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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Stool Collection Clear all
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 27, 2023 · Synced Sep 3, 2026, 2:34 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Gut Microbiome Studies in Patients With POEMS Syndrome and Other Plasma Cell Disorders

NCT06252948
View directory record Official record
Conditions
Plasma Cell Disorders
Interventions
Non-interventional study (observational)
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2028
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 22, 2026 · Synced Sep 3, 2026, 2:34 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Variability in Microbial Response to Dietary Fiber

NCT06023940
View directory record Official record
Conditions
Microbial Colonization
Interventions
High fiber
Dietary Supplement
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
45 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 23, 2024 · Synced Sep 3, 2026, 2:34 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

A Study of Cologuard™ in an Average Risk Population Assessing a Three Year Test Interval

NCT02419716
View directory record Official record
Conditions
Colorectal Cancer Screening, Colorectal Cancer
Interventions
Cologuard
Device
Lead sponsor
Exact Sciences Corporation
Industry
Eligibility
50 Years and older
Enrollment
2,404 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2020
U.S. locations
40
States / cities
Glendale, Arizona • Mesa, Arizona • Tempe, Arizona + 34 more
Source: ClinicalTrials.gov public record
Updated Apr 1, 2020 · Synced Sep 3, 2026, 2:34 PM EDT
Recruiting Phase 4 Interventional

Rifaximin 200 mg Plus Oral Rehydration vs Oral Rehydration Alone in Children With Acute Diarrhea

NCT07285785
View directory record Official record
Conditions
Diarrhea, Gastroenteritis, Bacterial Infection, Acute Diarrhea
Interventions
Rifaximin 200 mg Tablet, Oral Rehydration Therapy (ORT)
Drug · Other
Lead sponsor
Bausch Health Americas, Inc.
Industry
Eligibility
6 Years to 12 Years
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
10
States / cities
Lynwood, California • Hialeah, Florida • Miami, Florida + 6 more
Source: ClinicalTrials.gov public record
Updated Aug 12, 2026 · Synced Sep 3, 2026, 2:34 PM EDT
Completed No phase listed Observational

Immune Response Under Immunotherapy in Metastatic NSCLC: Sputum, Blood Samples and Microbioata Study

NCT04804137
View directory record Official record
Conditions
Non-squamous Lung Cancer, Metastatic Lung Cancer
Interventions
Blood, sputum, saliva, stool
Other
Lead sponsor
University Hospital, Tours
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 16, 2024 · Synced Sep 3, 2026, 2:34 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 3, 2026, 2:34 PM EDT
Recruiting No phase listed Observational

Collecting Blood and Stool Samples to Detect Colorectal Cancer or Advanced Neoplasia in Lynch Syndrome Patients

NCT05410977
View directory record Official record
Conditions
Colorectal Carcinoma, Lynch Syndrome
Interventions
Biospecimen Collection, Electronic Health Record Review
Procedure · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
950 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
9
States / cities
Scottsdale, Arizona • San Francisco, California • Aurora, Colorado + 5 more
Source: ClinicalTrials.gov public record
Updated Aug 17, 2026 · Synced Sep 3, 2026, 2:34 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Increasing Access to Colorectal Cancer Testing (IACCT) for Blacks

NCT03078348
View directory record Official record
Conditions
Colorectal Cancer, Colorectal Carcinoma
Interventions
Fecal Immunochemical Test (FIT) Kit, Culturally targeted Photo Novella Booklet, Screen for Life Brochure
Other · Behavioral
Lead sponsor
H. Lee Moffitt Cancer Center and Research Institute
Other
Eligibility
50 Years to 75 Years
Enrollment
331 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2017
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Nov 8, 2022 · Synced Sep 3, 2026, 2:34 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

BM Collection From NICU Infants for Composition

NCT02570698
View directory record Official record
Conditions
Diaper Dermatitis
Interventions
Not listed
Lead sponsor
Kimberly-Clark Corporation
Industry
Eligibility
Up to 30 Weeks
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Aug 17, 2017 · Synced Sep 3, 2026, 2:34 PM 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 20, 2026 · Synced Sep 3, 2026, 2:34 PM EDT
Terminated Phase 1 Interventional

FMT for MDRO Colonization After Infection in Renal Transplant Recipients

NCT02922816
View directory record Official record
Conditions
Infection Due to Resistant Organism
Interventions
Fecal Microbiota Transplant (FMT), Bowel preparation, Stool or perirectal swab sampling, Fasting
Biological · Procedure · Other
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 14, 2023 · Synced Sep 3, 2026, 2:34 PM EDT
Recruiting Not applicable Interventional

The Radiation Oncology-Biology Integration Network (ROBIN) Molecular Characterization Trial (MCT) of Standard Short Course Radiotherapy for Rectal Cancer

NCT05943210
View directory record Official record
Conditions
Rectal Cancer
Interventions
Short Course Radiation Therapy (scRT), Total Mesenteric Excision (TME)
Radiation · Procedure
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years to 90 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
5
States / cities
Chicago, Illinois • New Brunswick, New Jersey • Brooklyn, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Jun 14, 2026 · Synced Sep 3, 2026, 2:34 PM EDT
Terminated Phase 1 Interventional

Vudalimab (XmAb20717) in Combination With Standard of Care Treatment in Patients With Metastatic Castration Sensitive Prostate Cancer

NCT05733351
View directory record Official record
Conditions
Castration-Sensitive Prostate Carcinoma, Metastatic Prostate Adenocarcinoma, Stage IVB Prostate Cancer AJCC v8
Interventions
Abiraterone, Biospecimen Collection, Bone Scan, Computed Tomography, Docetaxel, Enzalutamide, FDG-Positron Emission Tomography, Magnetic Resonance Imaging, PSMA PET Scan, Vudalimab
Drug · Procedure
Lead sponsor
Emory University
Other
Eligibility
18 Years and older · Male only
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
2
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Sep 14, 2025 · Synced Sep 3, 2026, 2:34 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Infant Immunity Comparison of Breastfed and Bottlefed Infants

NCT02568579
View directory record Official record
Conditions
Infant Immunity Response and Immunoglobulin Diversity
Interventions
blood sample/ stool sample
Procedure
Lead sponsor
Duke University
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
85 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
3
States / cities
Los Angeles, California • Chapel Hill, North Carolina • Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 28, 2018 · Synced Sep 3, 2026, 2:34 PM EDT
Recruiting No phase listed Observational

Assess Diversity of Gut Microbiome in Met NSCLC in Correlation to Tx & Adverse Effects

NCT06221800
View directory record Official record
Conditions
Non Small Cell Lung Cancer
Interventions
Microbiome
Diagnostic Test
Lead sponsor
University of California, Irvine
Other
Eligibility
18 Years and older
Enrollment
82 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Orange, California
Source: ClinicalTrials.gov public record
Updated Feb 4, 2026 · Synced Sep 3, 2026, 2:34 PM 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 30, 2020 · Synced Sep 3, 2026, 2:34 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Project humAn dieTary daTa rEtuRN

NCT06266689
View directory record Official record
Conditions
Diet Habit
Interventions
Personalized Diet Information
Behavioral
Lead sponsor
Duke University
Other
Eligibility
Up to 12 Months
Enrollment
600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 28, 2026 · Synced Sep 3, 2026, 2:34 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 3, 2026, 2:34 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Multiscale Omics for the Development of a Cohort Database and Study Platform in Breast Cancer Survivors

NCT04999826
View directory record Official record
Conditions
Anatomic Stage 0 Breast Cancer AJCC v8, Anatomic Stage I Breast Cancer AJCC v8, Anatomic Stage IA Breast Cancer AJCC v8, Anatomic Stage IB Breast Cancer AJCC v8, Anatomic Stage II Breast Cancer AJCC v8, Anatomic Stage IIA Breast Cancer AJCC v8, Anatomic Stage IIB Breast Cancer AJCC v8, Anatomic Stage III Breast Cancer AJCC v8, Anatomic Stage IIIA Breast Cancer AJCC v8, Anatomic Stage IIIB Breast Cancer AJCC v8, Anatomic Stage IIIC Breast Cancer AJCC v8, Prognostic Stage 0 Breast Cancer AJCC v8, Prognostic Stage I Breast Cancer AJCC v8, Prognostic Stage IA Breast Cancer AJCC v8, Prognostic Stage IB Breast Cancer AJCC v8, Prognostic Stage II Breast Cancer AJCC v8, Prognostic Stage IIA Breast Cancer AJCC v8, Prognostic Stage IIB Breast Cancer AJCC v8, Prognostic Stage III Breast Cancer AJCC v8, Prognostic Stage IIIA Breast Cancer AJCC v8, Prognostic Stage IIIB Breast Cancer AJCC v8, Prognostic Stage IIIC Breast Cancer AJCC v8
Interventions
Biospecimen Collection, Quality-of-Life Assessment, Questionnaire Administration
Procedure · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 75 Years · Female only
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 29, 2025 · Synced Sep 3, 2026, 2:34 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Fat Malabsorption in Chronic Pancreatitis

NCT02849704
View directory record Official record
Conditions
Chronic Pancreatitis
Interventions
Creon36™
Drug
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
30 Years to 70 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 2, 2019 · Synced Sep 3, 2026, 2:34 PM EDT
Completed No phase listed Observational

The Effect of the Microbiome on Immune Checkpoint Inhibitor Response in Melanoma Patients

NCT05102773
View directory record Official record
Conditions
Clinical Stage IV Cutaneous Melanoma AJCC v8, Pathologic Stage IV Cutaneous Melanoma AJCC v8
Interventions
Biospecimen Collection, Computed Tomography, Laboratory Biomarker Analysis, Questionnaire Administration
Procedure · Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
88 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 23, 2023 · Synced Sep 3, 2026, 2:34 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Addressing Colorectal Cancer in South Florida Firefighters

NCT05976282
View directory record Official record
Conditions
Colorectal Cancer, CRC
Interventions
Fecal Immunochemical Test, Septin9 Test
Other
Lead sponsor
University of Miami
Other
Eligibility
40 Years to 65 Years
Enrollment
646 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Aug 3, 2023 · Synced Sep 3, 2026, 2:34 PM EDT
Terminated Not applicable Interventional Results available

Gut Microbiome & Gastrointestinal Toxicities as Determinants of Response to Neoadjuvant Chemo for Advanced Breast Cancer

NCT02696759
View directory record Official record
Conditions
Breast Cancer
Interventions
Blood & Fecal Collection
Other
Lead sponsor
University of Arkansas
Other
Eligibility
18 Years and older · Female only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Mar 15, 2022 · Synced Sep 3, 2026, 2:34 PM EDT