Clinical trials
Observational Study clinical trials
Below are recruiting observational study clinical trials, each written for real people, not researchers. We’re tracking 841 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 - NCT06712017Enrolling by invitation
Radioactive beads treatment for liver cancer in China
This study looks at how patients with liver cancer (HCC) respond to a treatment called SIR-Spheres, which are tiny radioactive beads placed in the liver. It is for people who received this treatment in 2023 or early 2024 and were checked for tumor response within six months after treatment.
Guangzhou, GuangdongAges 18 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+ - 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+ - 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 - 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 - 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 - NCT06270719Enrolling by invitation
Comparing ELEVIDYS to standard care for Duchenne muscular dystrophy
This study compares the gene therapy ELEVIDYS (delandistrogene moxeparvovec) to usual treatments for people with Duchenne muscular dystrophy (DMD). It helps researchers understand how well ELEVIDYS works over time in real-world settings.
Little Rock, ArkansasAges 4 years+ - NCT05942859Enrolling by invitation
AI study using heart ECGs to spot pulmonary hypertension
This study looks at patterns on a 12-lead ECG (a common heart tracing) to help diagnose pulmonary hypertension, using results from a right heart catheter test. It may help doctors use ECGs better in the future, without changing your current care.
BathAges 18 years+ - NCT05921240Enrolling by invitation
Study on access to vision care for young people with vision needs
This study looks at what gets in the way of getting vision services for children and teens with special vision needs. It will help identify barriers and solutions by using questionnaires and interviews in Chinese.
TaipeiAges 19–99 - NCT05851755Enrolling by invitation
Italian lung cancer study observing care and outcomes
This is an observational study of people with lung cancer. The goal is to better understand care patterns and outcomes; joining would involve giving consent and answering study questions.
L’AquilaAges 18 years+ - NCT05794373Enrolling by invitation
Training physiotherapists for disabling low back pain
This observational study looks at how well municipality-based physiotherapists manage disabling low back pain after specific training. It focuses on people with significant low back pain symptoms to see what care works best in real-world settings.
MiddelfartAges 18–65 - NCT05779475Enrolling by invitation
Study of people with moderate Parkinson’s disease
This is an observational study, meaning it doesn’t test a new drug—researchers mainly follow people to better understand moderate Parkinson’s disease and who may be good candidates for future cell therapy. If you have moderate symptoms that aren’t well controlled with tablets, this study may help inform better future treatments.
Irvine, CaliforniaAges 50–68 - NCT05654883Enrolling by invitation
Study of mpox immunity in people who were vaccinated or infected
This observational study looks at how your body’s defenses work against mpox (monkeypox), based on blood and health information. You may be eligible if you recently got an mpox vaccine or have had mpox infection and are now out of isolation.
New York, New YorkAges 18–100 - NCT05477004Enrolling by invitation
Study of ketamine infusions for ongoing chronic pain
This study is observing people with chronic pain who are getting ketamine infusions at Stanford. You may help by completing email surveys about how you feel, which can help the team understand the treatment’s impact.
Stanford, CaliforniaAges 18 years+ - NCT04660955Enrolling by invitation
10-year follow-up MRI after ACL surgery in young athletes
This study uses an MRI scan to look at knees 10 years after ACL reconstruction. It helps researchers understand how the knee changes over time after sports-related ACL injury, and how well reconstruction lasts.
Cleveland, OhioAges 22–45 - NCT04246060Enrolling by invitation
Quality-of-life study for people with cystinosis
This is an observational study that asks people with nephropathic cystinosis about their quality of life while taking cystine-depleting treatment (cysteamine). It may help researchers better understand how this condition and treatment affect daily living.
AntwerpAges Any age - NCT06050304Recruiting
Crack cocaine use and behavioral sensitization study
This study looks at how your body and mind might get more sensitive to crack-cocaine over time (behavioral sensitization) and what you expect from using it. Your participation helps us better understand addiction patterns.
ParisAges 18 years+ - NCT06560983Recruiting
Blood sugar and stroke outcomes over one year
This study watches how blood sugar levels affect recovery and risks over one year in people who come to the ER with a stroke. It aims to help doctors better manage blood sugar during emergency stroke care.
Kathmandu, BagmatiAges 18 years+ - NCT06953167Recruiting
Dementia study for older adults with prior brain checks
This study follows older adults who have already had amyloid testing, to track changes in memory and thinking over time. It helps researchers understand how to prevent dementia.
LondonAges 65 years+ - NCT07620470Recruiting
Brain Tumor Imaging Study Using Advanced CT Scans
This study examines how a specialized CT scanner (Spectral CT) captures detailed images of brain tumors. Researchers will review your imaging scans to understand how well this technology helps doctors see and understand brain tumors.
Wuhan, HubeiAges 18 years+ - NCT07263620Recruiting
Gut bacteria and cancer treatment before surgery
This study looks at the bacteria in your gut to see if they can predict how well chemotherapy or radiation works before surgery for certain cancers. If you have pancreatic, stomach, colon, or esophageal cancer that has spread nearby (but not to distant organs), you may be able to join.
TianjinAges Any age - NCT06862843Recruiting
Family eating habits and chronic inflammation study
This study looks at how eating habits and family health history relate to chronic inflammatory conditions like Crohn's disease, ulcerative colitis, and juvenile idiopathic arthritis. It aims to understand these links by studying families with a child or adult affected by these conditions, as well as healthy families.
Florence, ItalyAges Any age - NCT07225738Recruiting
Multiple Myeloma treatment and cannabis use study
This study follows people with newly diagnosed multiple myeloma to see how their cancer treatments and use of medications, including cannabis, affect their health. It will help doctors learn more about what works best.
Goodyear, ArizonaAges 18 years+
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Common questions
- Are there clinical trials for observational study?
- Yes. Clin2 currently lists 841 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.