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Massive study aims to unravel mysteries of blood clots and vessel disease

NCT ID NCT06552767

Knowledge-focused Sponsor: National Heart, Lung, and Blood Institute (NHLBI) Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Sep 11, 2026 · Updated 12 times

Summary

This study aims to learn more about how diseases related to blood clots, the immune system, and blood vessels start and change over time. Researchers will enroll up to 1,000 people aged 5 and older, including those with these conditions, their healthy relatives, and healthy volunteers. Participants will undergo various tests and procedures, such as blood tests, imaging scans, and heart function tests, with optional follow-up for up to 7.5 years.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 1,000 people

The number the study aims to enrol. It can still change while the study runs.

Started

Nov 2024

Expected to finish

Jan 2034

An estimate. End dates often move.

Lead sponsor

A government research agency

The lead sponsor is the US National Institutes of Health.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Participants with relevant immune, inflammation, thrombotic and/or vascular diseases and their relatives Healthy volunteers

Ages

5 to 100 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

* INCLUSION CRITERIA: In order to be eligible to participate in this study, an individual must meet all of the following criteria: * Age \>= 5 years at the time of consent * Ability of subject or Legally Authorized Representative (LAR) as applicable to understand and the willingness to sign a written informed consent document In addition, the following cohort-specific inclusion criteria apply: Affected Subjects: -Known or possible thrombotic, immune, or vascular disorder after review of the subject s medical records and/or discussion of medical history Relatives of Affected Subjects: -Being a relative of an affected subject Unrelated Healthy Controls: -In good general health as evidenced by medical history EXCLUSION CRITERIA: An individual who meets any of the following criteria will be excluded from participation in this study: -Any condition that in the opinion of the Investigator would warrant exclusion Unrelated Healthy Controls: * Unrelated healthy volunteers who decline to have blood drawn and/or tissue studies or who do not consent to have samples stored for future research * Cognitively impaired individuals

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Conditions

The condition(s) this trial relates to.

cardiovascular disorder immune system disorder thrombotic disease vascular disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Cardiovascular diseases Vascular diseases

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • National Institutes of Health Clinical Center

    RECRUITING

    Bethesda, Maryland, 20892, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.