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
- NCT07486518Recruiting
Stomach precancer study with advanced endoscopy
This study uses high-definition endoscopy to look at early changes in the stomach lining that might lead to cancer. It aims to better understand these changes in people having a routine upper endoscopy for stomach-related symptoms.
Hyderabad, TelanganaAges 40 years+ - NCT07421895Recruiting
Study on retained tissue after pregnancy
This study follows patients with retained products of conception (tissue left in the uterus after a pregnancy) to see how they are managed in real-world medical practice. You may join if an ultrasound shows a tissue area of at least half a centimeter.
Changsha, HunanAges 18–45 - NCT06822634Recruiting
Advanced imaging for rectal cancer treatment response
This trial uses advanced MRI scans to see how well rectal cancer is responding to radiotherapy. It may help doctors better understand which treatments work best for patients with more advanced disease.
GlasgowAges 18 years+ - NCT07399808Recruiting
CDK4/6 Inhibitors in Older Breast Cancer Patients
This study looks at how well CDK4/6 inhibitors work in older adults with breast cancer who are taking these drugs after surgery to help prevent the cancer from coming back. It will follow patients over time to learn more about their experiences.
Pavia, PaviaAges 18 years+ - NCT07388628Recruiting
Observing ARTICE® treatment in the ICU
This study is collecting real-world data on ARTICE® treatment for adults in the ICU. It helps doctors understand how this treatment works in daily practice.
MagdeburgAges 18 years+ - NCT07359183Recruiting
Long-term follow-up of kids who had oral immunotherapy for allergies
This study checks on children and young people 5 to 15 years after they finished an 18-month oral immunotherapy treatment for peanut, egg, or milk allergy. It helps researchers understand how their allergies and health are doing over the long term.
Parkville, VictoriaAges Any age - NCT07211321Recruiting
Diet, inflammation, and muscle loss in older adults
This study looks at how diet and gut health relate to muscle loss (sarcopenia) in adults 60 and older. It aims to understand links between inflammation, gut bacteria, and muscle strength so we can find better ways to prevent frailty.
Lanzhou, GansuAges 60 years+ - NCT07001267Recruiting
Comparing two anesthetics for stroke procedure recovery
This trial tests whether a sedative given through an IV or a gas you breathe affects recovery after surgery to remove a blood clot in the brain. It may help find the best way to keep you comfortable during the procedure to improve how well you do after three months.
Kansas City, KansasAges 18 years+ - NCT06926244Recruiting
Studying resistance to IgA nephropathy treatments in real life
This study observes how people with IgA nephropathy respond to standard and newer treatments in everyday medical practice, to understand why some cases are resistant to therapy.
ParisAges 18 years+ - NCT06889844Recruiting
Blood test for colorectal cancer cross-reactivity study
This research study uses a blood test to look for signs of colorectal cancer in people who have other types of cancer or digestive diseases. The goal is to see if the test can correctly tell the difference between colorectal cancer and other conditions.
Málaga, AndalusiaAges 18 years+ - NCT06713525Recruiting
Observational study of pancreatic cancer in Copenhagen
This study is observing people with pancreatic cancer in Copenhagen to learn more about the disease. It is open to anyone with a confirmed diagnosis.
HerlevAges Any age - NCT06577779RecruitingPhase 4
Testing Jornay PM for adult ADHD symptoms into the evening
This study tests if Jornay PM, a long-acting ADHD medication, helps control symptoms, focus, and emotions throughout the day and into the early evening in adults with ADHD. It is an open-label study, meaning everyone knows they are getting the medication, and then they are randomly assigned to different observation groups.
New York, New YorkAges 18–60 - NCT05678530Recruiting
Testing a new way to measure fitness during heart tests
This study is testing a new method to estimate your fitness level from the results of standard heart tests you may already be getting. It aims to provide useful information to help your care team understand your heart and lung health better.
Scottsdale, ArizonaAges 18 years+ - NCT04750798Recruiting
Monitoring approved catheter devices during heart rhythm ablation
This study is observing people with common abnormal heart rhythms who are already scheduled for a catheter ablation using an approved Biosense Webster catheter. It aims to better understand real-world use and outcomes, without testing a new drug.
GrazAges Any age - NCT04534413Enrolling by invitation
Test lung cancer samples outside the body during surgery
This study looks at lung cancer tissue after surgery, using lab testing done outside the body. It may help researchers better observe and study lung tumors using samples taken during lobectomy or segment removal.
Toronto, OntarioAges 18 years+ - NCT01719055Recruiting
Long-term follow-up for Boston Scientific pain nerve stimulation
This study looks at how well a Boston Scientific nerve stimulation device works over the long term for pain in everyday care. You may be able to join if you’re already being set up to use one of these approved systems and can reliably report your pain outcomes.
Phoenix, ArizonaAges 18 years+ - NCT06965335Recruiting
Early-onset colorectal cancer study
This study looks at colorectal cancer that starts early in life (ages 18–40). It compares it to the same cancer in people over 60 to find differences. You can join if you have had colorectal cancer and can provide a sample of your tumor.
Milan, MilanoAges 18–40 - NCT07048561Recruiting
Fitness and thinking skills in older adults
This study looks at how physical fitness connects to thinking skills like planning and memory in older adults. If you join, you will complete fitness tests and thinking tasks to help researchers understand this link.
TaipeiAges 65 years+ - NCT06870981Recruiting
Optimizing nutrition and milk in infants (Opti-NuM)
This study looks at stored information and samples from babies who were part of earlier MaxiMoM nutrition trials. It aims to learn more about how nutrition and milk feeding affect infant health.
Palo Alto, CaliforniaAges 1 hour–3 weeks - NCT05853796Recruiting
Studying stroke warning signs in young adults
This observational study follows people ages 18–50 who had a first TIA (“mini-stroke”) or an acute ischemic stroke to better understand what happens after the event. It may help improve future care by tracking symptoms, imaging findings, and recovery over time.
Nijmegen, GelderlandAges 18–50 - NCT06607471Recruiting
Study on non-ischemic heart muscle diseases
This study looks at different types of heart muscle diseases that are not caused by blocked arteries (non-ischemic cardiomyopathies). It aims to better understand how to diagnose, predict outcomes, and treat these conditions by gathering information from many patients over time.
Milan, MilanoAges 18 years+ - NCT07398222Recruiting
Stomach contents in tirzepatide users and fasting volunteers
This study uses an ultrasound to look at the stomach contents of people who are taking tirzepatide compared to those who are not. It will help doctors understand how this medication affects stomach emptying during fasting.
São Paulo, São PauloAges 18 years+ - NCT07358078Recruiting
Long-term study of ATTR-CM patients on vutrisiran or other approved therapies
This study observes people with ATTR-CM (a heart condition caused by a protein called transthyretin) who are starting treatment with vutrisiran or another approved therapy. It aims to understand how the disease progresses and how treatments work in real life.
Tucson, ArizonaAges 18 years+ - NCT07356544Recruiting
HER2 mutations in advanced non-small cell lung cancer
This study is looking at how common HER2 gene changes are in people with advanced non-small cell lung cancer (NSCLC) and how these changes affect treatment. By joining, you help researchers learn more about personalized care for this type of lung cancer.
Bari, BAAges 18 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.