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
- NCT06431347Recruiting
Study on social factors in transplant care
This study looks at how social and financial challenges affect people getting a transplant or cell therapy at MD Anderson. Researchers want to talk to patients and their caregivers to better understand these challenges and improve care.
Houston, TexasAges 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+ - NCT06192563Recruiting
Dupilumab for severe eczema with limited skin rash
This study looks at how well dupilumab works for children and teens with severe eczema (atopic dermatitis) even when the rash is not widespread. It aims to see if the treatment helps with itching, quality of life, and rashes in visible or sensitive areas.
BolognaAges 6 months–17 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.
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+ - 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 - 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+ - 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+ - NCT05820776Recruiting
Tele-rehabilitation for stable breathing problems
This observational study looks at how tele-rehabilitation affects people with stable chronic breathing problems, especially if breathing limits their activity. It may help your care team understand what kinds of support work best when symptoms are steady.
Toronto, OntarioAges 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+ - 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+ - 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 - NCT04049084Enrolling by invitation
Follow-up study for people treated with gene therapy for ADA-SCID
This is a follow-up (no new treatment) study for people who previously received a gene therapy made from their own cells for ADA-SCID. It mainly tracks long-term safety and whether a marker showing the gene change can still be found.
Los Angeles, CaliforniaAges Any age - NCT02936791Recruiting
Study of early inherited kidney cysts and healthy volunteers
This observational study follows people early in autosomal dominant polycystic kidney disease (ADPKD) and also some healthy volunteers to learn how the kidneys work over time. It may help researchers understand early changes, which could guide future treatments.
Chicago, IllinoisAges 4–35 - NCT04682470Recruiting
Research study following young adults with cancer
This is an observational study that follows young adults with a confirmed cancer diagnosis to learn more about their experience and care. It does not test a new drug, but your information may help improve future cancer treatment and support.
Amsterdam, North HollandAges 18–39 - NCT07165717Recruiting
Real-world study of breathing emergencies in ICU patients
This study looks at why some patients develop severe breathing problems in the ICU. It focuses on people who already have conditions like severe infections, injuries, or heavy bleeding that can stress the lungs.
Shanghai, Shanghai MunicipalityAges 18 years+ - NCT02784977Recruiting
Sleep apnea study using a national sleep database
This study collects information from adults who are getting a sleep test because obstructive sleep apnea is suspected. It helps researchers better understand sleep apnea and who develops it, without giving a new treatment.
IstanbulAges 18–80 - NCT06162234Recruiting
High Myopia Study in Wuhan
This study looks at how high myopia (severe nearsightedness) affects the eye over time. It aims to better understand the condition and improve care for people with high myopia.
Wuhan, HubeiAges 18–65 - NCT05784038Recruiting
Study of monkeypox infection in Brazil
This is an observational study that follows people with confirmed monkeypox (mpox) to better understand the illness over time. It may help doctors learn what to expect and improve care, but it does not test a new treatment.
Belém, ParáAges 18 years+ - NCT07800754Recruiting
Stomach and esophageal cancer care in Greece
This study is for people with stomach or esophageal cancer in Greece. It is not a treatment study; it simply looks at how patients are diagnosed and treated in regular practice, so participating won't change your care.
AlexandroupoliAges 18–130 - NCT05812248Recruiting
Tracking heart and blood vessel events after major non-heart surgery
This study follows people after major surgery to see what predicts heart and blood vessel problems later. It does not test a new drug; it mainly collects health information to help clinicians reduce risk.
Guangzhou, GuangdongAges 45 years+ - NCT05960370Recruiting
Testing a tighter embryo placement technique in natural frozen transfers
This study looks at whether “endometrial compaction” (a technique used during frozen embryo transfer) improves pregnancy and baby outcomes. It focuses on people having a frozen transfer using embryos that test normal on genetic screening.
MadridAges 18–50 - NCT07702357Enrolling by invitation
Preschool outcomes study for ReDiMOM children
This study follows up on children who were part of the ReDiMOM study to see how they are doing in preschool. It helps researchers understand the long-term effects of the earlier study.
Chicago, IllinoisAges 2–6
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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.