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ClinicalTrials.gov public records Last synced Sep 28, 2026, 10:11 AM EDT

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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Diagnostic Breath Analysis 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 19, 2026 · Synced Sep 28, 2026, 10:11 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Risk Assessment Evaluation for Identifying Participants at High Risk for Stomach Cancer

NCT06408220
View directory record Official record
Conditions
Gastric Carcinoma
Interventions
Biopsy, Biospecimen Collection, Breath Test, Esophagogastroduodenoscopy, Questionnaire Administration
Procedure · Other
Lead sponsor
City of Hope Medical Center
Other
Eligibility
40 Years to 80 Years
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2029
U.S. locations
1
States / cities
Duarte, California
Source: ClinicalTrials.gov public record
Updated Mar 12, 2026 · Synced Sep 28, 2026, 10:11 AM EDT
Recruiting Not applicable Interventional

Evaluation of Gender-Affirming Treatments on Pulmonary Function in Transgender and Gender Diverse Patients

NCT05587751
View directory record Official record
Conditions
Hormonal Gender-Affirming Therapy
Interventions
Spirometry, Plethysmography
Diagnostic Test
Lead sponsor
Mayo Clinic
Other
Eligibility
14 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 17, 2026 · Synced Sep 28, 2026, 10:11 AM 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 23, 2022 · Synced Sep 28, 2026, 10:11 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Study of T-Regulatory Cells in Asthma

NCT02574351
View directory record Official record
Conditions
Asthma
Interventions
blood draw, breathing test
Biological
Lead sponsor
Northwell Health
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2015
U.S. locations
1
States / cities
New Hyde Park, New York
Source: ClinicalTrials.gov public record
Updated Jan 28, 2016 · Synced Sep 28, 2026, 10:11 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Breath Analysis Technique to Diagnose Pulmonary Embolism

NCT00368836
View directory record Official record
Conditions
Pulmonary Embolism
Interventions
BreathScreen PE
Device
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
475 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 20, 2022 · Synced Sep 28, 2026, 10:11 AM EDT
Completed Not applicable Interventional Results available

COach2Quit TRIAL: Assessing a Prototype Personal Carbon Monoxide Monitor for Smoking Cessation

NCT03142932
View directory record Official record
Conditions
Smoking, Smoking Cessation
Interventions
Individualized carbon monoxide (iCO) monitor, COach2Quit smartphone application, Cessation counseling
Device · Other · Behavioral
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
102 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 3, 2019 · Synced Sep 28, 2026, 10:11 AM 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 7, 2026 · Synced Sep 28, 2026, 10:11 AM 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 14, 2017 · Synced Sep 28, 2026, 10:11 AM EDT
Terminated Not applicable Interventional Results available

Exhaled Breath Analysis to Predict Risk of Symptomatic Pneumonitis

NCT04040244
View directory record Official record
Conditions
Pneumonitis, Nonsmall Cell Lung Cancer Stage III
Interventions
Exhaled Breath Collection, Blood sample
Other
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 10, 2023 · Synced Sep 28, 2026, 10:11 AM EDT
Completed No phase listed Observational

Novel Lung Imaging in Adults Undergoing Radiation Therapy to Assess for Radiation Pneumonitis

NCT02735746
View directory record Official record
Conditions
Lung Cancer, Breast Cancer, Mediastinum Lesion, Radiation Pneumonitis
Interventions
4D Computed Tomography (CT), Cone Beam CT, Low-dose Cinefluorography, Pulmonary Function Tests
Radiation · Device
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 21, 2025 · Synced Sep 28, 2026, 10:11 AM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers

Helicobacter Pylori Screening and Treatment in the At-risk South Florida Community- AIM 1

NCT07224035
View directory record Official record
Conditions
H Pylori Infection, H Pylori Gastritis, Gastric Cancer
Interventions
PYTEST® 14C-Urea Breath Test, VOQUEZNA® Triple Pak®
Drug
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2027
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Feb 16, 2026 · Synced Sep 28, 2026, 10:11 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Assessment of Airway Obstruction in Infants With Lower Respiratory Infections

NCT00435994
View directory record Official record
Conditions
Bronchiolitis, Respiratory Syncytial Virus Infections
Interventions
Inhaled primatene will be given as a breathing treatment, Nasal Washing
Drug · Other
Lead sponsor
Indiana University
Other
Eligibility
2 Months to 2 Years
Enrollment
59 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2012
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated May 31, 2016 · Synced Sep 28, 2026, 10:11 AM EDT
Completed No phase listed Observational

Non-Invasive Biomarkers For Early Detection Of Lung Cancers

NCT01580332
View directory record Official record
Conditions
Lung Cancer
Interventions
Not listed
Lead sponsor
Douglas W. Johnson MD, FACR
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Jul 22, 2014 · Synced Sep 28, 2026, 10:11 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Breath Test for Early Detection of Lung Cancer

NCT00639067
View directory record Official record
Conditions
Lung Neoplasms
Interventions
Breath Collection Apparatus
Device
Lead sponsor
Menssana Research, Inc.
Industry
Eligibility
18 Years and older
Enrollment
215 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2013
U.S. locations
4
States / cities
Newark, Delaware • Orlando, Florida • New York, New York + 1 more
Source: ClinicalTrials.gov public record
Updated May 15, 2014 · Synced Sep 28, 2026, 10:11 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Lung Macrophage Populations and Functions in Chronic Obstructive Pulmonary Disease (COPD)-Susceptible Smokers

NCT04722835
View directory record Official record
Conditions
Copd, Smoking, Tobacco Use
Interventions
Bronchoscopy with Bronchoalveolar Lavage (BAL)
Procedure
Lead sponsor
University of California, San Francisco
Other
Eligibility
40 Years to 75 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2030
U.S. locations
3
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jun 3, 2026 · Synced Sep 28, 2026, 10:11 AM EDT
Terminated No phase listed Observational Accepts healthy volunteers

NanoSpectrometer Biomarker Discovery and Confirmation Study

NCT03275688
View directory record Official record
Conditions
Lung Cancer
Interventions
Breath Analysis
Diagnostic Test
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
332 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 21, 2020 · Synced Sep 28, 2026, 10:11 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 28, 2026, 10:11 AM 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 6, 2018 · Synced Sep 28, 2026, 10:11 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Molecular Markers in Predicting Lung Cancer Development Using Tissue Samples From Healthy Participants

NCT00899457
View directory record Official record
Conditions
Healthy, no Evidence of Disease, Lung Cancer
Interventions
proteomic profiling, biologic sample preservation procedure, laboratory biomarker analysis, bronchoscopy
Genetic · Other · Procedure
Lead sponsor
Vanderbilt-Ingram Cancer Center
Other
Eligibility
18 Years and older
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
3
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jun 23, 2014 · Synced Sep 28, 2026, 10:11 AM EDT
Completed No phase listed Observational

Measuring Exhaled Nitric Oxide (eNO) Using the Apieron INSIGHT System and the Aerocrine NIOX System

NCT00739531
View directory record Official record
Conditions
Asthma
Interventions
Exhaled nitric oxide (eNO)
Device
Lead sponsor
Apieron
Industry
Eligibility
5 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007
U.S. locations
2
States / cities
Shreveport, Louisiana • Lake Oswego, Oregon
Source: ClinicalTrials.gov public record
Updated Aug 20, 2008 · Synced Sep 28, 2026, 10:11 AM EDT
Active, not recruiting No phase listed Observational

Validation of a Molecular Test for Risk-stratification of Patients With High-risk Intestinal Metaplasia (GCEP2 Study)

NCT05782465
View directory record Official record
Conditions
Stomach Neoplasm
Interventions
Blood Collection, processing and analyses, Gastroscopy and biopsies collection, Urea Breath Test
Procedure · Diagnostic Test
Lead sponsor
National University Hospital, Singapore
Other
Eligibility
50 Years to 75 Years
Enrollment
500 participants
Timeline
2019 – 2033
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Sep 28, 2026, 10:11 AM EDT
Recruiting Not applicable Interventional

Monitoring Exhaled Breath to Noninvasively Detect Glycemic Events

NCT06893341
View directory record Official record
Conditions
Diabetes, Hyperglycemia, Hypoglycemia
Interventions
The Sensing Device
Device
Lead sponsor
Indiana University
Other
Eligibility
12 Years to 19 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated May 12, 2026 · Synced Sep 28, 2026, 10:11 AM EDT
Completed No phase listed Observational

Retrospective Analysis of Treatment Outcomes in Patients With Bacterial Overgrowth Syndrome Diagnosed by D-Xylose Breath Testing

NCT01324895
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth Syndrome (SIBO), Small Bowel Bacterial Overgrowth Syndrome (SBBOS)
Interventions
Not listed
Lead sponsor
University of Florida
Other
Eligibility
Not listed
Enrollment
944 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 25, 2012 · Synced Sep 28, 2026, 10:11 AM EDT