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
- NCT06689956Recruiting
Observation after surgery for low-risk endometrial cancer with tiny lymph node findings
This study looks at women with low-risk endometrial cancer who had tiny amounts of cancer cells found in their sentinel lymph nodes during surgery. Doctors want to see if it's safe to avoid additional treatments like chemotherapy or radiation.
Rochester, MinnesotaAges Any age - NCT07762677Recruiting
CT scan using new technology to check head vein stents
This study tests a new type of CT scanner that gives clearer pictures of the stent in the vein in your head after it has been placed. The goal is to see if this new scanner helps doctors see the stent better and spot any problems more easily.
Beijing, Beijing MunicipalityAges 18–90 - NCT06890013Recruiting
Heart artery function test after a heart attack
This study looks at how well the blood vessels in your arm relax after a heart attack. It uses an ultrasound test on your arm, a heart ultrasound, and some blood tests to see if this can help predict future heart problems.
ThessalonikiAges 18–85 - NCT07487480Recruiting
Guselkumab for Crohn's after ustekinumab
This study looks at whether guselkumab, a different biologic medicine, can help people with Crohn's disease who have already tried ustekinumab but it didn't work well or caused side effects. It aims to see if switching to guselkumab is safe and effective.
Hangzhou, ZhejiangAges 18–75 - NCT06591442Enrolling by invitation
Spinal Fusion Recovery in Older Adults
This study is looking at how older adults recover after spinal fusion surgery, a type of back surgery that connects bones in the spine. The goal is to find factors that help people heal faster and feel better afterward.
Wuhan, HubeiAges 60 years+ - NCT07077304Recruiting
Cardiac imaging study for inflammatory heart diseases
This study uses heart scans (MRI or nuclear imaging) to better understand inflammatory heart conditions. If you have a suspected inflammatory heart disease and are already scheduled for one of these scans, you may be able to join.
ParisAges 18 years+ - NCT07233148Recruiting
ALS, MND, or PLS registry study
This observational study creates a registry for people with ALS, MND, or PLS. It helps researchers better understand these conditions and find possible treatments.
Park City, UtahAges 18–110 - NCT07314151Recruiting
TCM tools for inflammatory bowel disease
This study compares people with Crohn’s disease or ulcerative colitis to healthy volunteers to see if traditional Chinese medicine tools can help identify unique features of these conditions, like changes in tongue coating. It aims to improve how we diagnose and understand inflammatory bowel disease.
Taichung, NorthAges 18 years+ - NCT07877233Recruiting
Nutrition study for pregnancy after weight-loss surgery
This study looks at the nutrition of mothers who had weight-loss surgery before pregnancy and their babies. It aims to understand how the surgery affects health during pregnancy and after birth.
Ålesund, Møre og RomsdalAges 18–45 - NCT07878104Recruiting
Ketogenic diet for hard-to-control seizures in adults
This study looks at whether a special high-fat, low-carbohydrate diet can help reduce seizures in adults whose epilepsy has not improved with two or more medications. It is an observational study, meaning participants follow the diet as part of their regular care and the research team tracks their progress.
StockholmAges 18 years+ - NCT07602595Recruiting
Early-life health risks and chronic pain in teens and young adults
This study looks at how early health problems might affect pain that lasts a long time. If you had a muscle or joint surgery, or a rheumatic disease, before age 18, you might help us understand why some people get ongoing pain.
Cincinnati, OhioAges 14–26 - NCT06907160Recruiting
Genetic testing before lung cancer treatment
This study looks at how tumors respond to chemotherapy plus immunotherapy before surgery for non-small cell lung cancer. It uses genetic tests on the tumor and blood to personalize treatment and possibly improve outcomes.
SeoulAges 19 years+ - NCT07678723Recruiting
Pupil test to predict blood pressure drop during C-section
This study checks if a simple pupil light reflex test can predict a drop in blood pressure after spinal anesthesia during elective C-sections. If it works, doctors could better manage blood pressure and reduce dizziness or nausea.
DamiettaAges 18–45 - NCT07144137Recruiting
Observation study for geographic atrophy progression
This study observes how geographic atrophy (an advanced form of dry age-related macular degeneration) changes over a short period. If you have this condition in both eyes and meet certain vision and eye health criteria, you may be able to join this non-treatment study to help researchers learn more about the disease.
Mountain View, CaliforniaAges 55 years+ - NCT07875582Recruiting
Blood test for better pancreatic cancer diagnosis
This study looks for proteins in the blood that could help doctors tell the difference between pancreatic cancer and non-cancerous pancreatic conditions, such as chronic pancreatitis or benign cysts. By participating, you could help improve early and accurate diagnosis, which may lead to better outcomes for future patients.
IașiAges 18 years+ - NCT04504006Recruiting
Tracking surgery choices for lymph node spread in endometrial cancer
This is an observational study that follows people with endometrial cancer who have had surgery to check and remove pelvic (and sometimes paraaortic) lymph nodes. It looks at how different surgical approaches and any added treatment affect local control (keeping cancer from coming back in the pelvis/nearby areas).
Essen, North Rhine-WestphaliaAges 18 years+ - NCT02073500Recruiting
Study of treatments and models for cancer in the belly lining
This study looks at how cancers that spread along the belly lining (“peritoneal surface malignancies”) behave and how different treatment strategies may work. It may help improve how doctors select and test treatments for people who are candidates for CRS-HIPEC, a specific cancer surgery approach.
OsloAges 18 years+ - NCT02640911Recruiting
Long-term study of certain antipsychines in schizophrenia
This is an observational (non-intervention) study that follows adults with schizophrenia who are taking specific “atypical” antipsychotic medicines long-term. Researchers want to learn about patients’ experiences and outcomes while on these treatments.
Shanghai, Shanghai MunicipalityAges 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 - 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+ - NCT05357456Recruiting
Study of brain and memory changes in cortisol-producing adrenal conditions
This study tracks thinking and brain changes over time in people with adrenal findings that produce too much cortisol (a stress hormone) on their own. It may help doctors understand how different treatments or watchful waiting affect the brain and cognition.
Nanjing, JiangsuAges 20–65 - NCT04746066Recruiting
Study of thalassemia, sickle cell, and inherited anemia with COVID
This observational study looks at people with thalassemia, sickle cell disease, or other inherited anemia who have COVID-19. It aims to learn how COVID affects these conditions and may help improve care planning.
GenovaAges Any age - NCT04667026Recruiting
Study of people living with HIV on treatment
This is an observational study that follows people with HIV who are taking HIV medicines (antiretroviral therapy). It may help researchers understand how treatment is going and what factors relate to doing well on therapy.
Guangzhou, GuangdongAges 14 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+
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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.