Clinical trials
Observational Study clinical trials
Below are recruiting observational study clinical trials, each written for real people, not researchers. We’re tracking 843 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT05150249Recruiting
Study of older adults after hip fracture treated in hospitals
This is an observational study that follows people age 65 and older after a hip (femur) fracture to learn about their care and outcomes in participating hospitals. It won’t test a new treatment, but your participation may help improve future care for older patients.
BaggiovaraAges 65 years+ - NCT05153694Recruiting
Study of infections after bladder removal
This observational study follows people after surgery to remove the bladder to learn how often infections happen and what they look like. It may help doctors better prevent and manage complications after this operation.
Munich, Outside U.S./CanadaAges 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+ - NCT05200429Recruiting
Study of long-term effects of CFTR modulator medicines in CF
This observational study follows people with cystic fibrosis (CF) to understand the long-term impact of CFTR modulator medicines. It may help researchers see how these treatments work over time in real life.
Vancouver, British ColumbiaAges Any age - NCT05245695Recruiting
Endometriosis test using deep computer learning during surgery
This trial studies whether a computer (deep neural network) can better identify endometriosis in people with long-lasting pelvic pain using information from surgery. It may help doctors sort who has endometriosis more accurately when surgery is already planned.
Chandler, ArizonaAges 14–50 - 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+ - NCT05266092Recruiting
Study kidney disease immune system activity in dialysis patients
This study looks at how the body’s defense systems (immune system and related signals) behave in people with chronic kidney disease. It may help doctors understand what is driving inflammation and related complications in dialysis patients.
OdenseAges 18 years+ - NCT05266872Recruiting
Earlier diagnosis and better treatment study for Parkinson’s
This study is looking to improve how Parkinson’s and related brain conditions are identified and treated sooner. You may be asked to share your health information and provide blood or other samples, and possibly have procedures like a spinal fluid test or a small skin sample.
LuxembourgAges 18 years+ - NCT05285735Recruiting
Safety study for IV artesunate during pregnancy
This study follows people who were pregnant while receiving IV artesunate to better understand the treatment’s safety for both the mother and the baby. It does not test a new treatment—it collects safety information from real-world care.
Piscataway, New JerseyAges 15–100 - NCT05293184Recruiting
Angelman syndrome registry to track symptoms worldwide
This trial is building a global registry for people diagnosed with Angelman syndrome. It helps researchers learn more about how symptoms change over time, which can support future studies and treatments.
Brisbane, QueenslandAges Any age - NCT05332288Recruiting
Observing treatment outcomes for a knee cartilage defect
This observational study follows people with a specific knee cartilage injury from osteochondritis dissecans (OCD) to see how they do after standard care and rehab. It may help doctors understand which patients benefit most and what changes happen over follow-up.
BolognaAges 15–40 - NCT05335603Recruiting
Study of adults with liver conditions linked to fatty liver
This study looks at adults with different long-term liver conditions that are associated with fatty liver. It helps researchers better understand these diseases and factors linked to them.
HvidovreAges 18 years+ - NCT05344235Recruiting
Study of very short radiation schedules for prostate cancer
This observational study looks at how well men with localized prostate cancer do when treated with an unusually short radiation approach. It may help doctors understand which patients benefit most by tracking outcomes and imaging over time.
Leuven, Vlaams BrabantAges Any age - 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+ - NCT05416684Recruiting
PEEK vs titanium skull repair after brain surgery
This is an observation study that compares outcomes after two types of skull repair: PEEK and titanium. It may help doctors understand which option works best and how patients recover, without requiring an experimental treatment plan.
Shanghai, Shanghai MunicipalityAges 18–65 - NCT05501379Recruiting
Track activity in cancer patients during treatment
This study compares how physical activity answers on a questionnaire match what a motion tracker measures. It may help researchers understand activity levels in people with lymphoma, colorectal, or pancreatic cancer during treatment.
GreifswaldAges 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+ - NCT05521529Recruiting
Study of Cushing’s symptoms before and after treatment
This study looks at how Cushing’s syndrome affects people before treatment and what changes after treatment. It may help researchers understand what to expect and improve care for adults with newly diagnosed Cushing’s syndrome.
Aarhus, StateAges 18 years+ - NCT05522647Recruiting
Study of risk behaviors in hospitalized confused or agitated patients
This is a study that observes how often and what kinds of “risk behaviors” happen in neurosurgery patients who are agitated or confused. It aims to better understand these behaviors so care can be improved for people who are unable to move or who seem restless.
Clermont-FerrandAges 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 - 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+ - 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 - NCT05572710Recruiting
Aortic valve patients share real-world safety and outcomes
This observational registry collects information about people who need an aortic valve replacement using a biologic (bioprosthesis) valve. It aims to better understand safety and effectiveness in everyday care, not to test a new drug or procedure.
Leuven, Vlaams-BrabantAges 18 years+
Hear when a new Observational Study trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.
Common questions
- Are there clinical trials for observational study?
- Yes. Clin2 currently lists 843 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.