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Showing 1–24 of 204 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Stool Sample Collection Clear all
Completed No phase listed Observational

Fecal Microbiota Transplantation (FMT) in Clostridium Difficile Infection (CDI) Not Responding to Antibiotics

NCT03117582
View directory record Official record
Conditions
Clostridium Difficile
Interventions
Stool specimen
Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
1 Year to 99 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 27, 2022 · Synced Sep 5, 2026, 10:54 PM EDT
Not listed No phase listed Observational

Gut Microbiome and Ventricular Arrhythmias

NCT04466072
View directory record Official record
Conditions
Ventricular Tachycardia, Ventricular Fibrillation, Gut Microbiome
Interventions
Stool test for microbial analysis
Diagnostic Test
Lead sponsor
North Florida Foundation for Research and Education
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Apr 17, 2022 · Synced Sep 5, 2026, 10:54 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

A Study of the Possible Effects of Medication on Young Onset Colorectal Cancer (YOCRC)

NCT05568420
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Not listed
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years to 49 Years
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2027
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 19, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

The Role of Gut Microbiota in Heart Failure and Pre-Heart Failure With Preserved Ejection Fraction

NCT02728154
View directory record Official record
Conditions
Heart Failure
Interventions
Blood Sample, Stool Sample
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2025
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Apr 9, 2025 · Synced Sep 5, 2026, 10:54 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Gut Microbiota Composition in Hispanic and Non-Hispanic Children.

NCT03990350
View directory record Official record
Conditions
Obesity
Interventions
Fecal Sample Collection, Physical Activity Questionnaire, Food Frequency Questionnaire, 24-hour dietary recall diary
Other
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
6 Years to 12 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Wilmington, Delaware
Source: ClinicalTrials.gov public record
Updated Jun 29, 2020 · Synced Sep 5, 2026, 10:54 PM 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 12, 2021 · Synced Sep 5, 2026, 10:54 PM EDT
Completed No phase listed Observational

Helicobacter Pylori Sample Collection Protocol Pre Therapy Subjects

NCT03060746
View directory record Official record
Conditions
Helicobacter Pylori Infection, Gastric Ulcer, Nausea, Abdominal Pain, Weight Loss, Stomach Ulcer, Loss of Appetite, Bloating
Interventions
Newly Diagnosed
Other
Lead sponsor
DiaSorin Inc.
Industry
Eligibility
22 Years and older
Enrollment
277 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
11
States / cities
Mesa, Arizona • Mission Hills, California • Oxnard, California + 8 more
Source: ClinicalTrials.gov public record
Updated Dec 29, 2021 · Synced Sep 5, 2026, 10:54 PM EDT
Terminated No phase listed Observational

Monitoring of Immune and Microbial Reconstitution in (HCT) and Novel Immunotherapies

NCT03557749
View directory record Official record
Conditions
Immune and Microbial Reconstitution, Systemic Viral Infection, Acute-graft-versus-host Disease, Chronic Graft-versus-host-disease, Recurrent Malignancy, Cytokine Release Syndrome, Allogenic Related Donors, Cell Therapy/Immunotherapy Patients
Interventions
Blood Sample, Stool Sample, Urine Sample, Bronchoalveolar Lavage (BAL) fluid, Gastrointestinal biopsy x 2-4, Skin biopsy, Skin, mouth, and/or ocular swab, Apheresis Product, Final cellular product
Diagnostic Test
Lead sponsor
Masonic Cancer Center, University of Minnesota
Other
Eligibility
Not listed
Enrollment
210 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 20, 2023 · Synced Sep 5, 2026, 10:54 PM EDT
Completed No phase listed Observational

Stool Collection Sub-Study of Exact Sciences Protocol 2018-01

NCT04473625
View directory record Official record
Conditions
Colorectal Cancer, Colo-rectal Cancer, Cancer
Interventions
Stool Sample Collection
Other
Lead sponsor
Exact Sciences Corporation
Industry
Eligibility
18 Years and older
Enrollment
291 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
12
States / cities
Tucson, Arizona • Hot Springs, Arkansas • Little Rock, Arkansas + 9 more
Source: ClinicalTrials.gov public record
Updated Jun 5, 2022 · Synced Sep 5, 2026, 10:54 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Host Immune Response to Clostridium Difficile Infection in Inflammatory Bowel Disease Patients

NCT01813500
View directory record Official record
Conditions
Crohn's Disease, Ulcerative Colitis, Clostridium Difficile, Inflammatory Bowel Disease
Interventions
Blood and stool sample
Other
Lead sponsor
Boston Medical Center
Other
Eligibility
18 Years and older
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2016
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 25, 2017 · Synced Sep 5, 2026, 10:54 PM EDT
Recruiting Not applicable Interventional

Engagement of American Indians of Southwestern Tribal Nations in Cancer Genome Sequencing

NCT06207864
View directory record Official record
Conditions
Malignant Neoplasm
Interventions
Biospecimen Collection, Return of Results, Survey Administration
Procedure · Other
Lead sponsor
New Mexico Cancer Research Alliance
Other
Eligibility
18 Years and older
Enrollment
1,001 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2030
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Nov 12, 2025 · Synced Sep 5, 2026, 10:54 PM EDT
Completed No phase listed Observational

Hormonal Influences on Inflammatory Bowel Diseases

NCT05610527
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Contraception, Menstrual Problem
Interventions
Proposed study design and randomization scenarios, Repeated measures of validated Inflammatory Bowel Disease Patient Reported Outcome Instruments, Inflammatory marker collection and assessment for correlation with PRO responses and menstrual timing
Other
Lead sponsor
University of Utah
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 16, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Blood Donor CVD 5000

NCT03971669
View directory record Official record
Conditions
Risk Reduction
Interventions
Vivotif Typhoid Oral Vaccine
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2030
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 26, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Active, not recruiting No phase listed Observational

Metagenomic Evaluation of the Gut Microbiome in Patients With Lynch Syndrome and Other Hereditary Colonic Polyposis Syndromes

NCT02371135
View directory record Official record
Conditions
Lynch Syndrome, Hereditary Colonic Polyposis Syndromes
Interventions
colonic biopsies, questionnaires
Genetic
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2027
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 4, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers

CVD 37000: Immunity and Microbiome Studies at Intestinal and Systemic Sites in Ty21a Vaccinated Adults

NCT03970304
View directory record Official record
Conditions
Typhoid Vaccination
Interventions
Vivotif Typhoid Oral Vaccine
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years and older
Enrollment
87 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2027
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 6, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Genes and Environment in Multiple Sclerosis

NCT01353547
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Not listed
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
5,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2040
U.S. locations
5
States / cities
Bethesda, Maryland • Boston, Massachusetts • New York, New York + 1 more
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Blood and Stool Sample Collection in Subjects Participating in Colorectal Cancer Screening: Act Bold

NCT03821948
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Not listed
Lead sponsor
Exact Sciences Corporation
Industry
Eligibility
40 Years and older
Enrollment
5,131 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
40
States / cities
Tempe, Arizona • Chula Vista, California • Huntington Beach, California + 36 more
Source: ClinicalTrials.gov public record
Updated Jul 20, 2020 · Synced Sep 5, 2026, 10:54 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Healthy Volunteers Study

NCT06962059
View directory record Official record
Conditions
Ovarian Cancer, Genetic Predisposition to Disease
Interventions
Self-Administered Sample Collection
Other
Lead sponsor
Abramson Cancer Center at Penn Medicine
Other
Eligibility
30 Years to 50 Years · Female only
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 4, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Fecal Microbiota Transplantation in Pediatric Patients

NCT02108821
View directory record Official record
Conditions
Inflammatory Bowel Diseases (IBD), Crohn's Disease (CD), Ulcerative Colitis (UC)
Interventions
Fecal Microbiota Transplantation (FMT)
Biological
Lead sponsor
Children's Mercy Hospital Kansas City
Other
Eligibility
2 Years to 22 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Feb 3, 2021 · Synced Sep 5, 2026, 10:54 PM 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 3, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Terminated No phase listed Observational

Gut Microbiome and Depression

NCT05808101
View directory record Official record
Conditions
Multiple Sclerosis, Depression
Interventions
Neuro-QoL T-score determination
Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 12, 2024 · Synced Sep 5, 2026, 10:54 PM EDT
Suspended No phase listed Observational Accepts healthy volunteers

Genomic Resources for Enhancing Available Therapies (GREAT1.0) Study

NCT04306939
View directory record Official record
Conditions
Chronic Pancreatitis, Inflammatory Bowel Diseases, Hepatitis, NASH - Nonalcoholic Steatohepatitis, Acute Pancreatitis, Rheumatoid Arthritis, Diabetes Mellitus, Dyslipidemias, Multiple Sclerosis, Irritable Bowel Syndrome, Chronic Pain, Chronic Disease, Chronic Kidney Diseases, Crohn Disease, Celiac Disease, Biliary Cirrhosis, Bile Acid Synthesis Defect, Gastritis, Cholecystitis, Cholelithiases, IPMN, Cyst Pancreas, Cystic Fibrosis, Pancreatic Exocrine Insufficiency, Diarrhea Chronic, Constipation - Functional, Constipation Chronic Idiopathic
Interventions
venipuncture, Questionnaires, Additional Sample Collections
Other · Behavioral
Lead sponsor
University of Pittsburgh
Other
Eligibility
12 Years and older
Enrollment
120,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2026
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 6, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Active, not recruiting Phase 2 Interventional

Pirtobrutinib and Venetoclax With MRD Detection for Previously Untreated Chronic Lymphocytic Leukemia

NCT05677919
View directory record Official record
Conditions
Chronic Lymphocytic Leukemia, Small Lymphocytic Lymphoma
Interventions
Biospecimen Collection, Bone Marrow Aspiration, Bone Marrow Biopsy, Computed Tomography, Magnetic Resonance Imaging, Pirtobrutinib, Positron Emission Tomography, Venetoclax, Echocardiography, Multigated Acquisition Scan, Biopsy
Procedure · Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
72 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2030
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 11, 2026 · Synced Sep 5, 2026, 10:54 PM EDT
Completed No phase listed Observational

Schizophrenia and the Gut Microbiome

NCT02921243
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder
Interventions
Not listed
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years to 64 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Catonsville, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 18, 2019 · Synced Sep 5, 2026, 10:54 PM EDT