Longitudinal Immunophenotyping of Patients With Inflammatory Bowel Disease

What this study involves

The registry says this study is recruiting. Individual locations may have different availability.

Study type

Observational

Phase

Not applicable / not listed

Age range

18 years - 85 years

Sex eligible

All sexes

Healthy volunteers

Not accepted

Participants

100 Estimated

These are starting points, not an eligibility decision. The research team must review the full requirements.

About the research

Background:

Inflammatory bowel disease (IBD) is a term used to describe disorders that cause long-term inflammation in the digestive tract. Symptoms include stomach pain, diarrhea, and bleeding. Crohn's disease and ulcerative colitis are the 2 main types of IBD. Researchers want to conduct a natural history study to learn more about whether genetic factors can cause IBD; how immune cells contribute to IBD; and how diet, drugs, and disease affect those cells.

Objective:

To better understand IBD over time.

Eligibility:

Adults aged 18 to 85 years with Crohn's disease, ulcerative colitis, or another IBD. Their healthy relatives are also needed.

Design:

Affected participants will have clinic visits every 6 months for 3 years.

Once a year, they will have these procedures:

A physical exam with blood and stool samples.

Ultrasound of the abdomen. A wand will be rolled over the skin. It uses sound waves to capture images of the intestines.

Magnetic resonance imaging (MRI) scan. They will lie on a table that slides into a tube. Magnetic fields will capture images of the intestines.

Colonoscopy. A long, flexible tube with a video camera will be inserted into the rectum to view the entire colon. Up to 12 tissue samples may be taken.

Upper endoscopy, for those with Crohn's disease. A long, thin tube with a camera will be inserted through the mouth and into the first part of the small intestine. Up to 12 small tissue samples may be taken.

Questionnaires. Participants will answer questions about their disease and their diet.

Midyear visits will include a physical exam, blood and stool collection, ultrasound, and questionnaires

Healthy relatives will have 1 blood draw for genetic tests.

Who may be able to participate?

The list below is the sponsor’s full registry wording. It can include conditions, prior treatment, test results and other requirements. A match in search does not mean you qualify.

• INCLUSION CRITERIA

In order to be eligible to participate in this study, an individual must meet all of the following criteria:

Affected Participant cohort:

1. Adults 18 - 85 years of age
2. History of:

1. a verifiable diagnosis of Crohn's disease, ulcerative colitis, or IBD known to be associated with a co-existing condition (such as CTLA4 deficiency or common variable immune deficiency) and which is supported by characteristic clinical features, radiographic or endoscopic findings, or consistent histopathologic mucosal changes related to chronic inflammation; and/or
2. a defined genetic syndrome/mutation linked to inflammatory bowel disease risk with or without symptoms or findings consistent with IBD
3. Presence of a referring community physician who would be able to manage care outside of NIH

Unaffected family member of participant: immediate relative to the enrolled participant (mother, father, sibling, or adult child) may be recruited and enrolled to improve interpretation of genetic results or expand the phenotype of the IBD

1. Adults 18 - 99 years of age
2. In good general health
3. No medical diagnosis of IBD

EXCLUSION CRITERIA

An individual who meets any of the following criteria will be excluded from participation in this study:

1. Unable or unwilling to provide informed consent
2. Evidence of significant medical illnesses that the investigators feel may interfere with study evaluations and procedures

Study population

Patients with known or suspected inflammatory bowl disease

Treatment, groups and participation

The registry may describe treatments and study duration without a complete visit calendar. Ask the study team for the exact schedule, procedures, risks, costs and alternatives. Keep your usual care plan unless your treating clinician tells you otherwise.

Assignment

Not reported

Masking

Not reported

What researchers are measuring

Outcome measures describe what is being studied. They are not proof that a treatment works.

Primary measures

Research locations (1)

The overall study status and a local site’s status can differ. Confirm that location’s availability before traveling.

1 locations

Study team and timeline

Lead sponsor

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

Study start

Nov 5, 2026 Actual

Primary completion

Jun 1, 2036 Estimated

Study completion

Jun 1, 2036 Estimated

First posted

Jun 2, 2026 Actual

Last updated

Nov 10, 2026 Actual

Official study contacts