Healthy volunteers wanted: your samples could unlock disease mysteries
NCT ID NCT00090662
First seen Jun 24, 2026 · Last updated Sep 17, 2026 · Updated 9 times
Summary
This study collects blood, urine, stool, and other samples from up to 150 healthy volunteers aged 18 to 85. Researchers will use these samples to compare with samples from patients who have too many eosinophils (a type of white blood cell), which can cause disease. The goal is to better understand these conditions, not to test a treatment. Volunteers are paid for their participation.
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
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About 250 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Dec 2004
- Lead sponsor
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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
Healthy volunteers.
- Ages
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18 to 85 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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.
* Eligibility criteria for volunteer whole blood donation are based on the Standards of the AABB and the Code of Federal Regulation 21 CFR 640. Specific criteria follow: INCLUSION CRITERIA (blood, urine, stool, infrared thermograpy, photography, gastrointestinal secretion, pulmonary function testing and/or sputum donation) * ability to sign informed consent * healthy male or female * 18-85 years of age EXCLUSION CRITERIA (blood, urine, stool, infrared thermograpy, photography, gastrointestinal secretion, pulmonary function testing and/or sputum donation) * pregnancy * weight \<110 pounds * history of heart, lung, kidney disease, chronic anemia or bleeding disorders Eligibility for tissue biopsy donation (other than skin) will be determined by the protocol under which the procedure is performed and the physician performing the procedure. Eligibility criteria for volunteer bone marrow, skin and cerebrospinal fluid donation are more stringent than those for other specimen donations to minimize risk of procedure complications and maximize utility of specimens for study: INCLUSION CRITERIA (bone marrow, cerebrospinal fluid and/or skin donation) * ability to sign informed consent * healthy male or female * 18-65 years of age * willingness to provide concurrent blood sample EXCLUSION CRITERIA (bone marrow, cerebrospinal fluid and/or skin donation) * a known bleeding disorder, low platelets (\<100k) or taking medications that interfere with blood clotting, such as aspirin, non-steroidal anti-inflammatory agents or warfarin * anemia (hemoglobin less than 12.3 mg/dL) * evidence of an immune deficiency, such as HIV infection or cancer * pregnancy * taking a medication that affects the immune response within the past month, including oral, intravenous, or injectable steroids * allergic to xylocaine * have taken an investigational drug in the last 6 months * any other medical condition that the investigator feels puts the participant at too high a risk for participation * warfarin and/or heparin treatment will not be stopped so that a subject can participate in this protocol. If warfarin or heparin was recently discontinued, a subject can be enrolled, but no bone marrow procedures will be performed until the PT is \< 15.5 seconds and the PTT is within normal range. For other agents that interfere with blood clotting without prolonging the PT, a 7-day washout period will be required before bone marrow sampling, skin biopsy or lumbar puncture. Additional exclusion criteria (cerebrospinal fluid) -Previous diagnosis of central nervous system pathology (including tumors, inflammatory conditions, infection, seizure disorder, spina bifida) * History of spinal surgery with hardware placement * History of any spinal surgery or injections of the lumbosacral spine * Headache on the day of donation Additional exclusion criteria (skin biopsy) -History of keloid or abnormal scar formation
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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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
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National Institutes of Health Clinical Center
RECRUITINGBethesda, Maryland, 20892, United States
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