How many clinical trials are there for Undiagnosed Diseases?

PlainTrial tracks 2 US clinical trials for Undiagnosed Diseases, of which 2 are currently recruiting.

How do I find a recruiting trial for Undiagnosed Diseases?

Use the trial list filtered by Recruiting status, or visit the trial finder to search by condition and state. Always discuss with your healthcare provider.

Is this data current?

Data is from ClinicalTrials.gov. Trial status may have changed. Always verify at ClinicalTrials.gov before making participation decisions.

Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.

ClinicalTrials.gov 2 recruiting now small index

Undiagnosed Diseases clinical trials

Compiled by PlainTrial · August 8, 2026

2 of 2 indexed Undiagnosed Diseases trials are currently recruiting.

Corpus placement: #7,188 of 28,707 conditions by registered trial count.

Jump to open trials → Trial finder

2 US clinical trials · 2 currently recruiting · #7,188 of 28,707 conditions by registered trial count

Undiagnosed Diseases: 2 US clinical trials tracked, 2 recruiting.

Undiagnosed Diseases is the subject of 2 registered US clinical trials on ClinicalTrials.gov, 2 of them currently open to new participants. The most active sponsor is National Heart, Lung, and Blood Institute (NHLBI), running 1 of these trials.

Enrollment posture brief

Registry condition undiagnosed-diseases

Volume-matched condition peers

Nearest open-share peer: Aortic Arch Aneurysm (100% recruiting · 5 trials)

Open-enrollment share among volume-matched conditions near Undiagnosed Diseases

Undiagnosed Diseases lists 2 open slots (100% of 2 indexed trials). Peers are matched on registered volume, not therapeutic-area browse lists. How peer matching works →

Key findings

What ClinicalTrials.gov does not surface for Undiagnosed Diseases on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.

Undiagnosed Diseases is recruiting above its size-band peers.

2 of 2 indexed trials (100%) are open to enrollment, against a 46.5% average across 27,806 conditions with fewer than 20 trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.

Open and recent trials

2 total, page 1 of 1

RECRUITING 10,000 participants

Human Biospecimen Procurement Protocol: Biorepository to Support Translational Research to Identify Disease Mechanism(s)

National Heart, Lung, and Blood Institute (NHLBI)

NCT02543996

RECRUITING 2,800 participants

Caregiving Networks Across Disease Context and the Life Course

National Human Genome Research Institute (NHGRI)

NCT05007990

Phase Distribution

Phase data not available

Top Sponsors

National Heart, Lung, and Blood Institute (NHLBI) 1 trials

National Human Genome Research Institute (NHGRI) 1 trials

US sites by state

Facility locations filed on Undiagnosed Diseases trials. A trial with sites in several states counts in each.

Maryland 2 trials

Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.

Read our methodology - how this data is sourced, computed, and verified.

What to do with this Undiagnosed Diseases page

2 registered trials, 2 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.

2 Undiagnosed Diseases trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
National Heart, Lung, and Blood Institute (NHLBI) sponsors the most Undiagnosed Diseases trials on record, review their full trial history before evaluating a specific study. See National Heart, Lung, and Blood Institute (NHLBI)'s trials
Bring the specific trial ID (NCT number) to your own doctor before enrolling, this page is a directory, not medical guidance. Read the trial-finding guide

Trial and recruiting counts reflect ClinicalTrials.gov registry status as of the data vintage above; individual trial eligibility and enrollment status can change.

Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. This Undiagnosed Diseases condition card totals 2 registered trials; top US site state Maryland. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.