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
- NCT06066775Recruiting
Glucose, fats, and brain health in aging
This study looks at how blood sugar and fat levels relate to brain aging over time. It may help understand why some people's brains age faster than others.
Jinan, ShandongAges 50 years+ - NCT06514235Recruiting
Brachytherapy for vaginal cancer
This study is testing a special type of internal radiation (called image-guided brachytherapy) for women with vaginal cancer. It aims to give high doses directly to the tumor while limiting side effects to nearby organs.
Rotterdam, South HollandAges 18 years+ - NCT06517628Recruiting
Heart health in pregnancy: a study for moms and babies
This study follows pregnant women with heart conditions to understand how pregnancy affects their heart health and their baby's health. You may join if you have one or more heart conditions, such as a heart defect, a heart infection, an irregular heartbeat, or a blood vessel problem.
Kansas City, MissouriAges 18 years+ - NCT07054073Recruiting
HCMR Re-Imaging: MRI follow-up for HCM patients
This study uses MRI scans to re-examine people with hypertrophic cardiomyopathy (a thickening of the heart muscle) who were part of the original HCMR study. It compares different types of HCM to learn more over time.
Evanston, IllinoisAges 18–65 - NCT07075341Recruiting
Healthy living beyond weight study
This study tests whether a program focused on healthy eating and activity can help people manage their weight or maintain a healthy weight after treatment. It may be right for you if you are an adult concerned about your weight or health.
Dallas, TexasAges 18 years+ - NCT06704425Recruiting
How back pain affects thinking in older adults
This study looks at how chronic low back pain might affect memory, attention, and other thinking skills in adults aged 60 to 85. You will complete questionnaires, thinking tasks, and a brain scan to help researchers understand the link between pain and cognitive function.
Hong Kong, Hong KongAges 60–85 - NCT07676851Recruiting
Predicting dementia risk in older adults with depression
This study looks at whether certain health factors can predict the risk of dementia in older adults who have depression. Your medical records will be reviewed to help create a risk score.
Nanchang, JiangxiAges 50 years+ - NCT05257551Recruiting
Small cell lung cancer data study using tumor and blood samples
This observational study collects information and lab samples from people with extensive-stage small cell lung cancer. It may help researchers understand how patients respond and improve future care, but it usually does not add new treatment for you.
Los Alamitos, CaliforniaAges 18 years+ - NCT05770817Recruiting
Study of walking and heart changes in children and teens
This study looks at how children and teens’ heart rates and breathing respond during walking or light exercise. It may help researchers better understand who can safely take part in activity-based health programs.
Charlotte, North CarolinaAges 6–20 - NCT05890092Recruiting
Study of vulvar diseases in Nigeria
This is an observational study that looks at vulvar conditions in people assigned female at birth in Nigeria. It does not test a new treatment—researchers mainly want to learn about different vulvar diseases and who gets them.
LondonAges 10–90 - NCT05497518Recruiting
KidneyCARE study for adults with chronic kidney disease
This study is for adults with chronic kidney disease (CKD), including people on dialysis or with a kidney transplant. It aims to better support kidney care by allowing more community access to research.
Danville, PennsylvaniaAges 18–120 - NCT07646834Recruiting
Brain-Gut Study of IBS with Anxiety and Depression
This study explores how stress and mood changes affect irritable bowel syndrome (IBS) using brain imaging. Researchers will scan your brain and collect health information to understand the connection between your gut and mental health.
Xi'an, ShaanxiAges 18–60 - NCT07726875Enrolling by invitation
Orexin and confusion after surgery in older adults
This study looks at a brain chemical called orexin (which helps control wakefulness) in older adults after surgery. The goal is to see if orexin levels are linked to confusion or agitation that can happen when waking up from anesthesia. If you take part, your blood will be tested before and after surgery.
Shanghai, Shanghai MunicipalityAges 60 years+ - NCT05153057Recruiting
Follow-up study for birdshot eye inflammation
This study follows people with “birdshot chorioretinopathy,” a rare eye inflammation, and collects immune (genetic) information to better understand the disease. You may benefit from closer monitoring, and the results may help guide future treatments.
Paris, Île-de-France RegionAges 18 years+ - NCT07383883Recruiting
Asthma Study Using Tongue and Pulse Patterns
This study uses tongue and pulse information to better understand asthma in children. It may help doctors personalize treatment and improve care.
ShanghaiAges 5–18 - NCT04621396Recruiting
Birth cohort study following families in Manitoba
This study follows pregnant people and their children over time in Manitoba. It aims to better understand diabetes during pregnancy and how it may affect children’s health.
Winnipeg, ManitobaAges Up to 18 years - NCT07547618Recruiting
Pain Management in Recovery Room After Surgery
This study observes how much pain medication patients need right after surgery while they're in the recovery room. Researchers want to understand pain patterns to help improve comfort for future surgical patients.
Ankara, YenimahalleAges 18 years+ - NCT04132310Enrolling by invitation
Study of nutrition during early pregnancy for mothers
This study looks at how nutrition affects mothers and their babies during early pregnancy. You may be able to join if you are pregnant early and meet health and MRI safety requirements.
Austin, TexasAges 18–45 - NCT05391815Recruiting
Observational study of endovascular treatment for blocked leg arteries
This is a real-world observational study that follows people who get minimally invasive procedures to treat blocked arteries in the lower abdomen and pelvis. It aims to understand how well these treatments work in the middle and long term.
ShanghaiAges 18–80 - NCT06375941Recruiting
Watching and learning about early-stage angiosarcoma
This study follows patients with angiosarcoma that has not spread and can be removed with surgery. The goal is to learn more about how this rare cancer behaves and how it is best treated.
Rozzano, MilanoAges Any age - NCT05106387Recruiting
Study follow-up for people who had a kidney transplant
This study follows adults who previously received vonsetamig in an earlier study and then got a kidney transplant while enrolled. It mainly looks at what happens after the transplant and helps doctors understand outcomes over time.
Los Angeles, CaliforniaAges 18–70 - NCT05553873Recruiting
Study links inflammation levels to outcomes in MPN patients
This study looks at inflammation-related lab markers in people with “Ph-negative” myeloproliferative neoplasms (like PV, ET, or PMF) to see how they relate to outcomes and response to treatment. It’s observational, meaning it gathers information from medical records without testing a new treatment.
BariAges 18–99 - NCT07385196Recruiting
Understanding symptoms after ileorectal surgery
This study observes patients who have had a surgery connecting the small intestine to the rectum (ileorectal anastomosis) or who kept their rectum after colon surgery. Researchers want to better understand what symptoms these patients experience, which could help improve care.
DiyarbakırAges 18 years+ - NCT06792994Recruiting
CLL treatment sequence study for patients in GCLLSG trials
This observational study looks at the order of treatments given to people with chronic lymphocytic leukemia (CLL) who took part in certain first-line studies run by the German CLL Study Group. It aims to learn how different treatment sequences affect overall survival over time.
CologneAges 18–99
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 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.