21 Years and older
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Bethlehem, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 15, 2017 · Synced Oct 25, 2026, 8:53 PM EDT
Completed Phase 2 Interventional

UMCC 9901: Phase II Study of Tailored-Dose Docetaxel + Trastuzumab in Her-2 Positive Metastatic Breast Cancer

NCT00146042
View directory record Official record
Conditions
HER-2 Positive Metastatic Breast Cancer
Interventions
Docetaxel, Trastuzumab, Erythromycin Breath Test (ERMBT)
Drug · Procedure
Lead sponsor
University of Michigan Rogel Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2005
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 5, 2012 · Synced Oct 25, 2026, 8:53 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Effects of Bevespi on Ventilation and Gas Exchange Abnormalities in COPD Assessed by 129Xe MRI

NCT03324607
View directory record Official record
Conditions
COPD
Interventions
hyperpolarized 129Xe gas MRI, Bevespi Aerosphere
Drug
Lead sponsor
Bastiaan Driehuys
Other
Eligibility
40 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 19, 2021 · Synced Oct 25, 2026, 8:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Leveraging Exercise Stress Echocardiography for Heart Failure With Preserved Ejection Fraction

NCT06927973
View directory record Official record
Conditions
Chest Pain, Shortness of Breath
Interventions
Echocardiogram
Diagnostic Test
Lead sponsor
Duke University
Other
Eligibility
50 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Dec 23, 2025 · Synced Oct 25, 2026, 8:53 PM 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 23, 2026 · Synced Oct 25, 2026, 8:53 PM EDT
Recruiting Not applicable Interventional

Non-Invasive Interventions for Respiratory Recovery in Chronic Spinal Cord Injury

NCT07135583
View directory record Official record
Conditions
Spinal Cord Injury, Chronic, Spinal Cord Injury Cervical, Spinal Cord Injury Thoracic, Incomplete Spinal Cord Injury
Interventions
Active Comparator: Single Intervention 1, Active Comparator: Single Intervention 2, Respiratory Resistance Exercise
Other · Behavioral
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years to 70 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 5, 2026 · Synced Oct 25, 2026, 8:53 PM EDT
Withdrawn Not applicable Interventional

Contingency Management for Smoking Cessation in Pregnant Minority Women

NCT02195570
View directory record Official record
Conditions
Cigarette Smoking
Interventions
Quit Smoking Now (QSN), Prize-based Contingency Management (CM)
Other · Behavioral
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated May 9, 2019 · Synced Oct 25, 2026, 8:53 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Remote Incentives for Smoking Cessation Among AN Pregnant Women

NCT05019170
View directory record Official record
Conditions
Smoking, Smoking Cessation
Interventions
Smartphone-based Financial Incentives, Best Practices
Behavioral
Lead sponsor
University of Vermont
Other
Eligibility
18 Years and older · Female only
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
2
States / cities
Anchorage, Alaska • Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Dec 1, 2023 · Synced Oct 25, 2026, 8:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Carbon-13 (13C)-Spirulina Platensis Gastric Emptying Breath Test (GEBT)

NCT01248221
View directory record Official record
Conditions
Dyspepsia
Interventions
[13C]-Spirulina platensis and 99mTc sulfur colloid
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 70 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 18, 2013 · Synced Oct 25, 2026, 8:53 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Safety and Efficacy of Inhaled Treprostinil in Adult PH With ILD Including CPFE

NCT02630316
View directory record Official record
Conditions
Pulmonary Hypertension, Interstitial Lung Disease, Combined Pulmonary Fibrosis and Emphysema
Interventions
Inhaled Treprostinil, Placebo
Drug
Lead sponsor
United Therapeutics
Industry
Eligibility
18 Years and older
Enrollment
326 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
96
States / cities
Birmingham, Alabama • Mobile, Alabama • Phoenix, Arizona + 71 more
Source: ClinicalTrials.gov public record
Updated Jul 27, 2022 · Synced Oct 25, 2026, 8:53 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Does Small Intestinal Bacterial Overgrowth Contribute to Functional Dyspepsia

NCT00956397
View directory record Official record
Conditions
Functional Dyspepsia, Small Intestinal Bacterial Overgrowth, Chronic Abdominal Discomfort
Interventions
Rifaximin, Lactulose Breath Test, Placebo
Drug · Procedure
Lead sponsor
Henry C. Lin, MD
Federal
Eligibility
21 Years and older
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2007
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Oct 24, 2012 · Synced Oct 25, 2026, 8:53 PM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

Assessing Deformable Image Registration in the Lung Using Hyperpolarized-gas MRI

NCT02995590
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Hyperpolarized He3
Drug
Lead sponsor
University of Virginia
Other
Eligibility
18 Years to 64 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Nov 4, 2020 · Synced Oct 25, 2026, 8:53 PM EDT