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ClinicalTrials.gov public records Last synced Oct 25, 2026, 4:37 PM EDT

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Showing 145–168 of 194 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Biospecimen Collection-Stool Clear all
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 29, 2018 · Synced Oct 25, 2026, 4:37 PM EDT
Withdrawn No phase listed Observational

Evaluation of Intestinal Microbiome in Obese Kids

NCT00816296
View directory record Official record
Conditions
Obesity, Non-Alcoholic Fatty Liver Disease
Interventions
Blood Draw, Stool collection, BodPod Measurement, Liver Ultrasound
Other
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
5 Years to 18 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Aug 24, 2015 · Synced Oct 25, 2026, 4:37 PM 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 25, 2026, 4:37 PM EDT
Completed No phase listed Observational

Oral Aromatase Inhibitors Modify the Gut Microbiome

NCT05030038
View directory record Official record
Conditions
Breast Cancer
Interventions
Fecal swab collection, Blood samples
Biological
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older · Female only
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Oct 25, 2026, 4:37 PM EDT
Recruiting No phase listed Observational

Evaluation of Anti-PD-1 Therapy by Monitoring T Cell Responses in Melanoma, Lung and Other Cancer Types

NCT06075524
View directory record Official record
Conditions
Clinical Stage III Cutaneous Melanoma AJCC v8, Clinical Stage IV Cutaneous Melanoma AJCC v8, Locally Advanced Lung Carcinoma, Locally Advanced Malignant Solid Neoplasm, Locally Advanced Melanoma, Metastatic Lung Carcinoma, Metastatic Malignant Solid Neoplasm, Metastatic Melanoma, Stage III Lung Cancer AJCC v8, Stage IV Lung Cancer AJCC v8
Interventions
Biospecimen Collection, Electronic Health Record Review
Procedure · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2028
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 18, 2026 · Synced Oct 25, 2026, 4:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Impact of Proton Pump Inhibitors on the Fecal Microbiome

NCT01822977
View directory record Official record
Conditions
Healthy, Clostridium Difficile Infection
Interventions
omeprazole
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Aug 20, 2014 · Synced Oct 25, 2026, 4:37 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 31, 2020 · Synced Oct 25, 2026, 4:37 PM EDT
Completed No phase listed Observational

Fecal Calprotectin Collection Protocol

NCT03143517
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Irritable Bowel Syndrome, Ulcerative Colitis, Crohn Disease, Indeterminate Colitis, Chronic Diarrhea, Celiac Disease, Diverticulitis, Abdominal Pain, Distension, Weight Loss, Food Intolerance, Constipation
Interventions
Stool collection
Diagnostic Test
Lead sponsor
DiaSorin Inc.
Industry
Eligibility
4 Years and older
Enrollment
240 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
13
States / cities
Dothan, Alabama • Little Rock, Arkansas • Mission Hills, California + 10 more
Source: ClinicalTrials.gov public record
Updated Feb 7, 2019 · Synced Oct 25, 2026, 4:37 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Human Microbiome in Immune-Mediated Diseases

NCT02394964
View directory record Official record
Conditions
Autoimmune
Interventions
Sample Collection
Other
Lead sponsor
Yale University
Other
Eligibility
18 Years and older
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2023
U.S. locations
2
States / cities
New Haven, Connecticut • New York, New York
Source: ClinicalTrials.gov public record
Updated Dec 21, 2023 · Synced Oct 25, 2026, 4:37 PM EDT
Suspended Phase 1 Interventional

The Immune Effects of Fermented Wheat Germ Nutritional Supplementation in Patients With Advanced Solid Tumor Cancers Being Treated With Standard of Care Checkpoint Inhibitors

NCT05967533
View directory record Official record
Conditions
Advanced Colorectal Carcinoma, Advanced Lung Non-Small Cell Carcinoma, Advanced Malignant Solid Neoplasm, Advanced Melanoma, Advanced Renal Cell Carcinoma, Advanced Triple-Negative Breast Carcinoma, Anatomic Stage III Breast Cancer AJCC v8, Anatomic Stage IV Breast Cancer (AJCC) v8, Clinical Stage III Cutaneous Melanoma AJCC v8, Clinical Stage IV Cutaneous Melanoma AJCC v8, Stage III Colorectal Cancer AJCC v8, Stage III Lung Cancer AJCC v8, Stage III Renal Cell Cancer AJCC v8, Stage IV Colorectal Cancer AJCC v8, Stage IV Lung Cancer AJCC v8, Stage IV Renal Cell Cancer AJCC v8
Interventions
Fermented Wheat Germ Extract
Drug
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Jul 1, 2026 · Synced Oct 25, 2026, 4:37 PM EDT
Not yet recruiting Not applicable Interventional

Gut Microbiome Changes During Abemaciclib Therapy in Breast Cancer

NCT07406594
View directory record Official record
Conditions
Breast Cancer, HER-2 Positive Breast Cancer
Interventions
Resistant Potato Starch, Placebo control
Dietary Supplement
Lead sponsor
University of Vermont Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2027 – 2031
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Oct 25, 2026, 4:37 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 7, 2026 · Synced Oct 25, 2026, 4:37 PM EDT
Recruiting No phase listed Observational

Role of Gut Microbiome in Cancer Therapy

NCT05112614
View directory record Official record
Conditions
Hematopoietic and Lymphoid Cell Neoplasm, Malignant Solid Neoplasm
Interventions
Biospecimen Collection, Electronic Health Record Review
Procedure · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 99 Years
Enrollment
3,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2030
U.S. locations
3
States / cities
Scottsdale, Arizona • Jacksonville, Florida • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 16, 2026 · Synced Oct 25, 2026, 4:37 PM EDT
Recruiting No phase listed Observational

Evaluating the Association Among Changes in Gut Microbiome, Fatigue, and Chemotherapy-Induced Nausea in Early Stage Breast Cancer

NCT05417867
View directory record Official record
Conditions
Chemotherapy-Related Nausea and/or Vomiting, Early Stage Breast Carcinoma, Anatomic Stage I Breast Cancer AJCC v8, Anatomic Stage II Breast Cancer AJCC v8
Interventions
Biospecimen Collection, Questionnaire Administration
Procedure · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
20 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
5
States / cities
Scottsdale, Arizona • Jacksonville, Florida • Albert Lea, Minnesota + 2 more
Source: ClinicalTrials.gov public record
Updated Mar 31, 2026 · Synced Oct 25, 2026, 4:37 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Role of Intestinal Inflammation in the Pathogenesis of Type 1 Diabetes

NCT01940835
View directory record Official record
Conditions
Type 1 Diabetes
Interventions
Upper endoscopy with small bowel biopsies and brushings., Blood draw, Stool sample
Procedure · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 60 Years
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2019
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 2, 2022 · Synced Oct 25, 2026, 4:37 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Blood Collection Sub-Study for CRC Screening in Individuals 45-49 at Average Risk for CRC.

NCT03741166
View directory record Official record
Conditions
Colo-rectal Cancer
Interventions
Blood Sample Collection
Other
Lead sponsor
Exact Sciences Corporation
Industry
Eligibility
45 Years to 49 Years
Enrollment
871 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
37
States / cities
Phoenix, Arizona • Camarillo, California • Laguna Hills, California + 32 more
Source: ClinicalTrials.gov public record
Updated May 17, 2021 · Synced Oct 25, 2026, 4:37 PM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers

Efficacy of Fecal Immunochemical Test Using Digital Rectal Exam

NCT03013855
View directory record Official record
Conditions
Fecal Immunochemical Test
Interventions
FIT-SOC, FIT-DRE
Device
Lead sponsor
Boston Medical Center
Other
Eligibility
50 Years to 75 Years
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 31, 2017 · Synced Oct 25, 2026, 4:37 PM 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 25, 2026, 4:37 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Does a Periaqueductal Gray-vagus Nerve Interface Malfunction Explain the Nat hx With Its Numerous Co-morbidities?

NCT06616363
View directory record Official record
Conditions
POTS - Postural Orthostatic Tachycardia Syndrome
Interventions
Questionnaires to be competed, Provide list of medication and lifetime events, Use phone App to record new life events, Will wear an activity monitor, Periodic 24-hour urine sodium check, A fMRI scan, A bedside tilt test will be performed, IV placed to collect blood samples, Stool Sample
Behavioral · Device · Other + 1 more
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
12 Years to 21 Years · Female only
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2028
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Sep 29, 2026 · Synced Oct 25, 2026, 4:37 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

A Novel Fecal Sample Collection Method for Metagenomic Analyses

NCT05172414
View directory record Official record
Conditions
Healthy
Interventions
No intervention
Other
Lead sponsor
Onegevity Health
Industry
Eligibility
18 Years to 79 Years
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 1, 2023 · Synced Oct 25, 2026, 4:37 PM EDT
Recruiting No phase listed Observational

Fatigue and Molecular Mechanisms in Cancer Patients Receiving CCRT

NCT06633224
View directory record Official record
Conditions
Cancer, Thoracic Cancer, Gynecologic Cancer, Head and Neck Cancer, Gastrointestinal Cancer
Interventions
Blood Specimen Collection, Stool Specimen Collection, Quality of Life (QOL) Questionnaires
Procedure · Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
125 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 15, 2026 · Synced Oct 25, 2026, 4:37 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 30, 2021 · Synced Oct 25, 2026, 4:37 PM EDT
Recruiting No phase listed Observational

Biospecimen and Medical Data Collection and Tumor Biopsy in Creating Research Tissue Registry in Patients With Inflammatory or Invasive Breast Cancer

NCT00477100
View directory record Official record
Conditions
Inflammatory Breast Carcinoma, Invasive Breast Carcinoma, Second Primary Malignant Neoplasm
Interventions
Biospecimen Collection, Interview, Medical Chart Review, Questionnaire Administration
Procedure · Other
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
1,200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2030
U.S. locations
10
States / cities
Gilbert, Arizona • La Jolla, California • Greeley, Colorado + 6 more
Source: ClinicalTrials.gov public record
Updated Oct 6, 2026 · Synced Oct 25, 2026, 4:37 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Blood Collection Sub-Study of Exact Sciences Protocol 2019-01: "Clinical Validation of an Optimized Multi-Target Stool DNA (Mt-sDNA 2.0) Test, For Colorectal Cancer Screening BLUE-C"

NCT04144751
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Blood Sample Collection
Other
Lead sponsor
Exact Sciences Corporation
Industry
Eligibility
40 Years and older
Enrollment
23,494 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2023
U.S. locations
194
States / cities
Birmingham, Alabama • Cullman, Alabama • Dothan, Alabama + 160 more
Source: ClinicalTrials.gov public record
Updated Sep 28, 2023 · Synced Oct 25, 2026, 4:37 PM EDT