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
- NCT06716359Enrolling by invitation
Comparing two pain medicines after C-section
This trial compares two pain relievers, hydromorphone and nalbuphine, given through a patient-controlled pump after cesarean section. It aims to find which provides better pain control with fewer side effects.
Wuhan, HubeiAges 20–50 - NCT06461351Recruiting
Long-term study of patients treated with Inaticabtagene Autoleucel
This study is a long-term follow-up for people who have already received Inaticabtagene Autoleucel, a type of cell therapy. It checks how patients are doing over time, and does not involve any new treatments.
Tianjin, Tianjin MunicipalityAges 18 years+ - NCT06695897Recruiting
Long-term real-world study of Dupilumab for eosinophilic esophagitis
This study looks at how well Dupilumab works over time in people aged 12 and older with eosinophilic esophagitis (EoE) whose symptoms are not well controlled by standard treatments. It aims to understand the medicine's effects in everyday medical practice.
Aschaffenburg, BavariaAges 12 years+ - NCT06699953Enrolling by invitation
EEG study of fentanyl and how it relates to drug liking
This study looks at how fentanyl affects brain waves (EEG) and whether those brain changes are linked to how much a person likes the drug. If you are having surgery with fentanyl, you may be able to join.
Palo Alto, CaliforniaAges 18 years+ - NCT06513273Recruiting
New treatments for AML in the real world
This study looks at how well new AML medicines work in everyday medical practice, outside of clinical trials. If you are starting a newer AML drug like gilteritinib, an IDH inhibitor, oral azacytidine, or others, you may be able to join.
San Giovanni RotondoAges 18 years+ - NCT06679088Enrolling by invitation
GlyCoBrain: Brain health in Paderborn students
This observational study at Paderborn University looks at how diet and lifestyle affect brain health in young adults. Researchers will ask you to fill out questionnaires and maybe do simple memory tests, with no change to your routine.
Paderborn, North-Rhine-WestfaliaAges 18–25 - NCT06680401Recruiting
EHE: An Observational Study for People With This Rare Tumor
This study is tracking people with a rare blood vessel tumor called epithelioid hemangioendothelioma (EHE) to learn more about how it behaves and how best to care for you. By joining, you'll help doctors improve future treatments for this condition.
MilanAges 18 years+ - NCT06679517Enrolling by invitation
Long-term follow-up for severe aortic stenosis patients considered for TAVI
This study follows patients with severe aortic stenosis (a heart valve condition) who are being evaluated for a keyhole procedure called TAVI. It aims to understand their long-term outcomes after the standard evaluation process.
FerraraAges 18 years+ - NCT06676137Recruiting
Coronary microvascular disease study in China
This study looks at chest pain caused by tiny blood vessels in the heart that don't show up on standard angiograms. It aims to understand this condition better to help find better care.
ZhengzhouAges 18–85 - NCT06663358Recruiting
Safety and effectiveness of Elfabrio in Fabry disease patients
This study is for people with Fabry disease who are taking or planning to take the medication Elfabrio (pegunigalsidase alfa). It will look at how safe and effective the treatment is in real-world use.
Birmingham, AlabamaAges 18 years+ - NCT05739123Recruiting
Pregnancy safety registry for relugolix-containing medicines
This is an observational study that collects real-world information about pregnancy outcomes when relugolix-containing therapy is taken during pregnancy. It aims to better understand safety for both the parent during pregnancy and the child after birth.
Wilmington, North CarolinaAges birth+ - NCT06647264Enrolling by invitation
Study on computer-aided risk prediction for liver and gallbladder surgery
This study uses a computer program to help doctors predict risks and outcomes for patients having laparoscopic liver or gallbladder surgery. It may help improve how doctors plan and manage your care before, during, and after surgery.
Guangzhou, GuangdongAges 18–80 - NCT06654284Enrolling by invitation
Quality of life after ICD implant or battery change
This study looks at how people feel and live their daily lives after getting an ICD or having the battery changed. Researchers want to understand your quality of life over time.
LeuvenAges 18 years+ - NCT06641726Recruiting
Global database linking genetics and health records for mental illness
This trial is building a research database that combines genetic information and long-term health data to improve personalized treatment for serious mental illness. You may be eligible if you have been diagnosed or treated for depression, bipolar disorder, schizophrenia, or dementia.
Oxford, OxfordAges 18–110 - NCT06636045Enrolling by invitation
Blood flow restriction after ACL surgery with quad graft
This study tests whether using a special blood flow restriction cuff after ACL surgery helps you recover faster and stronger. It is for people having ACL reconstruction using their own quadriceps tendon for the first time.
Kansas City, KansasAges 14–40 - NCT06631261Recruiting
Stepper test for lung and heart health in bronchiectasis
This study compares how the heart and lungs respond to a 6-minute stepper exercise in people with bronchiectasis versus healthy adults. It aims to better understand the physical impact of bronchiectasis on daily activities.
AnkaraAges 18 years+ - NCT06620471Recruiting
Better nerve blocks with impedance testing
This study looks at whether adding impedance testing to ultrasound guidance improves accuracy for arm and leg nerve blocks. If you need a nerve block for surgery, this may help us learn how to make them safer and more effective.
Beirut, BeirutAges 18–90 - NCT06624982Recruiting
Bone Changes After Tooth Extraction and Grafting
This study looks at how your jawbone changes after a tooth is pulled and a bone graft is put in. If you need a single tooth removed and have good general health, you may be able to join.
Milwaukee, WisconsinAges 18–75 - NCT06607302Recruiting
Study of ivosidenib for bile duct cancer with IDH1 mutation
This study is looking at how well the drug ivosidenib works for people with a certain type of bile duct cancer (cholangiocarcinoma) that has a specific change in the IDH1 gene. It is for people whose cancer has spread or cannot be removed by surgery and who have already tried at least one other cancer treatment.
AugsburgAges 18 years+ - NCT06606340Enrolling by invitation
Long-term study of eteplirsen, golodirsen, or casimersen for DMD
This study follows people with Duchenne muscular dystrophy (DMD) who are taking eteplirsen, golodirsen, or casimersen. It aims to understand how these medicines work in everyday life over a long period.
Little Rock, ArkansasAges Any age - NCT06587854Recruiting
Study on fluid congestion in acute heart failure patients
This study looks at different patterns of fluid buildup in people with acute heart failure. It aims to understand how these patterns relate to treatment with water pills (diuretics) and may help improve care.
GroningenAges 18 years+ - NCT06503367Recruiting
Observation study for children 0-5 with LAMA2 muscular dystrophy
This study follows young children with LAMA2-related congenital muscular dystrophy to learn more about the disease. It does not test a new treatment, so it may help families understand the condition better and prepare for future trials.
Los Angeles, CaliforniaAges Up to 5 years - NCT06506084Recruiting
Study of ropeginterferon alfa-2b for polycythemia vera
This study looks at how well a drug called ropeginterferon alfa-2b works for people with polycythemia vera. It aims to understand the drug's effects and safety when used as a first or later treatment option.
Bergamo, LombardyAges 18–100 - NCT03809585Recruiting
Study of iris tumors and healthy eyes
This observational study looks at eyes with iris tumors and compares them to eyes without iris problems. The goal is to better understand how iris circulation and related eye measurements differ, which may help future care.
Portland, OregonAges 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.