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Showing 1–24 of 83 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Breath Sample Clear all
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 3, 2026, 5:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Smartphone-based Financial Incentives

NCT03922360
View directory record Official record
Conditions
Tobacco Use Disorder
Interventions
Smartphone-based Financial Incentives, Best Practices
Behavioral
Lead sponsor
University of Vermont
Other
Eligibility
18 Years and older · Female only
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 3, 2026, 5:30 AM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

Bacterial Overgrowth Associated With Chronic Multisymptom Illness Complex

NCT00956150
View directory record Official record
Conditions
Gulf War Syndrome
Interventions
Lactulose Breath Test, Rifaximin, Placebo
Procedure · Drug
Lead sponsor
Henry C. Lin, MD
Federal
Eligibility
21 Years and older
Enrollment
210 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2009
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Apr 30, 2013 · Synced Sep 3, 2026, 5:30 AM EDT
Terminated No phase listed Observational

Volatiles in Exhaled Breath and Blood in Crohn's Disease: Validation Cohort

NCT02641171
View directory record Official record
Conditions
Crohn's Disease
Interventions
Specimen sampling
Other
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Lebanon, New Hampshire
Source: ClinicalTrials.gov public record
Updated Jul 11, 2018 · Synced Sep 3, 2026, 5:30 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Diagnostic Breath Analysis for Detection of Ventilator Acquired Pneumonia (VAP)

NCT03053258
View directory record Official record
Conditions
Bacterial Infections
Interventions
Collection of exhaled breath sample
Device
Lead sponsor
Landon Pediatric Foundation
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated May 6, 2019 · Synced Sep 3, 2026, 5:30 AM EDT
Completed Not applicable Interventional

Surrogate Markers of Portal Pressure

NCT02508298
View directory record Official record
Conditions
Portal Hypertension, Cirrhosis
Interventions
HVPG, Indocyanine Green Retention test, Liver stiffness measurement, Spleen stiffness measurement
Procedure · Drug · Device
Lead sponsor
VA Connecticut Healthcare System
Federal
Eligibility
18 Years to 85 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
2
States / cities
New Haven, Connecticut • West Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 24, 2019 · Synced Sep 3, 2026, 5:30 AM EDT
Terminated No phase listed Observational

Breath Metabolomics in the Laboring Parturient

NCT04564196
View directory record Official record
Conditions
Labor Onset and Length Abnormalities
Interventions
Breath Sample
Procedure
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older · Female only
Enrollment
53 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Jun 7, 2023 · Synced Sep 3, 2026, 5:30 AM EDT
Completed Phase 2Phase 3 Interventional Results available

13C-Methacetin Breath Test for the Prediction of Outcome in in ALI or ALF

NCT02786836
View directory record Official record
Conditions
Acute Liver Failure
Interventions
13C-Methacetin
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
11
States / cities
Birmingham, Alabama • San Francisco, California • New Haven, Connecticut + 8 more
Source: ClinicalTrials.gov public record
Updated Dec 21, 2020 · Synced Sep 3, 2026, 5:30 AM EDT
Completed Not applicable Interventional

Contingency Management for Smoking Cessation in the Homeless

NCT01736982
View directory record Official record
Conditions
Cigarette Smoking
Interventions
Contingency Management, Standard of Care
Behavioral · Other
Lead sponsor
UConn Health
Other
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
New Britain, Connecticut
Source: ClinicalTrials.gov public record
Updated Jan 15, 2018 · Synced Sep 3, 2026, 5:30 AM 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 6, 2016 · Synced Sep 3, 2026, 5:30 AM 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 29, 2021 · Synced Sep 3, 2026, 5:30 AM EDT
Terminated Not applicable Interventional Results available

Metabolic and Microbial Profiling of Lung Cancer

NCT03998189
View directory record Official record
Conditions
Nonsmall Cell Lung Cancer, Nonsmall Cell Lung Cancer Stage
Interventions
Breath Collection, Saliva Collection, Blood Collection, Urine Collection, Tumor Collection, Medical History Data Collection
Other
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 4, 2021 · Synced Sep 3, 2026, 5:30 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Impact of E-cigarette Use on the Body

NCT04972513
View directory record Official record
Conditions
Cigarette Smoking-Related Carcinoma
Interventions
Biospecimen Collection, Nitric Oxide Breath Test, Oscillometry, Spirometry, Survey Administration, Endothelial function
Procedure · Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
15 Years to 25 Years
Enrollment
182 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 22, 2026 · Synced Sep 3, 2026, 5:30 AM EDT
Terminated Not applicable Interventional

Incentives to Promote Smoking Cessation in Low SES Women

NCT03173274
View directory record Official record
Conditions
Nicotine Dependence
Interventions
Brief Motivational Intervention, Contingency Management, Non-Contingent Reinforcement
Behavioral
Lead sponsor
Brown University
Other
Eligibility
18 Years and older · Female only
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Mar 3, 2019 · Synced Sep 3, 2026, 5:30 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 3, 2026, 5:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Comparison of Capnography Sampling Lines

NCT03554629
View directory record Official record
Conditions
Capnography
Interventions
Capnography CO2 cannula sampling Flexiterline (CCSF) designs with supplemental O2
Device
Lead sponsor
Medtronic - MITG
Industry
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Louisville, Colorado
Source: ClinicalTrials.gov public record
Updated Jan 5, 2021 · Synced Sep 3, 2026, 5:30 AM EDT
Completed Not applicable Interventional

Remote Monitoring and Contingency Management Reinforcement for Alcohol Abstinence

NCT01307345
View directory record Official record
Conditions
Alcohol Use
Interventions
contingency management for abstinence
Behavioral
Lead sponsor
UConn Health
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated Jul 19, 2018 · Synced Sep 3, 2026, 5:30 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Role of Acetaldehyde in the Development of Oral Cancer

NCT05973656
View directory record Official record
Conditions
Alcohol-Related Carcinoma, Fanconi Anemia, Oral Cavity Carcinoma
Interventions
Alcohol, Biospecimen Collection, Breath Test
Drug · Procedure
Lead sponsor
Masonic Cancer Center, University of Minnesota
Other
Eligibility
18 Years to 45 Years
Enrollment
170 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2027
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 21, 2026 · Synced Sep 3, 2026, 5:30 AM EDT
Completed Not applicable Interventional

Contingency Management to Reduce Alcohol Use in a Soup Kitchen Sample

NCT02499913
View directory record Official record
Conditions
Alcohol Abuse, Contingency Management
Interventions
breath alcohol monitoring, contingency management
Behavioral
Lead sponsor
UConn Health
Other
Eligibility
18 Years and older
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
New Britain, Connecticut
Source: ClinicalTrials.gov public record
Updated Jun 25, 2017 · Synced Sep 3, 2026, 5:30 AM 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 13, 2022 · Synced Sep 3, 2026, 5:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Pivot Breath Sensor Performance Study

NCT03870022
View directory record Official record
Conditions
Smoking Cessation, Smoking, Tobacco
Interventions
Pivot Breath Sensor System, Similar Carbon Monoxide breath sensor system
Device
Lead sponsor
Jennifer Marler, MD
Industry
Eligibility
18 Years to 80 Years
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Redwood City, California
Source: ClinicalTrials.gov public record
Updated Jun 30, 2024 · Synced Sep 3, 2026, 5:30 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Comparison of Smoking and Vaping in Families

NCT02500238
View directory record Official record
Conditions
Smoking
Interventions
Saliva sample, Urine Sample, Toe nail clippings, Breath carbon monoxide test
Other
Lead sponsor
University of Florida
Other
Eligibility
6 Years to 17 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
2
States / cities
Gainesville, Florida • Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Dec 27, 2018 · Synced Sep 3, 2026, 5:30 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Feasibility of Breathwork Intervention With Older Adults After Knee Surgery

NCT07464860
View directory record Official record
Conditions
Surgical Stress Response, Stress Physiological, Stress Physiology, Stress Psychological, Breathing Techniques, Breathing Exercises, Hypothalamic Pituitary Adrenal, Relaxation, Relaxation Therapy, Cortisol, Postoperative Pain, Postoperative Anxiety, Postoperative Depression, Quality of Recovery (QoR-15)
Interventions
A 5-minute Asynchronous Breathwork Intervention, A 5-minute Asynchronous Card Game Video
Behavioral
Lead sponsor
University of Arizona
Other
Eligibility
65 Years and older
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Jul 5, 2026 · Synced Sep 3, 2026, 5:30 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 3, 2026, 5:30 AM EDT