Clinical trials
Observational Study clinical trials
Below are recruiting observational study clinical trials, each written for real people, not researchers. We’re tracking 824 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT05809986Recruiting
Study of ofatumumab in adults with relapsing multiple sclerosis
This is an observational study (no random treatment) that follows adults with relapsing multiple sclerosis (RMS) who are taking ofatumumab. The study aims to better understand how patients do in real-world care while completing questionnaires and other scheduled check-ins.
AmadoraAges 18–99 - NCT05779475Enrolling by invitation
Study of people with moderate Parkinson’s disease
This is an observational study, meaning it doesn’t test a new drug—researchers mainly follow people to better understand moderate Parkinson’s disease and who may be good candidates for future cell therapy. If you have moderate symptoms that aren’t well controlled with tablets, this study may help inform better future treatments.
Irvine, CaliforniaAges 50–68 - NCT04151342Recruiting
Study of Canadian adults with cancer rare DNA changes
This real-world study follows adults in Canada who have cancer that was tested and found to have rare molecular (DNA/protein) changes. It helps researchers understand how these rare findings show up and how care happens in everyday practice.
Calgary, AlbertaAges 18 years+ - NCT05724121Recruiting
Study heart rhythm changes during BTK or venetoclax treatment
This observational study tracks how your heart rhythm (heartbeat pattern) changes while you take a BTK inhibitor or venetoclax. It may help doctors better understand heart rhythm risks in people receiving these cancer-related medicines.
Bethesda, MarylandAges 18–110 - NCT05719259Recruiting
Study on pneumonia from breathing machines in the ICU
This study watches patients in the intensive care unit (ICU) who are on a breathing machine (ventilator) to learn more about pneumonia that can happen from the machine. The goal is to understand how to better prevent and treat this infection.
TiranaAges 18 years+ - NCT05686278Recruiting
Study of long-term outcomes after hip hemiarthroplasty
This is an observational study that follows people over time after hip hemiarthroplasty (a partial hip replacement). It aims to understand how well Corin hip devices work long-term in everyday care, and what outcomes to expect.
Amboise, FranceAges 18 years+ - NCT05657405Recruiting
Study of data analytics for people with genetic conditions
This is an observational study that collects health and family history information to see how advanced data analysis can help people with genetic conditions. It may involve website forms, optional conversations, and sometimes an NIH visit, depending on your situation.
Bethesda, MarylandAges 1 day–120 years - NCT05640102Recruiting
Study of zanubrutinib in Waldenström macroglobulinemia
This is an observational study that follows people with Waldenström macroglobulinemia (WM) to learn how well zanubrutinib works and how safe it is. Your results will be tracked in relation to your disease features, including a blood/marrow marker called MYD88.
Huntsville, AlabamaAges 18 years+ - NCT05668338Recruiting
Hearing-device registry study for MED-EL users
This is an observational study that collects information from people using MED-EL hearing devices (with or without an implant) to better understand real-world hearing care. It may help improve future planning, support, and device use for patients like you.
BochumAges Any age - NCT05643014Recruiting
Study of chemical exposure in firefighters’ urine
This observational study looks at how common environmental chemicals may build up in firefighters, measured with urine samples before and after exposure. It may help researchers understand potential health risks in this job—even though you won’t receive study medicine.
Minneapolis, MinnesotaAges 18 years+ - NCT05650619Recruiting
Study of return of kidney disease after transplant
This observational study looks at people with FSGS or minimal change disease whose kidney disease came back after a transplant. The goal is to better understand patterns of recurrence and what factors may be linked to it.
Ann Arbor, MichiganAges Any age - NCT05654883Enrolling by invitation
Study of mpox immunity in people who were vaccinated or infected
This observational study looks at how your body’s defenses work against mpox (monkeypox), based on blood and health information. You may be eligible if you recently got an mpox vaccine or have had mpox infection and are now out of isolation.
New York, New YorkAges 18–100 - NCT05590949Recruiting
Bone health study for breast cancer survivors off bone medication
This study looks at bone complications in women who have finished treatment with denosumab (a bone-strengthening drug) and aromatase inhibitors (hormone therapy for breast cancer). It aims to learn more about what happens to bones after stopping these medications, which may help guide future care.
Basking Ridge, New JerseyAges 18 years+ - NCT05590715Recruiting
Study of autism details using health records
This observational study looks at different groups of people with autism spectrum disorder (ASD) using existing medical records and caregiver reports. It may help researchers better understand what different autistic subgroups need, without giving an experimental treatment.
Phoenix, ArizonaAges 12–65 - NCT05557695Recruiting
Acalabrutinib patient study for early access CLL in the UK
This observational study follows adults in the UK who started acalabrutinib through an early access program for chronic lymphocytic leukemia (CLL). It aims to learn what happens in real-world care after starting the medicine.
AylesburyAges 18–130 - NCT05541016RecruitingPhase 2
Personalized lower-dose radiation for HPV-related throat cancer
This Phase 2 study tests whether giving a less intense (de-escalated) radiation plan can work for certain people with HPV-related oropharyngeal throat cancer. It uses HPV blood testing and scans to help guide treatment, aiming to keep cancer control while reducing treatment side effects.
Scottsdale, ArizonaAges 18 years+ - NCT05504681Recruiting
Using brain test markers in a cancer clinic visit
This study adds special brain “biomarker” tests into routine visits for adults with brain tumors. It may help the clinic better track these cancers over time and tailor care.
Miami, FloridaAges 18 years+ - NCT05539079Recruiting
Long-term study of MGUS and how it may change over time
This study follows people with MGUS (a blood condition that usually does not cause symptoms right away) to learn how it progresses over the long term. If you have MGUS or might have it, your results may help doctors understand risk and changes over time.
Oxford, OxfordshireAges 18 years+ - NCT05528744Recruiting
Study genes and symptoms in ANKRD17-related CAGS
This study looks at how a specific gene change in ANKRD17 relates to the symptoms, brain/scan findings, and brain-cells in people with Chopra-Amiel-Gordon syndrome (CAGS). It may help families understand the condition better and connect gene results to what is seen clinically.
Boston, MassachusettsAges Any age - NCT05158894Recruiting
Pregnancy safety registry for migraine medicines Ubrelvy and Qulipta
This is an observational study (no treatment is assigned) that tracks side effects and pregnancy outcomes in people taking Ubrelvy or Qulipta for migraine during pregnancy. It may help doctors better understand how these medicines affect mothers and babies.
Durham, North CarolinaAges 18 years+ - NCT05477004Enrolling by invitation
Study of ketamine infusions for ongoing chronic pain
This study is observing people with chronic pain who are getting ketamine infusions at Stanford. You may help by completing email surveys about how you feel, which can help the team understand the treatment’s impact.
Stanford, CaliforniaAges 18 years+ - NCT05259605Recruiting
Study uses brain tumor tissue and scans to track treatment outcomes
This is an observational study that collects and compares information from patients with primary brain tumors and their treatment results. It uses stored tumor tissue and brain scans to better understand outcomes using updated tumor classification methods.
InnsbruckAges 18 years+ - NCT05363319Recruiting
Cemiplimab study in adults with advanced lung cancer
This observational study looks at how well cemiplimab works and how safe it is for adults with advanced non-small cell lung cancer in everyday care in Europe. It mainly follows patients already prescribed cemiplimab, and asks them to complete questionnaires.
Klagenfurt, CarinthiaAges 18 years+ - NCT05372172Recruiting
Tennessee Alzheimer’s study for people 60 and older
This study is looking at how brain and memory changes show up in people across the Alzheimer’s spectrum—from normal thinking to mild memory problems to Alzheimer’s disease. You might join if you can do study visits and an MRI and have a reliable study partner available.
Nashville, TennesseeAges 60 years+
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Common questions
- Are there clinical trials for observational study?
- Yes. Clin2 currently lists 824 recruiting observational study 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 observational study 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 observational study 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.