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
- NCT07272187Recruiting
Heat therapy for small pancreatic and adrenal tumors
This trial tests a new treatment that uses an endoscope (a thin, flexible tube with a camera) to deliver heat energy directly to certain small tumors in the pancreas or adrenal gland. It may be an option for people who cannot have surgery or whose tumors are growing slowly.
Herlev, Capital RegionAges 18 years+ - NCT04657367Recruiting
Diabetes and prediabetes health tracking registry study
This study is a registry that collects information from people with diabetes, prediabetes, or normal blood sugar to better understand these conditions over time. It may help researchers learn which factors are linked to health changes, including future diabetes risk.
Bialystok, Podlaskie VoivodeshipAges Any age - NCT07264959Recruiting
A study on indolent systemic mastocytosis treatments
This study is observing adults with indolent systemic mastocytosis (ISM) who are already receiving or planning to start symptom treatments or the drug avapritinib. It aims to learn more about how these treatments work in real life.
Aurora, ColoradoAges 18 years+ - NCT07260110Recruiting
Study of teplizumab vs. no treatment in stage 2 type 1 diabetes
This study watches people with stage 2 type 1 diabetes who either get teplizumab or not, to compare their real-world experiences. It helps researchers learn how the drug affects daily life.
San Francisco, CaliforniaAges 8 years+ - NCT07264998Recruiting
Gut bacteria study in breast cancer patients on Abemaciclib
This study looks at how gut bacteria changes in people taking Abemaciclib (a breast cancer drug) and whether that relates to diarrhea. It may help find ways to prevent or manage this side effect.
Wuhan, HubeiAges 18–75 - NCT02964637Recruiting
Tests to help diagnose frontotemporal dementia
This study looks at testing (including brain scans) to figure out what type of frontotemporal dementia or related language/speech condition a person has. It may help by making diagnoses more accurate, which can guide better care.
Toronto, OntarioAges 18–90 - 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 - NCT07254208Enrolling by invitation
Long-term study for those who took PBGENE-HBV
This study follows people who have already received the experimental gene therapy PBGENE-HBV for hepatitis B. It aims to monitor long-term safety and health outcomes.
Boston, MassachusettsAges 19–80 - NCT07255378Recruiting
Vasopressin for septic shock in the ICU
This study observes how the medication vasopressin works when added to standard treatment for septic shock in the ICU. It helps doctors understand if vasopressin improves outcomes for patients with severe infection and low blood pressure.
Terrassa, BARCELONAAges 18 years+ - NCT07253909Enrolling by invitation
Arm function in heart failure with ICD or CRT devices
This study looks at how well people with heart failure and certain heart devices (ICD or CRT) can use their arms and hands. It aims to understand if these devices affect upper body function.
Ankara, SamanpazarıAges 18 years+ - NCT07252427Recruiting
Gut bacteria in IBD with or without depression
This study looks at how the bacteria in your gut (gut microbiome) may differ between people with IBD who also have depression and those who don't. It aims to help understand the link between gut health and mood.
Jinan, ShandongAges 18 years+ - NCT07250100Recruiting
Study of gut bacteria in pancreatic cancer and precancer
This study looks at the bacteria living in your gut and pancreas to understand how they might affect pancreatic cancer and precancerous changes. It is for people who are already scheduled for an endoscopic procedure to look at or treat a pancreatic lesion.
Herlev, Capital RegionAges 18 years+ - NCT06525012Recruiting
Study on recovery after brain aneurysm bleeding in Martinique
This study looks at what happens to people who are hospitalized in Martinique after a brain aneurysm bursts. The goal is to understand recovery and outcomes better.
Fort-de-FranceAges 18 years+ - NCT07247344Recruiting
Depression in hospitalized teens: a brain study
This study looks at brain and behavior in teens aged 10–20 who are hospitalized for depression or bipolar disorder. It aims to better understand the condition and may help guide future treatments.
Nanjing, JiangsuAges 10–20 - NCT05858528Recruiting
Study following adults with skin psoriasis over time
This observational study is looking at adults with skin psoriasis and collecting real-world information about their condition and experiences. It may help researchers better understand psoriasis and how it affects people, without giving a new treatment.
Oxford, OxfordshireAges 18 years+ - NCT06212947Recruiting
An observational study for children with hypochondroplasia
This study observes children with hypochondroplasia to learn more about the condition. It does not involve any treatment—just monitoring and data collection to help future research.
Phoenix, ArizonaAges Up to 15 years - NCT07239843Enrolling by invitation
Study of blood markers and mental health in brain diseases
This study looks at how social factors and blood markers relate to psychiatric symptoms in people with brain diseases or mental disorders. It aims to find new ways to understand and diagnose these conditions.
Barcelona, BarcelonaAges 18 years+ - NCT07238049Enrolling by invitation
Real-world dementia outcomes: an observational study
This study follows people with memory or thinking problems over time to learn more about how these conditions progress. It's an observational study, meaning no new treatments are tested—just information is collected from your regular care.
BangorAges 45 years+ - NCT06908980Recruiting
Predicting survival after gallbladder removal for infected gallbladder
This study is testing a tool to predict survival after gallbladder removal for people with acute cholecystitis caused by gallstones. By joining, you help doctors better assess risk and improve care for future patients.
Pavia, PaviaAges 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+ - NCT07227441Recruiting
Chronic Infections and Inflammation in ME/CFS
This study looks at how chronic infections and inflammation affect people with ME/CFS (myalgic encephalomyelitis/chronic fatigue syndrome) compared to healthy people. Researchers want to understand what causes symptoms and find better ways to help.
San Francisco, CaliforniaAges 18 years+ - NCT07226570Recruiting
Ibogaine brain mapping study for opioid use disorder
This study uses MRI and EEG scans to map how ibogaine affects the brain in people with opioid use disorder. You must already be scheduled to receive ibogaine treatment in Tijuana, Mexico, on your own, as the study does not cover treatment costs.
Irvine, CaliforniaAges 21–70 - NCT07223372Recruiting
Study on male hormone blocking drugs for prostate cancer in Australia
This study looks at how certain drugs (darolutamide, enzalutamide, apalutamide, or abiraterone) that block male hormones are used to treat men with prostate cancer that has spread. It aims to understand real-world treatment patterns in Australia.
Pymble, New South WalesAges 18 years+ - NCT07224906Recruiting
Observing patients having a right heart catheterization
This study observes people who are already scheduled for a right heart catheterization, a procedure that checks the pressure in your heart. It helps doctors learn more about heart conditions without adding any extra treatments or procedures.
Boulder, ColoradoAges 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.