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ClinicalTrials.gov public records Last synced Oct 31, 2026, 4:32 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 97–120 of 178 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Collection of Stool Specimens Clear all
Recruiting No phase listed Observational Accepts healthy volunteers

Study of Human Brain-Gut Axis and Gut Microbiome in Patients With Brain Lesions - Repository for Neuroscience Research

NCT06117930
View directory record Official record
Conditions
Malignant Central Nervous System Neoplasm
Interventions
Non-Interventional Study
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2029
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Feb 5, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

CVD 38000: Study of Responses to Vaccination With Typhoid and/or Cholera

NCT03705585
View directory record Official record
Conditions
Typhoid and/or Cholera Vaccination
Interventions
Vivotif Typhoid Oral Vaccine, Vaxchora
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years and older
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2029
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 4, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Stool Microbiome Using HyGIeaCare Prep

NCT04264923
View directory record Official record
Conditions
Stool Microbiome
Interventions
HyGIeaCare Prep
Other
Lead sponsor
HyGIeaCare, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Jul 31, 2020 · Synced Oct 31, 2026, 4:32 AM EDT
Completed No phase listed Observational

Evaluating Modifiable Biomarkers for the Prediction of Immunotherapy Response and Toxicity

NCT04954885
View directory record Official record
Conditions
Lung Non-Squamous Non-Small Cell Carcinoma, Stage IIIB Lung Cancer AJCC v8, Stage IV Lung Cancer AJCC v8, Stage IVA Lung Cancer AJCC v8, Stage IVB Lung Cancer AJCC v8
Interventions
Biospecimen Collection, Physical Performance Testing, Questionnaire Administration
Procedure · Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 27, 2025 · Synced Oct 31, 2026, 4:32 AM EDT
Completed Not applicable Interventional Results available

Examining Changes in Microbiota Over the Course of PTSD Treatment

NCT04109196
View directory record Official record
Conditions
Posttraumatic Stress Disorder, Depression
Interventions
Cognitive Processing Therapy
Behavioral
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years to 100 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 22, 2023 · Synced Oct 31, 2026, 4:32 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Investigating the Genetic and Phenotypic Presentation of Ataxia and Nucleotide Repeat Diseases

NCT04529252
View directory record Official record
Conditions
Spinocerebellar Ataxias, Cerebellar Ataxia, Nucleotide Repeat Disease
Interventions
Specimen collection
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
1,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2026
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

AI-EMERGE: Development and Validation of a Multi-analyte, Blood-based Colorectal Cancer Screening Test

NCT03688906
View directory record Official record
Conditions
Colo-rectal Cancer, Cancer Colon, Cancer, Rectum, Neoplasms,Colorectal, Polyps, Polyp of Colon, Adenoma, Adenoma Colon
Interventions
Not listed
Lead sponsor
Freenome Holdings Inc.
Industry
Eligibility
18 Years and older
Enrollment
3,275 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
29
States / cities
Huntsville, Alabama • Chandler, Arizona • Tucson, Arizona + 25 more
Source: ClinicalTrials.gov public record
Updated Mar 2, 2022 · Synced Oct 31, 2026, 4:32 AM EDT
Recruiting Phase 2 Interventional

A Clinical Trial of Soluble Fiber for Asthma

NCT06372249
View directory record Official record
Conditions
Asthma in Children
Interventions
Inulin
Drug
Lead sponsor
Phoenix Children's Hospital
Other
Eligibility
6 Years to 17 Years
Enrollment
105 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Mar 4, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Recruiting No phase listed Observational

Predictive Biomarkers for Pneumonitis After Chemoradiotherapy and Immunotherapy in Patients With Non-small Cell Lung Cancer

NCT04913311
View directory record Official record
Conditions
Lung Non-Small Cell Carcinoma
Interventions
Biospecimen Collection, Bronchoscopy with Bronchoalveolar Lavage, Chemoradiotherapy, Computed Tomography, Diagnostic Laboratory Biomarker Analysis, Immune Checkpoint Inhibitor, Nasal Wash and Collection, Quality-of-Life Assessment, Questionnaire Administration, Spirometry
Procedure · Other · Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
Not listed
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 11, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Exact CRC Screening Test: Stool Sample Collection Study to Support Assay Validation Testing

NCT01600209
View directory record Official record
Conditions
Colorectal Neoplasms, Digestive System Diseases, Colonic Diseases, Colorectal Cancer
Interventions
Not listed
Lead sponsor
Exact Sciences Corporation
Industry
Eligibility
50 Years to 84 Years
Enrollment
674 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
13
States / cities
Tucson, Arizona • Pomona, California • San Diego, California + 10 more
Source: ClinicalTrials.gov public record
Updated May 13, 2015 · Synced Oct 31, 2026, 4:32 AM EDT
Completed No phase listed Observational

Comparative Effectiveness of FITs With Colonoscopy

NCT03264898
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Fecal immunochemical test (FIT)
Device
Lead sponsor
Barcey T. Levy
Other
Eligibility
50 Years to 85 Years
Enrollment
3,761 participants
Timeline
2017 – 2023
U.S. locations
3
States / cities
Iowa City, Iowa • Chapel Hill, North Carolina • El Paso, Texas
Source: ClinicalTrials.gov public record
Updated Aug 2, 2024 · Synced Oct 31, 2026, 4:32 AM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Establishing a Diagnostic and Therapeutic Index in Autism Spectrum Disorder (ASD) and Fragile X Syndrome

NCT04869930
View directory record Official record
Conditions
Autism Spectrum Disorder, Fra(X) Syndrome
Interventions
specimen collection
Other
Lead sponsor
Nova Mentis Life Science Corp
Industry
Eligibility
6 Months to 21 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Fort Lauderdale, Florida
Source: ClinicalTrials.gov public record
Updated Oct 13, 2021 · Synced Oct 31, 2026, 4:32 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

BÜHLMANN fCAL™ ELISA - Aid in Differentiation of IBD From IBS

NCT02351635
View directory record Official record
Conditions
Inflammatory Bowel Disease, Irritable Bowel Syndrome
Interventions
fecal calprotectin level
Other
Lead sponsor
Bühlmann Laboratories AG
Industry
Eligibility
22 Years and older
Enrollment
478 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
7
States / cities
Palo Alto, California • Miami, Florida • Macon, Georgia + 4 more
Source: ClinicalTrials.gov public record
Updated Jan 18, 2019 · Synced Oct 31, 2026, 4:32 AM EDT
Completed No phase listed Observational

Helicobacter Pylori Sample Collection Protocol Post Therapy Subjects

NCT03060733
View directory record Official record
Conditions
Helicobacter Pylori Infection, Gastric Ulcer, Nausea, Abdominal Pain, Weight Loss, Stomach Ulcer, Loss of Appetite, Bloating
Interventions
Post-Therapy
Other
Lead sponsor
DiaSorin Inc.
Industry
Eligibility
22 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
4
States / cities
Mission Hills, California • Great Neck, New York • Mentor, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Feb 7, 2019 · Synced Oct 31, 2026, 4:32 AM EDT
Withdrawn Not applicable Interventional

The Effect of Yogurt in Cancer Patient With Moderate Gastrointestinal (GI) Symptoms

NCT03177681
View directory record Official record
Conditions
Malignant Neoplasms of Independent (Primary) Multiple Sites
Interventions
Tongue Assessment, Stool Sample, Questionnaires, Holter Monitor, Yogurt
Other · Behavioral · Device
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 27, 2023 · Synced Oct 31, 2026, 4:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Ketogenic Diet Health and Longevity

NCT05939011
View directory record Official record
Conditions
Ketogenic Dieting, Ketoses, Metabolic, Ketosis
Interventions
Well-formulated Ketogenic Diet
Behavioral
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
30 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Nov 28, 2023 · Synced Oct 31, 2026, 4:32 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Human Skin and Gut Mycobiome and Bacteriome Comprehensive Registry

NCT05196061
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Questionnaire, Stool sample, Skin swab, Oral rinse
Other
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
5,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2030
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 13, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Active, not recruiting Phase 2 Interventional

PLX038 for Treatment of Metastatic Platinum-resistant Ovarian, Primary Peritoneal, and Fallopian Tube Cancer

NCT05465941
View directory record Official record
Conditions
Platinum-Resistant Fallopian Tube Carcinoma, Platinum-Resistant Ovarian Carcinoma, Platinum-Resistant Primary Peritoneal Carcinoma, Stage IV Fallopian Tube Cancer AJCC v8, Stage IV Ovarian Cancer AJCC v8, Stage IV Primary Peritoneal Cancer AJCC v8
Interventions
Biopsy, Pegylated SN-38 Conjugate PLX038, Computed Tomography, Biospecimen Collection
Procedure · Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2030
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 16, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Completed No phase listed Observational

A Study of Immune Responses to the Virus That Causes COVID-19

NCT04431414
View directory record Official record
Conditions
SARS-CoV-2, COVID-19
Interventions
Sample collection
Other
Lead sponsor
COVID-19 Prevention Network
Network
Eligibility
18 Years and older
Enrollment
953 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
15
States / cities
Birmingham, Alabama • San Francisco, California • Miami, Florida + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 26, 2022 · Synced Oct 31, 2026, 4:32 AM EDT
Recruiting No phase listed Observational

Microbiome in Head and Neck Squamous Cell Carcinoma

NCT05837221
View directory record Official record
Conditions
Head and Neck Cancer, Lip Cancer, Oral Cancer, Pharynx Cancer
Interventions
Metagenomic sequencing, Metabolic analysis
Diagnostic Test
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 100 Years
Enrollment
60 participants
Timeline
2025 – 2028
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 24, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Suspended Not applicable Interventional

Probiotics for the Prevention of Immunotherapy Induced Colitis in Patients Receiving Immunotherapy

NCT06508034
View directory record Official record
Conditions
Malignant Solid Neoplasm
Interventions
Biospecimen Collection, Live Freeze-Dried Lactic Acid Bacteria Probiotic, Questionnaire Administration
Procedure · Dietary Supplement · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 21, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

Restoration of Antibiotics Related Infant Microbiota Perturbations by Autologous Fecal Transplant

NCT06609980
View directory record Official record
Conditions
Antibiotic Treatment
Interventions
autologous fecal matter transplant
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
1 Month to 4 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2028
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Microbiome Dysfunction in Surgical Intensive Care Unit Survivors

NCT05357170
View directory record Official record
Conditions
Sepsis, Trauma Injury
Interventions
Human feces collection
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 110 Years
Enrollment
468 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2028
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jul 9, 2026 · Synced Oct 31, 2026, 4:32 AM EDT
Completed No phase listed Observational

Collection of Blood, Urine, and Stool to Monitor MetastaticColorectal Cancers

NCT03563651
View directory record Official record
Conditions
Stage III Colorectal Cancer AJCC v8, Stage IIIA Colorectal Cancer AJCC v8, Stage IIIB Colorectal Cancer AJCC v8, Stage IIIC Colorectal Cancer AJCC v8, Stage IV Colorectal Cancer AJCC v8, Stage IVA Colorectal Cancer AJCC v8, Stage IVB Colorectal Cancer AJCC v8, Stage IVC Colorectal Cancer AJCC v8
Interventions
Biopsy, Biospecimen Collection, Laboratory Biomarker Analysis, Questionnaire Administration
Procedure · Other
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2020
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 18, 2021 · Synced Oct 31, 2026, 4:32 AM EDT