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ClinicalTrials.gov public records Last synced Oct 17, 2026, 1:11 PM EDT

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Showing 1–24 of 332 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Breath test Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Ultra-Processed Foods, Palatability, Appetite, and Gastrointestinal Transit

NCT07600281
View directory record Official record
Conditions
Appetite, Gastrointestinal Transit, Food Processing, Food Palatability, Eating Behavior
Interventions
Palatable Ultra-Processed Food Meal, Unpalatable Ultra-Processed Food Meal, Palatable Non-Ultra-Processed Food Meal, Unpalatable Non-Ultra-Processed Food Meal
Other
Lead sponsor
Purdue University
Other
Eligibility
18 Years to 60 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 22, 2026 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Selah Trial of Stress Interventions for Clergy: Mindfulness Based Stress Reduction, Daily Examen, and Stress Inoculation

NCT04625777
View directory record Official record
Conditions
Occupational Stress
Interventions
Mindfulness Based Stress Reduction, Daily Examen spiritual practice, Stress inoculation combination
Behavioral
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
390 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 22, 2022 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Phase 4 Interventional Results available

Ketone Monitoring in T1D: Effect of SGLT2i During Usual Care and With Insulin Deficiency

NCT05541484
View directory record Official record
Conditions
Diabetes Mellitus, Type 1
Interventions
SGLT2 inhibitor, Biosense Breath Ketone Analyzer
Drug · Device
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 75 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Feb 21, 2025 · Synced Oct 17, 2026, 1:11 PM 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 8, 2023 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Phase 4 Interventional

Hyperpolarized Imaging for New Treatments

NCT04259970
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Initiation of CFTR Modulator
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
6 Years to 18 Years
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
3
States / cities
Cincinnati, Ohio • Charlottesville, Virginia • Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 7, 2026 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Not applicable Interventional

Breath Training Exercise for the Reduction of Chronic Dyspnea

NCT01831388
View directory record Official record
Conditions
Chronic Pulmonary Disorder
Interventions
breathing techniques, Self-Administered Baseline and Transition Dyspnea Indexes
Other · Behavioral
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
19 Years and older
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 17, 2018 · Synced Oct 17, 2026, 1:11 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Cardiovascular and Neurovascular Regulation in GWI

NCT04586049
View directory record Official record
Conditions
Brain Blood Flow, Neurovascular Control
Interventions
MRI, Transcranial Doppler Ultrasound, Sympathetic Nerve Activity
Device · Other
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
45 Years to 68 Years
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jun 8, 2026 · Synced Oct 17, 2026, 1:11 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Exhaled Breath Condensate Biomarkers of Inflammation in Individuals With Chronic Cervical Spinal Cord Injury

NCT02235714
View directory record Official record
Conditions
Tetraplegia, Asthma
Interventions
Not listed
Lead sponsor
James J. Peters Veterans Affairs Medical Center
Federal
Eligibility
18 Years to 89 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Sep 10, 2014 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Not applicable Interventional

Web-Delivered Interventions for Blood Sugar Control for Individuals With Type 2 Diabetes

NCT02676648
View directory record Official record
Conditions
Diabetes Mellitus, Type 2
Interventions
Multicomponent online program, Breath meter, Text messages, Diet-appropriate foods and cookbooks
Behavioral
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Aug 9, 2021 · Synced Oct 17, 2026, 1:11 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Single-Breath Measurement Underestimates Ventilatory Volume According to Emphysema Severity

NCT00528944
View directory record Official record
Conditions
Emphysema
Interventions
Not listed
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 81 Years
Enrollment
73 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 7, 2015 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Studies to Determine Whether Oxygen Sensing is Impaired in Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infected Patients

NCT04954157
View directory record Official record
Conditions
Hypoxia, SARS-CoV-2 Acute Respiratory Disease, Carotid Bodies
Interventions
Phase-1: Breath Holding Test, Phase 2: 6-Minute Walk Test (6MWT)
Diagnostic Test
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 16, 2022 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Phase 3 Interventional Results available

Rifaximin and Placebo in the Treatment of Bowel Dysfunction After Anterior Resection for Rectal Cancer

NCT01345175
View directory record Official record
Conditions
Rectal Cancer
Interventions
Rifaximin, Placebo
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
21 Years and older
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2023
U.S. locations
3
States / cities
Basking Ridge, New Jersey • Commack, New York • New York, New York
Source: ClinicalTrials.gov public record
Updated May 14, 2024 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Not applicable Interventional

Pilot Study of Physiological Effect of High-Flow Nasal Cannula on Respiratory Pattern and Work of Breathing

NCT02514798
View directory record Official record
Conditions
COPD
Interventions
Esophageal and gastric balloons, Respiratory Inductance Plethysmography (RIP) system, Sentec transcutaneous monitoring system, High-flow humidified nasal oxygen delivery system, CPAP (Positive Control)
Other · Device
Lead sponsor
Tufts Medical Center
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 10, 2022 · Synced Oct 17, 2026, 1:11 PM 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 20, 2026 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Breathing on Cognitive Performance and Stress

NCT06986135
View directory record Official record
Conditions
Stress, Acute Stress Reaction, Breathing Techniques, Cognitive Performance
Interventions
Box Breathing, Prolonged Exhalation, Normal Breathing
Other
Lead sponsor
Texas State University
Other
Eligibility
18 Years to 39 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
San Marcos, Texas
Source: ClinicalTrials.gov public record
Updated May 22, 2025 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

ABCA2 GIRMS Analytical Validation Clinical Performance Study

NCT04607304
View directory record Official record
Conditions
Gastroparesis
Interventions
ABCA2 GIRMS
Device
Lead sponsor
Cairn Diagnostics
Industry
Eligibility
18 Years to 85 Years
Enrollment
95 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Brentwood, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 30, 2021 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

13C-Pyruvate Breath Test

NCT01807702
View directory record Official record
Conditions
Healthy
Interventions
13C-Pyruvate 13C-lactate and dichloroacetate
Drug
Lead sponsor
University of Florida
Other
Eligibility
21 Years to 50 Years
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Dec 2, 2015 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Not applicable Interventional

Automated Inhaler Monitoring for Asthma Medication Usage

NCT06825871
View directory record Official record
Conditions
Asthma
Interventions
Smart Inhaler Monitoring Platform for Asthma Management
Device
Lead sponsor
Boston Children's Hospital
Other
Eligibility
10 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 29, 2026 · Synced Oct 17, 2026, 1:11 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Defining a PD-specific Breath Fingerprint of Underlying Inflammatory and Neurodegenerative Processes

NCT02749214
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Blood Sample Collection, Breath Sample Collection
Other
Lead sponsor
Emory University
Other
Eligibility
25 Years to 85 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 18, 2019 · Synced Oct 17, 2026, 1:11 PM EDT
Recruiting Not applicable Interventional

A Study of Breath Testing for Small Intestinal Bacterial Overgrowth

NCT05976165
View directory record Official record
Conditions
Gastroesophageal Reflux, Regurgitation, Heartburn
Interventions
Breath Testing
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Oct 17, 2026, 1:11 PM 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 17, 2026, 1:11 PM EDT
Recruiting Not applicable Interventional

A Pilot Study Examining Low Sulfur Diet as Treatment for Persistent Symptoms in Quiescent Crohn's Disease

NCT05849012
View directory record Official record
Conditions
Crohn's Disease in Remission
Interventions
Low Sulfur Diet, Usual Diet
Other
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jan 15, 2026 · Synced Oct 17, 2026, 1:11 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Detection of Pseudomonas Aeruginosa in the Airways of Patients With CF

NCT01303068
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
13C urea breath test Kit
Device
Lead sponsor
University of New Mexico
Other
Eligibility
18 Years to 50 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Jan 30, 2024 · Synced Oct 17, 2026, 1:11 PM EDT
Completed No phase listed Observational

Oxygenation Instability and Maturation of Control of Breathing in Premature Infants

NCT03445689
View directory record Official record
Conditions
Infant,Premature
Interventions
Assessment of oxygenation instability, Determination of mechanisms of hypoxemia episodes, Assessment of respiratory instability, apneic threshold of CO2, Assessment of peripheral chemoreceptor function, Assessment of central chemo-receptor function
Other
Lead sponsor
University of Miami
Other
Eligibility
Not listed
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Mar 18, 2025 · Synced Oct 17, 2026, 1:11 PM EDT