Clinical trials
General Population (no Specific Condition or Disease) clinical trials
Below are recruiting general population (no specific condition or disease) clinical trials, each written for real people, not researchers. We’re tracking 10,742 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT04482660Enrolling by invitation
PET brain scan study of tau protein in ALFA volunteers
This study uses a special PET brain scan tracer to measure “tau” protein clumps in the brain. It’s meant to better understand brain changes in people who are already part of the ALFA research program, and may help researchers connect tau levels with memory and thinking.
Barcelona, BarcelonaAges 45 years+ - NCT04444362Enrolling by invitation
Probacine to protect organs after cardiovascular surgery
This study tests whether a medicine called Probacine can help protect your gut and organs after cardiovascular surgery. If you qualify, you may be asked to take part and follow the study plan to see if complications are reduced.
Beijing, Beijing MunicipalityAges 18–90 - NCT04432623Enrolling by invitationPhase 1/Phase 2
Test drug for adults with beta thalassemia intermedia
This trial studies an investigational medicine in adults with beta thalassemia intermedia (including non-transfusion dependent thalassemia). The goal is to see how well the treatment works and how safe it is for people whose hemoglobin runs in a certain range.
Oakland, CaliforniaAges 18 years+ - NCT04418830Enrolling by invitation
Study of a spine cage implant for degenerative back problems
This trial studies how well specific lumbar (lower back) implant “cages” help fuse vertebrae in people with degenerative disc disease, spinal slippage, narrowing, curvature, or forward-bending deformity. It may help by testing an approach to improve stability and reduce symptoms after surgery.
La Jolla, CaliforniaAges 18 years+ - NCT04417023Enrolling by invitation
Study for people with neuromuscular diseases
This study is for people (or their close family members) who have a neuromuscular disease, such as motor neuron disease, neuropathies, nerve-to-muscle signaling problems, or muscle diseases. It aims to better understand these conditions and how to move from lab findings to care for patients.
Ottawa, OntarioAges 18 years+ - NCT04364295Enrolling by invitation
Patients who used SeaSpine products join a global registry
This registry collects information from people who have been treated with at least one SeaSpine product and had standard imaging and symptom surveys before and after surgery. It helps doctors understand outcomes over time and can support future improvements in care.
Durango, ColoradoAges Any age - NCT04306380Enrolling by invitation
TIF patient registry for people treated at Indiana University
This study keeps information on people who already had a TIF procedure at Indiana University. It helps researchers learn from past treatments and may improve future care.
Indianapolis, IndianaAges 13 years+ - NCT04279496Enrolling by invitation
CT heart scan registry to track outcomes over time
This is a research registry that follows people who are already getting a CT scan of their heart arteries for medical reasons. It aims to better understand how these scans relate to future heart outcomes, while collecting follow-up health information.
Charlottesville, VirginiaAges 18 years+ - NCT04240665Enrolling by invitation
Test a digital notebook for memory problems
This study tests a digital “memory notebook” to help people who have early memory concerns keep track and report changes over time. It may be useful if you’re having mild memory issues and can complete surveys with a study partner.
Sacramento, CaliforniaAges 60 years+ - NCT04240119Enrolling by invitation
Study blood vessel growth markers in certain brain artery narrowing
This study looks at “angiogenic markers,” which are blood measures that may reflect how blood vessels grow, in people with significant narrowing of a brain artery. It aims to better understand these changes and how they relate to cerebrovascular disease.
Ages 18 years+ - NCT04204135Enrolling by invitation
Tracking hip flexor weakness after specific spine surgeries
This trial follows how hip flexor strength changes after two types of lower-back surgeries (ALIF or LLIF). It may help doctors better predict and prevent weakness in the hip and leg after surgery.
Chicago, IllinoisAges Up to 65 years - NCT04147559Enrolling by invitation
Long-term follow-up for a specific hip replacement stem
This study checks how well a particular hip replacement stem (the PROFEMUR Preserve Classic Femoral Stem) and matching parts keep working over many years. You may be invited if you had that exact hip replacement combination and can return for long-term checkups.
Scottsdale, ArizonaAges 21 years+ - NCT04141605Enrolling by invitation
Heart transplant candidates matched for better heart preservation
This study creates a worldwide registry and information database to help improve how donor hearts are preserved for transplant. If you are a heart transplant candidate, your details may be recorded to see what matching and preservation approaches work best.
Stanford, CaliforniaAges Any age - NCT04104659Enrolling by invitation
Tau PET scan study to map brain changes in Alzheimer’s
This study tests a PET scan “tracer” medicine called [18F]MK-6240 to see how tau protein changes show up in the brain. It may help researchers measure disease-related brain changes in people with normal thinking or mild dementia.
St Louis, MissouriAges 18 years+ - NCT04100486Enrolling by invitation
Testing a noninvasive device to measure your body signals
This study uses a noninvasive bioelectronic device to record your body’s automatic (involuntary) signals. The goal is to see how well the device can analyze these signals and how your body responds in a controlled setting.
Manhasset, New YorkAges 18–60 - NCT04066608Enrolling by invitation
Screening for advanced liver scarring in people with HIV
This study looks at how common advanced liver scarring (advanced fibrosis) is in people living with HIV. It may help doctors better understand liver risk in everyday care and guide future prevention.
MainzAges 18 years+ - NCT04065516Enrolling by invitation
Test for reflux treatment after POEM for achalasia
This study looks at a specific treatment (“ARAT”) to help people who develop acid reflux after a procedure called POEM for achalasia. It may help reduce reflux symptoms and abnormal acid levels in the stomach/esophagus after the original procedure.
Mexico City, Mexico CityAges 18 years+ - NCT04064008Enrolling by invitation
Long-term follow-up for a specific hip revision stem
This study follows people who had a hip replacement redone (revision) because of bone healing problems or hardware removal, using a specific revision femoral stem. It checks how the stem does over time and follows up for up to 10 years after surgery.
OtwockAges Any age - NCT04016181Enrolling by invitation
Study to categorize lung fibrosis types at a clinic
This study enrolls people who have interstitial lung disease and are seen at the Edinburgh lung fibrosis clinic. It aims to sort different underlying “types” of lung fibrosis so doctors can better understand and potentially guide care.
Ages 18–99 - NCT04008173Enrolling by invitation
Survey study of acute heart attack symptoms
This study collects information about symptoms and experiences during acute coronary syndromes, which are sudden, serious heart events like heart attacks or unstable angina. It may help researchers understand patterns of care and symptoms to improve future treatment and support.
Bologna, BolognaAges 18 years+ - NCT04003311Enrolling by invitation
Follow-up for specific shoulder implant types and surgery
This study checks outcomes in people who already received certain Zimmer Biomet shoulder implant components using the correct surgical technique. It may help improve how these specific implants are used and monitored after surgery.
Boise, IdahoAges 18 years+ - NCT04003272Enrolling by invitation
Reverse shoulder implant study for severely damaged rotator cuff
This trial studies a specialized reverse shoulder implant system for people whose rotator cuff is badly damaged or who had a prior shoulder replacement that failed. It aims to reduce pain and improve function by improving how your shoulder works, especially when the rotator cuff can’t do its job.
Louisville, KentuckyAges 18 years+ - NCT03976622Enrolling by invitation
Inflammation study in vitiligo and other skin conditions
This study looks at inflammation in people with vitiligo, psoriasis, atopic dermatitis, or alopecia areata. It aims to understand how these conditions compare, which may lead to better treatments.
Bordeaux, BordeauxAges 18–75 - NCT03853772Enrolling by invitation
Heartburn registry for long-term symptom and care follow-up
This registry enrolls people with GERD (chronic heartburn/reflux) to track symptoms and treatments over time for up to 5 years. It may help researchers understand what works best in everyday care, and you’ll be asked to complete check-in surveys.
Orange, CaliforniaAges 18 years+
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Common questions
- Are there clinical trials for general population (no specific condition or disease)?
- Yes. Clin2 currently lists 10,742 recruiting general population (no specific condition or disease) studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a general population (no specific condition or disease) trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a general population (no specific condition or disease) trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.