National Heart, Lung, and Blood Institute (NHLBI)

Open enrollment with an early-phase pipeline tilt

According to ClinicalTrials.gov-derived indexes, National Heart, Lung, and Blood Institute (NHLBI) sits in the top decile of US sponsors by registered trial count (#73 of 15,742 sponsors by registered trial count).

501 total trials 62 currently recruiting 381 completed early-phase tilt top decile by trial count

National Heart, Lung, and Blood Institute (NHLBI): 501 sponsored US clinical trials, 62 recruiting.

National Heart, Lung, and Blood Institute (NHLBI) sponsors 501 registered US clinical trials on ClinicalTrials.gov, 62 of them currently recruiting, and 381 completed. 33 of these trials are in Phase 3-4 (later-stage) and 205 in Phase 1-2 (earlier-stage). The most-studied condition in this pipeline is Atherosclerosis, with 12 trials.

Top-decile sponsor footprint

National Heart, Lung, and Blood Institute (NHLBI) ranks in the top decile of sponsors by registered trial count (#73 of 15,742 sponsors by registered trial count). Volume at this scale usually reflects a long institutional pipeline, read phase tilt and therapeutic areas below before treating it as current-year activity.

Trial completion reliability score

C 68/100

381 of 417 decided trials (Completed vs. Terminated on ClinicalTrials.gov) reached their planned completion (91.4%), vs. national p10 68.4% / p90 100% among 1,234 sponsors with at least 10 decided trials. Still-open trials (Recruiting, Active-not-recruiting, Not-yet-recruiting) are excluded since they have not reached an outcome yet.

Open and recent trials

501 total, page 10 of 11

COMPLETED Phase 2

Immunosuppressive Preparation Followed by Blood Cell Transplant for the Treatment of Blood Cancers in Older Adults

NCT00001637

COMPLETED Phase 2

Safety and Effectiveness of Coronary Magnetic Resonance Angiography (CMRA) Imaging

NCT00001633

COMPLETED

Investigation Into the Use of Ultrasound Technique in the Evaluation of Heart Disease

NCT00001632

COMPLETED Phase 2

Study of Blood Flow in Heart Muscle

NCT00001631

COMPLETED Phase 1

Treatment of Autoimmune Thrombocytopenia (AITP)

NCT00001630

COMPLETED

Collection of Blood and Bone Marrow From Healthy Volunteers and Patients for Research Purposes

NCT00001627

COMPLETED Phase 3

The Role of Angiotensin Type I Receptor in the Regulation of Human Peripheral Vascular Function

NCT00001628

COMPLETED Phase 3

The Role of Angiotensin Type I Receptor in the Regulation of Human Coronary Vascular Function

NCT00001629

COMPLETED Phase 2

Comparing Therapies for the Treatment of Severe Aplastic Anemia

NCT00001626

COMPLETED NA

Bone Marrow Transplant Studies for Safe and Effective Treatment of Leukemia

NCT00001623

COMPLETED Phase 1

Study of the Response of Human Small Blood Vessels

NCT00001622

COMPLETED Phase 1

Effect of Insulin on Endothelin-Dependent Vascular Tone in the Forearm Circulation

NCT00001624

COMPLETED

Evaluation and Treatment of Patients With Lung Disease Not Participating in Research

NCT00001621

COMPLETED

Segmental Bronchoalveolar Lavage

NCT00001618

COMPLETED

Magnetic Resonance Imaging at Different Levels of Magnetic Intensity

NCT00001619

COMPLETED Phase 1

Treatment of T-Large Granular Lymphocyte (T-LGL) Lymphoproliferative Disorders With Cyclosporine

NCT00001533

COMPLETED

Long Term Effects of Enalapril and Losartan on Genetic Heart Disease

NCT00001534

COMPLETED

Potential Role of CMV in Restenosis Following Angioplasty, in Atherosclerosis, and in Endothelial Dysfunction

NCT00001531

COMPLETED

Long-Term Results of DDD Pacing in Obstructive Hypertrophic Cardiomyopathy

NCT00001530

COMPLETED

Analysis of Heart Muscle Function Following Exercise in Patients With Heart Disease

NCT00001528

COMPLETED

The Women's Health Initiative Memory Study (The WHIMS Study)

NCT00685009

COMPLETED

Role of Endothelin in the Regulation of Vascular Tone in Patients With Essential Hypertension

NCT00001527

COMPLETED

Effect of High Levels of Oxygen and Smoking on the Lungs in Human Volunteers

NCT00001464

COMPLETED

Characterization of the Pathobiology of Early Lung Destruction in Alpha 1-Antitrypsin Deficient Individuals

NCT00001462

COMPLETED

Study of the Interaction Between the Cells Lining Blood Vessels and Angiotensin-Converting Enzyme

NCT00001461

COMPLETED

Evaluation of Patients With Heart Disease Not Eligible for Research Protocols

NCT00001458

COMPLETED NA

Evaluation and Treatment of Heart Disease in Patients Not Participating in Research

NCT00001460

COMPLETED

Analysis of Heart Muscle Function in Patients With Heart Disease and Normal Volunteers

NCT00001459

COMPLETED Phase 3

Acute Respiratory Distress Syndrome Clinical Network (ARDSNet)

NCT00000579

COMPLETED Phase 2

PET Scan to Determine Areas of Blood Flow and Activity in the Hearts of Patients With Heart Disease Taking Beta-Blockers

NCT00001402

COMPLETED Phase 1

Gene Therapy for the Treatment of Fanconi's Anemia Type C

NCT00001399

COMPLETED

Outpatient Evaluation of Patients With Known or Suspected Heart Disease

NCT00001400

COMPLETED

Evaluation, Treatment, and Training for Patients With Blood Disorders

NCT00001397

COMPLETED Phase 1

Natural History and Results of Dual Chamber (DDD) Pacemaker Therapy of Children With Obstructive Hypertrophic Cardiomyop...

NCT00001396

COMPLETED Phase 1

Stem Cell Factor Medication for Aplastic Anemia

NCT00001398

COMPLETED

Evaluation of Patients With Known or Suspected Heart Disease

NCT00001313

COMPLETED

Investigation of Heart Function in Patients With Heart Valve Defects

NCT00001314

COMPLETED Phase 3

Trial of Nonpharmacologic Interventions in Elderly (TONE)

NCT00000535

COMPLETED

Cardiovascular Evaluation of Patients With High Cholesterol and Normal Volunteers

NCT00001204

COMPLETED

Diagnosis and Treatment of Pheochromocytoma

NCT00001229

COMPLETED

Lipoprotein Metabolism in Normal Volunteers and Patients With Abnormal Levels of Lipoproteins

NCT00001226

COMPLETED

Family Studies of Inherited Heart Disease

NCT00001225

COMPLETED

Collection of Blood From Patients With Pancytopenia

NCT00001214

COMPLETED

Deferoxamine for the Treatment of Hemochromatosis

NCT00001203

COMPLETED

Evaluating Electrocardiogram (ECG) Abnormalities From Young Adulthood Through Middle Age

NCT00556751

COMPLETED

Evaluation of the Causes and Disease Processes of Chronic Lung Disease

NCT00001183

COMPLETED Phase 2

Hydroxyurea for the Treatment of Patients With Sickle Cell Anemia

NCT00001197

COMPLETED

Effects of Salt Intake on the Nervous Systems of Patients With Salt-Sensitive High Blood Pressure

NCT00001176

COMPLETED

Evaluation of Lipoproteins

NCT00001168

COMPLETED

Lipoprotein Metabolism in Normal Volunteers and Patients With High Levels of Lipoproteins

NCT00001154

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Phase Distribution

PhaseTrial count
Phase 1 87
Phase 2 118
Phase 3 29
Phase 4 4

What is open in the National Heart, Lung, and Blood Institute (NHLBI) pipeline

62 recruiting of 501 indexed (12% open); 381 completed (76%).

Phase mix: 33 late (III/IV) vs 205 early (I/II) (early-phase heavy).

Top condition: Atherosclerosis (12 trials), 9 others listed.

How open-pipeline share is computed

Recruiting share is recruiting_count divided by trial_count for this sponsor in the public registry export. Status can change between pulls; treat the figure as a research-attention snapshot, not product availability.

National Heart, Lung, and Blood Institute (NHLBI): open-pipeline peers nationwide

Peers matched on 501 registered trials and 12% open enrollment, not the therapeutic-area sidebar.

National Heart, Lung, and Blood Institute (NHLBI) sits at or above the median trial volume and at or above the median recruiting share among these 9 nationwide peers -- the two do not always move together. Source: ClinicalTrials.gov (2026-08-08 snapshot). 2×2 strategic matrix plotting 9 entities by Total trials (X) and Recruiting share (Y), with a crosshair dividing the plot into four quadrants. Higher volume & more openFocused & more openHigher volume, mostly closedSmaller & mostly closed 05001,0001,500 0%5%10%15%20% Total trials Recruiting share National Heart, Lung, and Blood Institute (NHLBI)H. Lee Moffitt Cancer Center and Research InstituteGilead SciencesNational Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)Beth Israel Deaconess Medical CenterBoston UniversityAstraZenecaDaiichi SankyoUniversity of Iowa
National Heart, Lung, and Blood Institute (NHLBI) sits at or above the median trial volume and at or above the median recruiting share among these 9 nationwide peers -- the two do not always move together. Source: ClinicalTrials.gov (2026-08-08 snapshot).

National Heart, Lung, and Blood Institute (NHLBI) sits at or above the median trial volume and at or above the median recruiting share among these 9 nationwide peers -- the two do not always move together.

Sponsors near 501 trials (± recruiting share)

Sponsors near 12% open enrollment (± trial volume)

What to do with this National Heart, Lung, and Blood Institute (NHLBI) page

501 registered trials is a research-attention snapshot, not an endorsement of National Heart, Lung, and Blood Institute (NHLBI) or any single study.

  • 62 of National Heart, Lung, and Blood Institute (NHLBI)'s trials are currently recruiting, check each one's own eligibility criteria before contacting a site. Browse recruiting trials
  • Atherosclerosis is the condition National Heart, Lung, and Blood Institute (NHLBI) studies most, compare against other sponsors active in the same condition before evaluating a specific study. See Atherosclerosis 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. National Heart, Lung, and Blood Institute (NHLBI) pipeline card: 501 registered trials from official public datasets. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.