Clinical trials
Observational Study clinical trials
Below are recruiting observational study clinical trials, each written for real people, not researchers. We’re tracking 839 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT04588402Recruiting
Tests whether HPV vaccination prevents cervical HPV infection in young women
This study looks at whether HPV vaccination lowers the chance of getting HPV in the cervix. It will collect cervical samples and ask questions to see how vaccination affects infection in women in Sikkim, India.
Gangtok, SikkimAges 18–22 - NCT04701047Recruiting
Study of symptoms in vaginal prolapse patients
This is an observational study that follows women with vaginal prolapse to better understand symptoms and patient experiences. It may help improve future care, even though it does not test a new treatment.
GhentAges 18 years+ - NCT04766515Recruiting
Study of immune checkpoint cancer treatment in real life
This is an observational study that follows adults with solid cancer who are receiving immune checkpoint inhibitor treatments. It aims to learn how these medicines are used and what outcomes may look like in everyday care.
ShanghaiAges 18 years+ - NCT05188885Recruiting
Chronic kidney disease registry for real-world care
This study collects health information from people with chronic kidney disease (CKD) and also from some people without CKD but with kidney risk factors. It helps doctors understand how CKD develops and how it’s managed in everyday life, not to test a new drug.
Foshan, GuangdongAges 18 years+ - NCT05486650Recruiting
Study of focused radiation after PD-1 treatment helped non-lung cancer
This observational study looks at how stereotactic (high-precision) radiation works for advanced non-small cell lung cancer that is stable after PD-1 antibody treatment (sometimes with chemotherapy). It may help doctors better understand which patients benefit from this next treatment step and what side effects to expect.
Chongqing, Chongqing MunicipalityAges 18–75 - NCT05621746Recruiting
Tracking joint health after starting Esperoct in hemophilia A
This is a study that follows how people’s joints are doing after they start (or switch to) Esperoct, a preventive hemophilia medicine. It mainly collects real-world health information to understand joint outcomes over time.
Hamilton, OntarioAges 18 years+ - NCT05835518Recruiting
Study of Adalloce safety and effects in rheumatoid or ankylosing arthritis
This is an observational study that follows people with rheumatoid arthritis (RA) or ankylosing spondylitis (AS) who are planning to start Adalloce. It aims to understand how safe the medicine is and how well it works in real-world care.
DaeguAges 19–74 - NCT05835739Recruiting
Study of breast cancer prevention in BRCA1/2 mutation carriers
This is an observational study that looks at how different cancer prevention approaches affect women with harmful (deleterious) BRCA1 or BRCA2 mutations. It may help improve future prevention and follow-up plans for women at higher inherited risk.
Aviano, PordenoneAges 18 years+ - NCT05909761Recruiting
Pregnancy Uplizna safety study in women with NMOSD
This is an observational study that looks at the safety of Uplizna (satralizumab) during pregnancy for women who have neuromyelitis optica spectrum disorder (NMOSD). You may be asked to share information because your exposure to Uplizna happened during pregnancy or just before conception.
Aurora, ColoradoAges 15 years+ - NCT05942807Recruiting
Study of biliary tract cancer and care experiences
This is an observational study for adults with biliary tract cancer that looks at existing clinical information. It may help doctors understand the disease better and improve future care, without using a new treatment in a required way.
Roma, RomeAges 18 years+ - NCT06008691Recruiting
Study of newer antibodies for B-cell lymphoma in Italy
This study watches how newer monoclonal antibodies (targeted therapies) work for people with B-cell non-Hodgkin lymphoma in real-world Italian clinics. It helps doctors learn more about how these treatments affect patients in everyday care.
Viagrande, CataniaAges 18 years+ - NCT06008938Recruiting
Study tracking HEMGENIX for hemophilia B
This study watches how well HEMGENIX works and how safe it is for people with hemophilia B who are getting the treatment. It also compares data from adults on standard factor IX shots.
Rochester, New YorkAges 18 years+ - NCT06043609Recruiting
Outcomes after fertility preservation for patients at risk
This study checks how well fertility preservation methods work for patients who might lose their ability to have children due to illness or treatments like strong medicines or surgery. If you're interested in saving your fertility, this trial helps figure out how successful those options can be.
Hong KongAges Up to 60 years - NCT06069479Recruiting
Surgery vs. watching: study for kids with trigonocephaly
This study compares two approaches for children with trigonocephaly (a condition where the skull has a triangular shape): surgery or careful monitoring without surgery. The goal is to understand which approach leads to better clinical results, emotional well-being, and lower costs.
Rotterdam, ROTTERDAMAges Up to 8 years - NCT06073431Recruiting
Study on weight loss types in advanced cancer
This study looks at different types of weight loss (cachexia) in people with advanced lung, pancreatic, or colorectal cancer. Researchers want to find patterns to better understand and treat it. You can join even if you haven't lost weight yet.
Fort Smith, ArkansasAges 18 years+ - NCT06202027Recruiting
CRYSVITA safety and effectiveness in Korean patients
This study looks at the safety and effectiveness of CRYSVITA (burosumab) in real-world use among patients in South Korea. If you are already prescribed CRYSVITA for X-linked hypophosphatemia, your doctor may ask you to join this survey to help track how well it works and any side effects.
Wŏnju, Gangwon-doAges 1 day+ - NCT06272578Recruiting
Heart and kidney health study for chronic disease patients
This study checks how heart and kidney health are related in people with kidney disease, diabetes, high blood pressure, or high cholesterol. It is a single visit with tests to see if certain heart problems are common in these conditions.
Wedding, State of BerlinAges 18 years+ - NCT06414408RecruitingEarly Phase 1
Doxy-PEP study for STI prevention
This trial studies whether giving the antibiotic doxycycline right after sex (known as Doxy-PEP) can prevent STIs. It asks participants to provide hair, blood, and urine samples and follow specific guidelines about hair and condom use.
San Francisco, CaliforniaAges 18 years+ - NCT06459986Recruiting
How long does spinal anesthesia last? A study in orthopedic surgery
This study tracks how long spinal anesthesia lasts during planned orthopedic surgeries. By collecting real-world data, doctors hope to improve timing and care for patients having this type of anesthesia.
HillerødAges 18–100 - NCT06541652Recruiting
Study of rare liver cancers in France
This study looks at people with rare types of liver cancer to learn more about the disease. If you have one of these rare liver cancers, your information could help doctors understand these cancers better.
AmiensAges 18 years+ - NCT06595992Recruiting
Observing moderate aortic valve disease over time
This study follows people with moderate aortic valve disease to learn how their condition changes. It does not test a new treatment but will help doctors better understand the disease.
Hangzhou, ZhejiangAges 18 years+ - NCT06639165Recruiting
Radiation outcomes in children and young adults with pediatric cancers
This study looks back at past patients and follows new patients to understand how well radiation therapy works and what side effects it causes in children, teens, and young adults (and some older adults with childhood-type cancers) treated at the Pediatric Radiotherapy Unit in Aviano. It helps doctors learn more about the benefits and risks of radiation for these cancers.
Aviano, PordenoneAges Any age - NCT06729502Recruiting
Frailty Scale for Older Adults in the ICU
This study uses a simple picture-based scale to measure frailty in older adults (60+) who were admitted to the intensive care unit. It aims to better understand how frailty affects recovery in this setting.
Petah TikvaAges 60 years+ - NCT06769529Recruiting
Study of adults with congenital heart disease
This study follows adults born with a heart condition to see how they do over time, whether they had surgery or not. It aims to learn more about their health journey.
BolognaAges 18 years+
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Common questions
- Are there clinical trials for observational study?
- Yes. Clin2 currently lists 839 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.