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
- NCT06850038Recruiting
Long-term study of odevixibat in Alagille syndrome
This study follows people with Alagille syndrome who are already taking or starting odevixibat (Bylvay). It looks at how well the medicine works and how safe it is over a long period of time.
Los Angeles, CaliforniaAges Any age - NCT06850220Recruiting
How sleep apnea affects thinking and empathy in kids
This study looks at how obstructive sleep apnea caused by enlarged tonsils or adenoids might affect a child's thinking skills and ability to understand others. It will help doctors learn if treating the sleep problem could also help with these skills.
Suzhou, JiangsuAges 3–12 - NCT04252066Recruiting
Pregnancy and breastfeeding study for women with Fabry disease
This study follows pregnant and breastfeeding women with Fabry disease (and their infants) to better understand what happens during pregnancy and early life. You may or may not be taking migalastat, and the goal is to gather real-world information that could help future care.
Philadelphia, PennsylvaniaAges Any age - NCT06838845Recruiting
A study on upadacitinib for Chinese adults with moderate to severe ulcerative colitis
This study is looking at how well the drug upadacitinib works and how safe it is for Chinese adults with moderate to severe ulcerative colitis. It is not a treatment trial, but will observe patients who are already taking upadacitinib as decided by their doctor.
Guangzhou, GuangdongAges 18 years+ - NCT06837402Enrolling by invitation
Non-invasive ventilation in Argentine ICUs: an observational study
This study looks at how non-invasive breathing support (like a mask or machine) is used in ICUs across Argentina. It helps doctors understand patterns of care so they can improve treatment for patients with breathing problems.
CABA, Buenos AiresAges 18 years+ - NCT05522647Recruiting
Study of risk behaviors in hospitalized confused or agitated patients
This is a study that observes how often and what kinds of “risk behaviors” happen in neurosurgery patients who are agitated or confused. It aims to better understand these behaviors so care can be improved for people who are unable to move or who seem restless.
Clermont-FerrandAges 18 years+ - NCT06822829Recruiting
Study of lymphoma that returned as slow-growing type
This study looks at people whose diffuse large B-cell lymphoma came back as a slower-growing lymphoma. Doctors want to understand how and why this happens, using medical records from diagnosis through follow-up.
Reggio EmiliaAges 18 years+ - NCT06822894Recruiting
3-vessel ultrasound flow study in heart disease patients
This trial uses a special ultrasound to measure blood flow in three main heart arteries. It may help doctors better understand blockages and improve treatment planning.
BeijingAges 18 years+ - NCT06805721Recruiting
Observational study of endovascular treatment for brain and spine vessel conditions
This study follows patients of any age who are having a minimally invasive procedure (endovascular treatment) for blood vessel problems in the brain or spine. It looks at how patients do before and after the procedure, any complications, and what factors might predict a good outcome.
MilanAges Any age - NCT06807515Enrolling by invitation
Safety study of FL Nourish supplement for cancer survivors in remission
This study is testing whether a natural herbal supplement called FL Nourish Capsules is safe for people who have had cancer and are now in remission. It focuses on those with a Traditional Chinese Medicine pattern of Qi deficiency and Blood stasis, which may cause tiredness and poor circulation.
Singapore, SGAges 21–80 - NCT06793709Recruiting
Study of Tasfygo for bile duct cancer with FGFR2 gene change
This study is watching people with a certain type of bile duct cancer that has a specific gene change (FGFR2 fusion). It looks at what happens when they take the drug Tasfygo after their cancer did not respond to chemotherapy.
TokyoAges Any age - NCT05150249Recruiting
Study of older adults after hip fracture treated in hospitals
This is an observational study that follows people age 65 and older after a hip (femur) fracture to learn about their care and outcomes in participating hospitals. It won’t test a new treatment, but your participation may help improve future care for older patients.
BaggiovaraAges 65 years+ - NCT05714917Recruiting
Studying recovery after nerve damage from NOS use
This study looks at how neurological symptoms (like numbness, weakness, unsteadiness, or walking problems) recover after damage caused by NOS use. It may help researchers understand what recovery looks like and what support or treatments could work best.
BirminghamAges 16–40 - NCT06763081Recruiting
SSRI side effects genetics study
This study looks at why some people have behavioral side effects when taking SSRI antidepressants like Prozac or Zoloft. It hopes to find a genetic reason to help doctors choose safer treatments in the future.
Winnipeg, ManitobaAges 6–24 - NCT06751082Recruiting
Sotatercept for pulmonary hypertension study
This study looks at how well the drug Sotatercept works for people with pulmonary hypertension (high blood pressure in the lungs) in a real-world clinic setting. If you are already taking Sotatercept, you may be able to join.
Rochester, MinnesotaAges 18 years+ - NCT06741293Recruiting
Improving colorectal cancer early screening with stool tests
This study looks for markers in stool (poop) to detect colorectal cancer early. If you are between 40 and 74, live in the Lisbon area, and don't have certain digestive or cancer conditions, you may help improve screening by providing a stool sample.
Lisbon, Lisbon DistrictAges 40–74 - NCT04706754Recruiting
Study of lung cancer information across Canada
This observational study collects information from adults with lung cancer to better understand the disease over time. If you join, it helps researchers learn from real-world experiences rather than testing a new drug.
Brampton, OntarioAges 18 years+ - NCT06376448Recruiting
Chronic cough study using a new questionnaire
This study aims to better understand different types of chronic cough by using a new questionnaire. If you have had a cough for at least 8 weeks and do not smoke, you may be able to help.
Cottingham, East YorkshiureAges 18 years+ - NCT06734156Recruiting
Gut microbiome study in colorectal cancer patients
This study looks at how bacteria and other microbes in your gut are linked to colorectal cancer risk and outcomes. By collecting stool samples from people newly diagnosed with colorectal cancer, researchers hope to find patterns that could improve understanding and future treatments.
Lisbon, Lisbon DistrictAges 40–74 - NCT06730477Enrolling by invitation
How well do targeted drugs work for EGFR lung cancer?
This trial studies whether changes in tiny particles in your blood (called exosomes) can show how well targeted therapy is working for lung cancer with an EGFR mutation. You may be eligible if you have this type of lung cancer and are starting your first treatment with a targeted drug.
Wuhan, HubeiAges 18–80 - NCT06662747Recruiting
Vaginal microbiome study for African women
This study is looking at the bacteria living in the vagina to understand what makes a healthy microbiome in African women. You will provide self-collected swabs and attend visits to help researchers learn more about vaginal health.
Kisumu, Kisumu CountyAges 18–40 - NCT06718010Recruiting
Blood markers and breast cancer treatment results
This study looks at how age-related changes in your blood might affect how well your breast cancer treatment works. It includes people with hormone receptor-positive, HER2-negative breast cancer that has not spread to distant organs.
Shanghai, Shanghai MunicipalityAges 18 years+ - NCT06724159Recruiting
Study of funded drugs for genitourinary cancers
This study looks at how well newer funded cancer drugs work for people with cancers of the urinary or reproductive systems, such as bladder, prostate, or kidney cancer. Researchers want to learn about real-world outcomes based on routine care in hospitals across Spain.
Albacete, AlbaceteAges 18 years+ - 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+
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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.