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7,120 recruiting studies with US sites, from the official ClinicalTrials.gov registry (refreshed Oct 26, 2026). No sign-up needed.
Most recently updated studies · page 137 of 297
- RecruitingHealthy volunteers
Natural History of Dysregulation and Aging of the Immune System in People With Trisomy 21 With and Without Thymectomy
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 1–120
- RecruitingHealthy volunteers
Sleep and Adolescent Vaccine Immunogenicity Pilot/Observational Study
Children's Hospital Medical Center, Cincinnati
- Location
- Cincinnati, OH
- Eligibility basics
- Ages 11–12
- RecruitingHealthy volunteers
Improving Jail Response to the Overdose Crisis: A Hybrid Trial of Jail ECHO to Improve MOUD Implementation and Public Health Outcomes
University of Massachusetts, Worcester
- Location
- Worcester, MA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Improving Student Mental Health Through a Universal Trauma-Informed Intervention
Johns Hopkins Bloomberg School of Public Health
- Location
- Baltimore, MD + 2 other US sites
- Eligibility basics
- Ages 12–15
- RecruitingHealthy volunteers
Immune Regulation in Ulcerative Colitis or Crohn s Disease
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 0 mo–75
- RecruitingHealthy volunteers
Von Hippel-Lindau (VHL): Clinical Manifestations, Diagnosis, Management and Molecular Bases of Inherited Renal and Other Urologic Malignant Disorders
National Cancer Institute (NCI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 2+
- RecruitingHealthy volunteers
Viral Load in Blood and Lymph Tissues in People Living With HIV
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–100
- RecruitingHealthy volunteers
Fungal Infection Susceptibility
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–99
- RecruitingHealthy volunteers
Studies of Blood Flow to the Brain During Thought
National Institute of Mental Health (NIMH)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Role of Genetic Factors in the Development of Lung Disease
National Heart, Lung, and Blood Institute (NHLBI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 2–90
- RecruitingHealthy volunteers
COLLECT BLOOD/RESEARCH USE
National Institutes of Health Clinical Center (CC)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–100
- RecruitingHealthy volunteers
Diabetes and Heart Disease Risk in Blacks
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–70
- RecruitingHealthy volunteers
Study of New Magnetic Resonance Imaging Methods of the Brain
National Institute of Neurological Disorders and Stroke (NINDS)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–120
- RecruitingHealthy volunteersPhase 2
Study of Neuro-Cognitive Correlates of Pediatric Anxiety Disorders
National Institute of Mental Health (NIMH)
- Location
- Bethesda, MD + 1 other US site
- Eligibility basics
- Ages 8–65
- RecruitingHealthy volunteers
Collection of Serum and Tissue Samples From Patients With Biopsy-Proved or Suspected Malignant Disease
National Cancer Institute (NCI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 2+
- RecruitingHealthy volunteers
Cancer in Inherited Bone Marrow Failure Syndromes
National Cancer Institute (NCI)
- Location
- Bethesda, MD + 1 other US site
- Eligibility basics
- Ages 0 mo–100
- RecruitingHealthy volunteers
Genetic Analysis of Birt Hogg-Dube Syndrome and Characterization of Predisposition to Kidney Cancer
National Cancer Institute (NCI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 2+
- RecruitingHealthy volunteers
Collection of Blood From Patients With Cancer
National Cancer Institute (NCI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Collection of Data and Samples From Healthy Donors for Use in Translational Research
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–85
- RecruitingHealthy volunteers
Evaluation of Patients With Immune Function Abnormalities
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Evaluation of Biochemical Markers and Clinical Investigation of Niemann-Pick Disease, Type C
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 0 mo–120
- RecruitingHealthy volunteers
Development of Magnetic Resonance Imaging Techniques for Studying Mood and Anxiety Disorders
National Institute of Mental Health (NIMH)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Follow-Up Study of Subjects Previously Enrolled in Poxviral Vector Gene Transfer Studies
National Cancer Institute (NCI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Blood Sampling for Research Related to Sickle Cell Disease
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–100
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