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Showing 1–24 of 330 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Breath test Clear all
Terminated No phase listed Observational Accepts healthy volunteers

Breath Analysis in Early Stage Lung Cancer Using Infrared Spectroscopy

NCT04556435
View directory record Official record
Conditions
Lung Cancer, Non Small Cell Lung Cancer
Interventions
Not listed
Lead sponsor
Breathe BioMedical Inc
Industry
Eligibility
18 Years and older
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Orange, California
Source: ClinicalTrials.gov public record
Updated Nov 17, 2023 · Synced Sep 2, 2026, 1:51 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Influence of Lifestyle Factors on Neutrophil Migration Pilot Study

NCT02411318
View directory record Official record
Conditions
Neutrophil Chemotactic Response
Interventions
Exercise, ProLab 200mg caffeine capsule, Ethanol ingestion, Glucose Tolerance Drink
Behavioral · Drug · Other
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
21 Years to 60 Years
Enrollment
47 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2019
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 16, 2020 · Synced Sep 2, 2026, 1:51 AM EDT
Completed Phase 2 Interventional Results available

BREATHID Octanoate Breath Test With or Without Methacetin Breath Test for Correlation With Biopsy in NASH

NCT02314026
View directory record Official record
Conditions
Non-Alcoholic Steatohepatitis
Interventions
Suspected NASH BreathID test with 13C-Octanoate, Suspected NASH Breath test with 13C Methacetin
Device
Lead sponsor
Meridian Bioscience, Inc.
Industry
Eligibility
18 Years and older
Enrollment
140 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
8
States / cities
Chicago, Illinois • Forts Sam Houston, Texas • Houston, Texas + 3 more
Source: ClinicalTrials.gov public record
Updated Dec 19, 2022 · Synced Sep 2, 2026, 1:51 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

GEBT Lot-to-Lot and Biological Variability

NCT04772261
View directory record Official record
Conditions
Gastroparesis
Interventions
13C-Spirulina GEBT
Diagnostic Test
Lead sponsor
Cairn Diagnostics
Industry
Eligibility
18 Years to 85 Years
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Brentwood, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 17, 2022 · Synced Sep 2, 2026, 1:51 AM EDT
Completed No phase listed Observational

A Prospective Validation Study of a Rapid Point-of-Care Breath Test for Breast Cancer

NCT02888366
View directory record Official record
Conditions
Breast Cancer
Interventions
Not listed
Lead sponsor
Menssana Research, Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
4
States / cities
Los Angeles, California • Montclair, New Jersey • Newark, New Jersey + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 28, 2018 · Synced Sep 2, 2026, 1:51 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Transit Time and Bacterial Overgrowth Using SmartPill Capsule

NCT00577772
View directory record Official record
Conditions
Small Bowel Bacterial Overgrowth, Gastrointestinal Diseases, Stomach Diseases, Digestive System Diseases
Interventions
Xifaxan, SmartPill, Lactulose hydrogen breath test (H_2BT)
Drug · Device · Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 70 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Oct 4, 2012 · Synced Sep 2, 2026, 1:51 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

A Micro/Nano Device for Exhaled Breath Analysis

NCT02123030
View directory record Official record
Conditions
Lung Cancer, Pulmonary Disease
Interventions
Not listed
Lead sponsor
University of Louisville
Other
Eligibility
20 Years to 85 Years
Enrollment
728 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2018
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Jun 17, 2021 · Synced Sep 2, 2026, 1:51 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Normal Breathing and Swallowing in Healthy Volunteers

NCT03122145
View directory record Official record
Conditions
Healthy
Interventions
Capsaicin, Videofluoroscopic swallow study
Drug · Device
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 100 Years
Enrollment
49 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 13, 2021 · Synced Sep 2, 2026, 1:51 AM EDT
Completed No phase listed Observational Results available

Prediction Value of the BreathID 13C-Methacetin Breath Test for Hepatic Decompensation

NCT02084160
View directory record Official record
Conditions
Chronic Liver Disease
Interventions
Not listed
Lead sponsor
Meridian Bioscience, Inc.
Industry
Eligibility
18 Years and older
Enrollment
579 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
3
States / cities
Detroit, Michigan • Charleston, South Carolina • Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Dec 19, 2022 · Synced Sep 2, 2026, 1:51 AM EDT
Terminated Not applicable Interventional Results available

Electronic Nose Identification of Fasting and Non-fasting Breath Profiles

NCT02419976
View directory record Official record
Conditions
Fasting
Interventions
a breath analysis using the Aeonose, Aeonose
Other · Device
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
879 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2024
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 25, 2026 · Synced Sep 2, 2026, 1:51 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Stress-motivated Alcohol Use as a Value-based Decision-making Process

NCT06264791
View directory record Official record
Conditions
Psychological Stress, Alcohol Intoxication
Interventions
Stress, Alcohol
Other
Lead sponsor
University of Washington
Other
Eligibility
21 Years to 50 Years
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jan 29, 2026 · Synced Sep 2, 2026, 1:51 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Utilizing Novel Blood RNA Biomarkers as a Diagnostic Tool in the Identification of Long COVID-19

NCT06311435
View directory record Official record
Conditions
Long COVID
Interventions
RNA Biomarker Blood Test
Diagnostic Test
Lead sponsor
MaxWell Clinic, PLC
Industry
Eligibility
18 Years and older
Enrollment
224 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
2
States / cities
Iowa City, Iowa • Brentwood, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 17, 2024 · Synced Sep 2, 2026, 1:51 AM 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 4, 2026 · Synced Sep 2, 2026, 1:51 AM 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 16, 2018 · Synced Sep 2, 2026, 1:51 AM 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 15, 2022 · Synced Sep 2, 2026, 1:51 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 2, 2026, 1:51 AM 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 17, 2013 · Synced Sep 2, 2026, 1:51 AM EDT
Terminated Phase 2 Interventional

BreathID Multi-center HCV Liver Breath Test Study

NCT00350714
View directory record Official record
Conditions
Hepatitis C
Interventions
MBT and BreathID
Other
Lead sponsor
Meridian Bioscience, Inc.
Industry
Eligibility
18 Years and older
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
4
States / cities
New York, New York • Houston, Texas • Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Dec 19, 2022 · Synced Sep 2, 2026, 1:51 AM EDT
Completed Phase 3 Interventional Results available

Weight Loss in Parkinson's Disease and Role of Small Bowel Bacterial Overgrowth

NCT01662791
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Rifaximin
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Aug 3, 2016 · Synced Sep 2, 2026, 1:51 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 2, 2026, 1:51 AM 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 7, 2023 · Synced Sep 2, 2026, 1:51 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 2, 2026, 1:51 AM EDT
Recruiting Not applicable Interventional

H. Pylori Eradication With Argon Plasma During Endoscopy

NCT06529159
View directory record Official record
Conditions
Helicobacter Pylori Infection, Helicobacter Pylori, Helicobacter Pylori Gastrointestinal Tract Infection, H. Pylori Infection, H. Pylori Gastrointestinal Disease
Interventions
HEAPE, Pre-HEAPE
Procedure
Lead sponsor
Christopher C. Thompson, MD, MSc
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 1, 2026 · Synced Sep 2, 2026, 1:51 AM 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 12, 2021 · Synced Sep 2, 2026, 1:51 AM EDT