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ClinicalTrials.gov public records Last synced Oct 25, 2026, 5:42 PM EDT

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Showing 217–240 of 303 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Breath Testing Clear all
Completed No phase listed Observational Accepts healthy volunteers

Detecting Drugs of Abuse Via Exhaled Breath Samples Using Differential Mobility Spectrometry

NCT05384470
View directory record Official record
Conditions
Opiate Abuse, Marijuana Abuse, Diagnostic
Interventions
Marihuana, BID2 Instrument - breathalyzer
Drug · Device
Lead sponsor
Mclean Hospital
Other
Eligibility
21 Years to 50 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Belmont, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 2, 2025 · Synced Oct 25, 2026, 5:42 PM EDT
Terminated Phase 1Phase 2 Interventional Results available

Project 4A: Inspiratory Muscle Training and Diaphragm Strength

NCT02367170
View directory record Official record
Conditions
Sepsis
Interventions
Bilateral phrenic nerve stimulation and measurement of transdiaphragmatic pressure, Midazolam, Volitional Measurement of Maximal Inspiratory Pressure (MIP), Inspiratory Muscle Strength Training (IMST), SHAM Inspiratory Muscle Strength Training (IMST), Diaphragm thickness measurement, Blood and Urine samples
Procedure · Drug · Device + 1 more
Lead sponsor
University of Florida
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated May 7, 2018 · Synced Oct 25, 2026, 5:42 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Essential Oil Inhalation and Acute Stress Response in Healthy Adults

NCT07473544
View directory record Official record
Conditions
Psychological Stress
Interventions
Essential Oil Inhalation, Placebo Aroma Stick
Other
Lead sponsor
dōTERRA International
Industry
Eligibility
18 Years to 45 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Pleasant Grove, Utah
Source: ClinicalTrials.gov public record
Updated May 12, 2026 · Synced Oct 25, 2026, 5:42 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 25, 2026, 5:42 PM 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 25, 2026, 5:42 PM EDT
Completed No phase listed Observational

Palmitate Breath Test to Assess Fatty Acid Oxidation in Non Alcoholic Fatty Liver Disease (NAFLD)

NCT02363309
View directory record Official record
Conditions
Fatty Liver
Interventions
Not listed
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
21 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 13, 2021 · Synced Oct 25, 2026, 5:42 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Assessment of Chronic Lung Allograft Dysfunction Using Single-breath & Multi-breath Hyperpolarized Xenon-129 MRI

NCT04941573
View directory record Official record
Conditions
Lung Transplant Rejection
Interventions
Hyperpolarized 129-Xenon (MagniXene) MRI of the lung
Combination Product
Lead sponsor
Xemed LLC
Industry
Eligibility
18 Years to 80 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 30, 2025 · Synced Oct 25, 2026, 5:42 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Cough According to Stimulus Type in PD

NCT02390089
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Capsaicin vapor, fog, Videofluoroscopic swallow evaluation, Nebulizer
Drug · Other · Radiation + 1 more
Lead sponsor
University of Florida
Other
Eligibility
50 Years to 80 Years
Enrollment
158 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Feb 15, 2019 · Synced Oct 25, 2026, 5:42 PM EDT
Terminated Phase 2 Interventional Results available

Rifaximin on Visceral Hypersensitivity

NCT03462966
View directory record Official record
Conditions
Visceral Hypersensitivity, Irritable Bowel Syndrome
Interventions
Rifaximin
Drug
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years to 75 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Sep 13, 2022 · Synced Oct 25, 2026, 5:42 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 25, 2026, 5:42 PM EDT
Completed Not applicable Interventional

Clinical Trial to Evaluate the Safety and Effectiveness of the IBV® Valve System for the Treatment of Severe Emphysema

NCT00475007
View directory record Official record
Conditions
Emphysema, COPD
Interventions
IBV® Valve System
Device
Lead sponsor
Olympus Corporation of the Americas
Industry
Eligibility
40 Years to 74 Years
Enrollment
277 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2017
U.S. locations
34
States / cities
Birmingham, Alabama • Los Angeles, California • Mission Viejo, California + 29 more
Source: ClinicalTrials.gov public record
Updated Apr 17, 2018 · Synced Oct 25, 2026, 5:42 PM 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 10, 2013 · Synced Oct 25, 2026, 5:42 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers

Cerebrovascular Reactivity Assessed With fNIRS as a Biomarker of TCVI After Acute Traumatic Brain Injury in Military

NCT04058132
View directory record Official record
Conditions
Traumatic Brain Injury
Interventions
Sildenafil Citrate 50Mg Tab, functional Near-infrared Spectroscopy (fNIRS), Carbon Dioxide (CO2) 5%, Neuropsychological Assessments, Gadolinium contrast infusion, Blood sample collection for research purposes, Structural brain Magnetic Resonance Imaging (MRI
Drug · Device · Other + 1 more
Lead sponsor
Uniformed Services University of the Health Sciences
Federal
Eligibility
18 Years to 55 Years
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 28, 2024 · Synced Oct 25, 2026, 5:42 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 25, 2026, 5:42 PM EDT
Completed No phase listed Observational

Energy Expenditure and Gastric Bypass Surgery Study

NCT00671957
View directory record Official record
Conditions
Morbid Obesity
Interventions
Not listed
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years to 80 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2019
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jun 21, 2019 · Synced Oct 25, 2026, 5:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Cardiac Autonomic Function in Women with Microvascular Coronary Dysfunction

NCT01568177
View directory record Official record
Conditions
Microvascular Coronary Dysfunction
Interventions
Mental Stress Testing, Peripheral Arterial Tonometry (PAT) Testing, Heart Rate Variability (HRV), RESPeRATE Breathing Trial, SPECT cardiac scan with 123I-mIBG and Myoview
Behavioral · Other · Procedure
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Sep 19, 2024 · Synced Oct 25, 2026, 5:42 PM EDT
Terminated Phase 2 Interventional Results available

Effects of Inhaled Treprostinil Sodium for the Treatment of Pulmonary Hypertension Associated With Idiopathic Pulmonary Fibrosis

NCT00703339
View directory record Official record
Conditions
Idiopathic Pulmonary Fibrosis, Pulmonary Hypertension
Interventions
Treprostinil sodium for inhalation
Drug
Lead sponsor
Lung Biotechnology PBC
Industry
Eligibility
35 Years to 80 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
6
States / cities
La Jolla, California • Sacramento, California • Ann Arbor, Michigan + 3 more
Source: ClinicalTrials.gov public record
Updated May 11, 2018 · Synced Oct 25, 2026, 5:42 PM EDT
Completed No phase listed Observational

Esophageal Motility in Reflux Induced Cough

NCT02492126
View directory record Official record
Conditions
Cough
Interventions
Citric Acid
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 75 Years
Enrollment
87 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Oct 30, 2020 · Synced Oct 25, 2026, 5:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Inspiratory Muscle Training in Postmenopausal Women

NCT06459674
View directory record Official record
Conditions
Postmenopausal Symptoms, Aging, Obesity
Interventions
PrO2 Fit (IMT Trainer)
Device
Lead sponsor
Indiana University
Other
Eligibility
50 Years to 75 Years · Female only
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Bloomington, Indiana
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Oct 25, 2026, 5:42 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

PET Image in PAH Patients

NCT05452889
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
18F-FGLN PET Imaging, (18F)FPGLU
Diagnostic Test · Drug
Lead sponsor
Stephen Y. Chan
Other
Eligibility
18 Years to 75 Years
Enrollment
71 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2027
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 21, 2026 · Synced Oct 25, 2026, 5:42 PM 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 25, 2026, 5:42 PM EDT
Completed No phase listed Observational

Prematurity and Respiratory Outcomes Program (PROP)

NCT01435187
View directory record Official record
Conditions
Prematurity, Respiratory Disease
Interventions
Not listed
Lead sponsor
University of Pennsylvania
Other
Eligibility
1 Day to 7 Days
Enrollment
835 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
13
States / cities
Oakland, California • San Francisco, California • Indianapolis, Indiana + 8 more
Source: ClinicalTrials.gov public record
Updated Nov 7, 2016 · Synced Oct 25, 2026, 5:42 PM EDT
Completed No phase listed Observational Results available

A Study to Explore the Utility of Fractional Exhaled Nitric Oxide (FeNO) Compared With Methacholine Challenge (MCC) Testing in the Assessment of Patients With Suspected But Undiagnosed Asthma

NCT01648920
View directory record Official record
Conditions
Asthma
Interventions
NIOX MINO® Instrument (09-1100)
Device
Lead sponsor
Aerocrine AB
Industry
Eligibility
7 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012
U.S. locations
8
States / cities
Blue Bell, Pennsylvania • Collegeville, Pennsylvania • Doylestown, Pennsylvania + 5 more
Source: ClinicalTrials.gov public record
Updated Apr 9, 2014 · Synced Oct 25, 2026, 5:42 PM EDT
Suspended Not applicable Interventional Accepts healthy volunteers

Craniofacial Dimensions as Determinants of the Fitted Performance of Common Face Masks (FACEFIT 2.0)

NCT06425588
View directory record Official record
Conditions
Healthy
Interventions
Surgical/Procedure Mask Fit Testing, KN95 Mask Fit testing
Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 12, 2025 · Synced Oct 25, 2026, 5:42 PM EDT