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NCT Number: NCT07137429

Platelet Volunteers, Longitudinal and Multi-omic Study

Background:

Platelets are a type of blood cell that play a critical role in bleeding, forming blood clots, and healing. Researchers want to know more about platelets work in healthy people. They want to look at how platelets clump together, how blood clots, and how genes and proteins work. They also want to study how these processes change over time and how they are affected by factors such diet, exercise, weight, and new health problems.

Objective:

To study how platelets function in healthy people.

Eligibility:

Healthy people aged 18 years and older.

Design:

Researchers will review participants medical history. They will ask about the participant s family history and any drugs they take.

Participants will have a clinic visit once every 6 or 7 months for 10 years. Each visit will be 2 to 3 hours.

At each visit, participants will have several tests and procedures:

A physical exam, including vital signs. Hip and ankle circumference will be measured.

Urine collection.

Blood tests. About 10 tablespoons of blood will be drawn. Participants will be asked to fast for 10 hours and avoid drugs like aspirin or Advil for 7 days before each draw. Some of the blood may be used for gene studies. Some may be used to create stem cells for research. Stem cells are cells that can be used to make other types of cells.

Surveys and questionnaires. Participants will answer questions about habitual activity, diet, smoking, drugs and alcohol, sleep, illness, and other health issues. These surveys may be done online, via email, or by phone.

Recruiting

Interested in participating?

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Key information

Conditions

Thrombosis Cardiovascular Diseases Embolism and Thrombosis Vascular Diseases

Age range

18 year–100 year

Sex eligibility

All sexes

Study type

Observational

Primary location

About this study

Study Description:

This study will serve to provide tissue samples from healthy volunteers for mechanistic studies of platelet function.

Objectives:

Primary Objective: The goal is to obtain blood samples and corresponding derived information to optimize assays, understand variation in these assays due to different sources of variation, and conduct statistical association studies with appropriate designs including cross-sectional analysis, and longitudinal analyses. Environmental variables may include health reports, anthropometric variables, questions on habits and risk factors and medication during the study.

Endpoints:

Primary Endpoints: Establish and validate technical assays and equipment (e.g. platelet aggregation, hemostasis measurements, methylation, RNA-seq, proteomics and WGS, in vitro iPSC generation and bench compound and cellular imaging screening, etc.)

Establish normal physiologic mechanisms and platelet-related parameters in healthy participant samples and how these vary longitudinally and are influenced by variables (e.g., reproducibility, fluctuation with changing diet, exercise, weight and other risk factors or new disease onset)

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

  • INCLUSION CRITERIA:

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

  • Stated willingness to comply with all study procedures, including fasting at least 10 hours before each blood draw
  • Stated willingness to refrain from aspirin or non-steroidal anti-inflammatory drugs (NSAIDs) for 7 days prior to any visits
  • Age >= 18 years
  • In good general health as evidenced by self-reported medical history

Exclusion criteria

An individual who, by self-report, meets the following criteria will be excluded from participation in this study:

  • Current pregnancy or lactation
  • Active malignancies known, active known auto-immune disease, known major CVD (e.g., heart attack, stroke, venous thromboembolism, heart failure), severe bleeding history, on regular P2Y12 inhibitors or other antiplatelet treatments for a clinical reason, uncontrolled hypertension or diabetes

Treatment and study plan

Primary outcomes

  1. Establish and validate technical assays and equipment (e.g. platelet aggregation, hemostasis measurements, methylation, RNA-seq, proteomics and WGS, in vitro iPSC.

    Time frame: 10 years

    To provide a mechanism for collection of tissue samples from healthy volunteers for use in research studies relating to platelet biology.The goal is to obtain blood samples and corresponding derived information to optimize assays, understand variation in these assays due to different sources of variation, and conduct statistical association studies with appropriate designs including cross-sectional analysis, and longitudinal analyses. Environmental variables may include health reports, anthropometric variables, questions on habits and risk factors and medication during the study.

  2. Establish normal physiologic mechanisms and platelet-related parameters. How these vary longitudinally and are influenced by variables (e.g., reproducibility, fluctuation with changing diet, exercise, weight and other factors.

    Time frame: 10 years

    To provide a mechanism for collection of tissue samples from healthy volunteers for use in research studies relating to platelet biology.The goal is to obtain blood samples and corresponding derived information to optimize assays, understand variation in these assays due to different sources of variation, and conduct statistical association studies with appropriate designs including cross-sectional analysis, and longitudinal analyses. Environmental variables may include health reports, anthropometric variables, questions on habits and risk factors and medication during the study.

Study contacts

Contact information is provided by the study sponsor or research team.

Andrew D Johnson, Ph.D.

CONTACT

[email protected]

(508) 663-4082

Jayson J Grey, R.N.

CONTACT

[email protected]

(240) 401-6378

Sponsors and collaborators

Lead sponsor

National Heart, Lung, and Blood Institute (NHLBI)

Nih

Registry information

Important dates

Study start
2026
Primary completion
2041
Study completion
2041
First posted
Aug 22, 2025
Registry last updated
Apr 15, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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