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
- NCT05334940Recruiting
Care program for children and teens with multiple allergies
This trial is for people with moderate to severe allergic diseases who are about to start a biologic medicine (a targeted allergy treatment). It also looks at people who have more than one allergy condition, aiming to improve coordinated care across allergy problems.
BerlinAges 6 years+ - NCT05213572Recruiting
Study of organ health in adults with sickle cell
This observational study looks closely at how major organs (like brain, kidneys, heart, lungs, liver, and joints) are working in adults with sickle cell. It may help researchers understand what changes happen after curative treatments (like transplant or gene therapy) or with ongoing care.
Bethesda, MarylandAges 18–100 - NCT04728542Recruiting
Observational study comparing two osteoporosis treatment approaches
This is an observational study, meaning researchers watch what happens in real life rather than assigning a treatment by chance. It compares outcomes between people using ORIGIN® and VANGUARD® PS, to better understand how these approaches perform.
MainzAges 18 years+ - NCT04886401Recruiting
Study predicting response to pembrolizumab in advanced lung cancer
This study looks back at prior treatment to learn which patients with advanced non-small cell lung cancer (NSCLC) are more likely to respond to pembrolizumab, an immune therapy given up front. The results may help doctors better predict who benefits from this treatment.
BrestAges Any age - NCT05069441Recruiting
Predicting breathing trouble after removing a breathing tube
This study looks at patients who are ready to have their breathing tube removed and checks how to predict who might struggle after extubation. It’s observational, meaning your care won’t be changed—researchers are gathering information to improve future predictions.
ChongqingAges 18 years+ - NCT04786977Recruiting
Measuring a nerve-related eye signal in children on vincristine
This study checks how children’s pupil responses look while they are receiving vincristine (a cancer medicine). The goal is to learn whether a simple eye measurement can reflect how the body is responding to treatment.
Washington D.C., District of ColumbiaAges 6–18 - NCT05195697Recruiting
Study of outcomes for adults needing urgent surgery
This study looks at what factors affect outcomes for adults admitted for urgent (acute) surgical care at Skåne University Hospital. It may help the hospital improve care and understand which patients are at higher or lower risk.
Malmö, Skåne CountyAges 18 years+ - NCT04027777Recruiting
Study of a wearable blood pressure device in adults
This observational study tests how well a wearable device (the Aktiia bracelet) measures blood pressure by comparing it to standard listening checks. It may help people understand how accurate home-style blood pressure readings can be in different health situations.
LausanneAges 21–85 - NCT06169956Recruiting
Study of nivolumab with chemo before lung cancer surgery
This study looks at how well the immunotherapy drug nivolumab (Opdivo) works when given with standard chemotherapy before surgery for people with a certain type of lung cancer that has not spread. It may help shrink the tumor before surgery.
Kempten (Allgäu), BavariaAges 18 years+ - NCT06461351Recruiting
Long-term study of patients treated with Inaticabtagene Autoleucel
This study is a long-term follow-up for people who have already received Inaticabtagene Autoleucel, a type of cell therapy. It checks how patients are doing over time, and does not involve any new treatments.
Tianjin, Tianjin MunicipalityAges 18 years+ - NCT06486779Recruiting
Study of Kesimpta in Greek MS Patients
This study watches how well Kesimpta (ofatumumab) works for people with relapsing multiple sclerosis over time. It collects information from routine doctor visits and scans to see if the treatment is controlling the disease.
Athens, AtticaAges 18–55 - NCT07147101Recruiting
Immunotherapy for advanced liver cancer: a study on effectiveness and immune response
This study looks at different first-line immunotherapy treatments for people with advanced liver cancer that cannot be treated with surgery or local therapies. It aims to understand how well these treatments work and how they affect the body's immune system.
Shanghai, Shanghai MunicipalityAges 18 years+ - NCT06282718Recruiting
Observational study of respiratory infections in primary care
This study tracks how patients with respiratory infections (like bronchitis, sore throats, or COVID-19) are treated in family doctor offices across Europe. The goal is to learn more about these infections and improve care. You may be able to join if you have a cough, sore throat, or other symptoms that suggest a respiratory infection, and you go to a participating clinic.
AntwerpAges Any age - NCT03024918Recruiting
Study of unequal blood sharing in identical twin pregnancies
This is an observational study in pregnancies with identical twins who share the same placenta. It looks at uneven sharing of blood flow and how often it happens in different twin complications—without changing your treatment.
LeuvenAges 18 years+ - NCT07506382Recruiting
Comparing two self-expanding aortic valves in TAVR
This study compares two types of self-expanding aortic valves used during a minimally invasive procedure called TAVR. It aims to see which type works better in everyday practice.
Montpellier, OccitanieAges 18 years+ - NCT06620471Recruiting
Better nerve blocks with impedance testing
This study looks at whether adding impedance testing to ultrasound guidance improves accuracy for arm and leg nerve blocks. If you need a nerve block for surgery, this may help us learn how to make them safer and more effective.
Beirut, BeirutAges 18–90 - NCT06680401Recruiting
EHE: An Observational Study for People With This Rare Tumor
This study is tracking people with a rare blood vessel tumor called epithelioid hemangioendothelioma (EHE) to learn more about how it behaves and how best to care for you. By joining, you'll help doctors improve future treatments for this condition.
MilanAges 18 years+ - NCT07300462Enrolling by invitationPhase 4
Oral cholera vaccine safety study for children
This trial is for children aged 2 to 14 who have not had a cholera vaccine before. It tests a safe, oral vaccine to prevent cholera, a serious diarrheal disease.
Hefei, AnhuiAges 2–14 - NCT06701890Recruiting
Traveler health study
This study follows travelers to learn about illnesses they might get abroad, like infections from mosquitoes or antibiotic-resistant germs. It uses a smartphone app to track your health before, during, and after your trip.
ParisAges 18 years+ - NCT07083999Recruiting
Fertility support for women 32 to 38 trying to conceive
This study looks at how the Ovosicare® Fertility supplement affects fertility in women between 32 and 38 years old who have been trying to get pregnant for at least six months. It's a way to see if this product can help improve your chances of conceiving.
Sitges, BarcelonaAges 32–38 - NCT07169708Recruiting
Study of nivolumab and chemo before surgery for lung cancer
This trial looks at real-world outcomes in Taiwan for people with resectable non-small cell lung cancer (NSCLC) who get nivolumab combined with chemotherapy before surgery. It aims to understand how well this treatment works and how safe it is.
Kaohsiung CityAges 18 years+ - NCT06021483Recruiting
Observing safety and effectiveness of Zepzelca for lung cancer
This study tracks how safe and effective the drug Zepzelca (a chemotherapy) is for people with advanced small cell lung cancer that has not responded to earlier platinum-based chemo. It allows patients to receive the drug as part of their normal care while researchers collect data.
SeoulAges 19 years+ - NCT06685380Recruiting
Cognitive Control During Sleep: Self-Awakening Study
This study looks at how our brains control waking up on purpose during sleep. It may help people who can train themselves to wake up at specific times.
Milan, ItalyAges 18–65 - NCT07081139Recruiting
Visual screening study for children with special needs
This study uses a video-based eye-tracking system to test how well children with special needs and typical preschoolers can see. It aims to find a friendly way to screen vision without asking children to read letters.
TaipeiAges birth–70 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.