Clinical trials
Observational Study clinical trials
Below are recruiting observational study clinical trials, each written for real people, not researchers. We’re tracking 820 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT02748226Recruiting
Study of artery procedures for leg artery disease outcomes
This study looks at results of a minimally invasive procedure done inside blood vessels (endovascular therapy) for people with painful or worsening leg artery disease. It uses both past (retrospective) and future (prospective) patient information to better understand outcomes.
SeoulAges 20 years+ - NCT06859515Recruiting
Long-term follow-up for wet AMD treatment
This study checks on the long-term safety and effects of a one-time treatment (EXG102-031) for wet age-related macular degeneration. It is only for people who already received that treatment in a previous study.
BeijingAges 50 years+ - NCT06781034Recruiting
MRI appearance of brain bleeds in different small vessel diseases
This study looks at how different types of small blood vessel disease in the brain affect the appearance of a recent brain bleed on MRI. It may help doctors better understand and manage these bleeds.
Nîmes, GardAges 18 years+ - NCT06527872Recruiting
Study of belimumab for lupus kidney disease in real life
This study looks at how well belimumab (Benlysta) works in real-world settings for adults with lupus nephritis (kidney inflammation caused by lupus). If you started belimumab in the past 6–24 months, the researchers will review your medical records to see how your kidney health has changed.
Baltimore, MarylandAges 18 years+ - NCT06252948Recruiting
Gut bacteria study for POEMS and related plasma cell disorders
This study looks at the gut microbiome (the bacteria living in your digestive system) in people with POEMS syndrome, multiple myeloma, MGUS, amyloidosis, and healthy household members. It may help researchers understand how gut health relates to these conditions.
Rochester, MinnesotaAges 18 years+ - NCT07616778Recruiting
Study of Babies Born at 22 Weeks Gestation
This study follows babies born at exactly 22 weeks of pregnancy (very early, before typical viability) who were cared for in a hospital's neonatal intensive care unit. Researchers want to understand outcomes and care practices for these extremely premature infants.
Middlesbrough, TeesideAges Any age - NCT07080970Recruiting
Observational study of AML with NPM1 mutation
This study is observing leukemia patients who have a certain gene change (NPM1 mutation) to better understand their disease and early blood vessel problems.
FlorenceAges 18 years+ - NCT06803160Enrolling by invitation
Comparing two surgeries for uterovesical fistula repair
This trial compares two laparoscopic (keyhole) surgery methods to fix a uterovesical fistula, which is an abnormal opening between the bladder and uterus that can happen after C-section or other pelvic surgery. The goal is to see which method works best.
CairoAges Any age - NCT06588803Enrolling by invitation
Long-term follow-up after EXG001-307 for type 1 SMA
This study follows up on patients with type 1 spinal muscular atrophy (SMA) who already received the EXG001-307 gene therapy in a previous trial. The goal is to monitor their long-term health and safety over time.
Shanghai, Shanghai MunicipalityAges 1 month+ - NCT06680895Recruiting
FeNO study in ICU patients with breathing support
This study measures a lung inflammation marker called FeNO in ICU patients on a breathing machine. It may help doctors understand lung health and guide treatment.
Shanghai, Shanghai MunicipalityAges 18–80 - NCT06959030Recruiting
Study of Henagliflozin for Type 2 Diabetes
This study tests how safe and effective the diabetes medication henagliflozin is for Chinese patients with type 2 diabetes. It is an observational study, meaning you will continue your regular care while researchers watch your progress.
Beihai, GuangxiAges 18–80 - NCT05995418Recruiting
Cost and health impact study for Alzheimer's in China
This study looks at the financial and health effects of Alzheimer's disease and mild cognitive impairment (aMCI) in China. It aims to understand how the disease affects patients and families over time.
BeijingAges 40–100 - NCT07217977Enrolling by invitation
Study testing QbMobile app for ADHD treatment monitoring
This trial tests if a smartphone app called QbMobile can help monitor ADHD treatment. It is for people who are newly diagnosed or not taking ADHD medication.
Mobile, AlabamaAges 6–60 - NCT07031661Recruiting
Bipolar disorder risk study for teens and children
This study follows children and teens who may be at higher risk for bipolar disorder to develop a prediction model. It includes three groups: those with a parent who has bipolar disorder, those with atypical depression, and healthy volunteers.
Shanghai, Shanghai MunicipalityAges 6–18 - NCT04770571Enrolling by invitation
Study of posterior neck and upper-back spine fixation systems
This trial studies specific surgical hardware used to stabilize the back of the neck and upper back during spine surgery. It may help surgeons compare outcomes for people needing fixation for trauma, instability, failed prior fusion, tumors, or certain degenerative conditions.
Orange, CaliforniaAges 18 years+ - NCT06076226Recruiting
Donor telomere length and leukemia transplant outcomes
This trial looks at whether the length of telomeres (the protective caps at the ends of chromosomes) in donor blood cells affects recovery for people with acute leukemia who receive a stem cell transplant. It aims to see if a simple donor blood test can predict how well the transplant works.
Hangzhou, ZhejiangAges 5–90 - NCT06718972Recruiting
Lung cancer with brain lining spread: real-world treatment study
This study looks at how people with non-small cell lung cancer that has spread to the lining of the brain or spinal cord are treated in real-world clinics in China. If you have received treatment for this spread since 2018, you may be able to help doctors learn what works best.
Guangzhou, GuangdongAges Any age - NCT06887348Recruiting
Long-term safety study for prior RP1, RP2, or RP3 patients
This study checks the long-term safety of patients who have already received RP1, RP2, or RP3 treatment in a previous study. It helps doctors understand any side effects that may appear over time.
La Jolla, CaliforniaAges 18 years+ - NCT06465810Recruiting
Observational study for ATTR amyloidosis patients
This study follows patients with ATTR amyloidosis over time to understand how the disease affects them. It does not test a new treatment—instead, it asks you to fill out questionnaires about your health and symptoms to help doctors learn more about the condition.
La Jolla, CaliforniaAges 18–130 - NCT05889806Enrolling by invitation
Study uses blood and tissue samples for gene and protein testing
This study collects and analyzes your donated samples (like blood or other biospecimens) to look for patterns in genes and proteins. The results may help researchers understand disease biology and improve future tests or treatments.
New Orleans, LouisianaAges 18 years+ - NCT07291921Recruiting
Blood tests before and after lung cancer surgery
This study looks at changes in small molecules, genetic material, and other markers in the blood before and after lung cancer surgery. The goal is to develop a simple blood test to monitor patients over time and see if the cancer comes back.
Beijing, Beijing MunicipalityAges 18–85 - NCT06903325Recruiting
Monitoring DNA markers in blood to predict colorectal cancer return after surgery
This study tests if a simple blood test can detect early signs of colorectal cancer coming back after surgery to remove cancer spread in the abdomen. It may help patients avoid unnecessary treatments and catch recurrence sooner.
Shanghai, Shanghai MunicipalityAges 18 years+ - NCT06837181Recruiting
Understanding diabetes complications in cystic fibrosis
This study looks at how long-term diabetes affects people with cystic fibrosis. It helps researchers understand complications and improve care.
Birmingham, AlabamaAges 12 years+ - NCT06562777Recruiting
How symptoms differ between men and women during immunotherapy
This study looks at how symptoms during immunotherapy (a cancer treatment that boosts your immune system) may differ between men and women. Researchers will follow people with cancer who are starting immunotherapy to see if men and women report different side effects.
Portland, OregonAges 18 years+
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Common questions
- Are there clinical trials for observational study?
- Yes. Clin2 currently lists 820 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.