Clinical trials
Observational Study clinical trials
Below are recruiting observational study clinical trials, each written for real people, not researchers. We’re tracking 843 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- 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 - NCT04318366Recruiting
Study of COVID-19 samples and how patients respond to treatment
This trial collects and studies COVID-19 test results and other patient information to better predict treatment response and outcomes. Your sample(s) help researchers understand who may improve, worsen, or need different care.
Milan, LombardyAges 18 years+ - NCT04504006Recruiting
Tracking surgery choices for lymph node spread in endometrial cancer
This is an observational study that follows people with endometrial cancer who have had surgery to check and remove pelvic (and sometimes paraaortic) lymph nodes. It looks at how different surgical approaches and any added treatment affect local control (keeping cancer from coming back in the pelvis/nearby areas).
Essen, North Rhine-WestphaliaAges 18 years+ - NCT04561518Recruiting
Study of people with TTR amyloidosis worldwide
This is an observational study (no study drug) for people with transthyretin (TTR)–mediated amyloidosis, including people who carry certain gene changes before symptoms begin. It may help researchers better understand how the disease affects health over time and what to measure in future treatments.
La Jolla, CaliforniaAges Any age - NCT04564989Recruiting
Biomarker study for HPV-related throat cancer outcomes
This observational study checks how well a blood test for HPV DNA (and other tumor genetic markers) predicts outcomes in certain throat cancers. It may help doctors better track the disease and plan treatment, because the trial validates these lab signals against real-world results.
Rochester, MinnesotaAges 18 years+ - NCT04587648Recruiting
Treating cardiac amyloidosis in heart failure with preserved ejection
This trial studies people with heart failure with preserved ejection fraction (HFpEF) and cardiac amyloidosis (an abnormal protein buildup in the heart). It may help researchers understand better treatment for symptoms and heart function in this group.
TaipeiAges 60 years+ - NCT04615104Recruiting
Study of pelvic and hip-joint bone fractures
This study is observing people with pelvic ring and acetabular (hip-joint socket) fractures to better understand what happens over time. It may help doctors improve care, even though it does not test a new treatment.
Charlotte, North CarolinaAges 18 years+ - NCT04654650Recruiting
Study of adults with pulmonary hypertension for long-term data
This study follows adults with pulmonary hypertension over the long term and collects information (and possibly samples) to better understand how the condition changes over time. It may help researchers learn what factors affect outcomes, which can improve care in the future.
Hamburg, Free and Hanseatic City of HamburgAges 18 years+ - NCT04657367Recruiting
Diabetes and prediabetes health tracking registry study
This study is a registry that collects information from people with diabetes, prediabetes, or normal blood sugar to better understand these conditions over time. It may help researchers learn which factors are linked to health changes, including future diabetes risk.
Bialystok, Podlaskie VoivodeshipAges Any age - NCT04667026Recruiting
Study of people living with HIV on treatment
This is an observational study that follows people with HIV who are taking HIV medicines (antiretroviral therapy). It may help researchers understand how treatment is going and what factors relate to doing well on therapy.
Guangzhou, GuangdongAges 14 years+ - 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+ - NCT04739319Recruiting
Study of age-related macular degeneration changes
This study looks closely at how age-related macular degeneration (AMD) develops and changes over time by taking detailed eye measurements. It may help researchers better understand disease progression, especially for people who already have AMD.
East Melbourne, VictoriaAges 18 years+ - NCT04746066Recruiting
Study of thalassemia, sickle cell, and inherited anemia with COVID
This observational study looks at people with thalassemia, sickle cell disease, or other inherited anemia who have COVID-19. It aims to learn how COVID affects these conditions and may help improve care planning.
GenovaAges Any age - NCT04845893Recruiting
Study of Ewing and related bone cancers
This is an observational study that follows people with Ewing’s sarcoma of the bone and certain “Ewing-like” tumors. It helps doctors understand the extent of disease at diagnosis and track outcomes, which may guide better planning for future care.
Rozzano, MIAges birth–49 years - NCT04851678Recruiting
Study how stress affects adults with Tourette syndrome
This study follows adults with Tourette syndrome over time to better understand how stressors affect symptoms and daily life. It may help researchers learn what factors make symptoms better or worse and improve future care.
Nashville, TennesseeAges 18 years+ - NCT04862000Recruiting
Study of people with endometriosis or adenomyosis
This is an observational study, meaning researchers watch and describe symptoms and health information over time without testing a new treatment. It may help researchers better understand endometriosis and adenomyosis and how people experience them.
Hong KongAges 18 years+ - NCT04885179Recruiting
Study of SPLIS genetics and patient experiences
This observational study and patient registry collects information from people diagnosed with SPLIS due to specific changes in the SGPL1 gene, including children and newborns. It helps researchers understand the condition better and may improve future care and research planning.
San Francisco, CaliforniaAges Any age - NCT04890067Recruiting
Study of localized high-grade bone cancer in younger patients
This is an observational study (it mainly watches and records care) for people with high-grade osteosarcoma in an arm or leg. It may help doctors learn which care approaches work best for younger patients with localized disease.
Aviano, PordenoneAges Up to 40 years - NCT04918329Recruiting
Digestive symptom check-in study for adults
This study follows adults with long-lasting “functional” digestive symptoms as part of routine care. It may help researchers better understand these conditions and improve how they are managed.
RouenAges 18 years+ - NCT05040178Recruiting
Study of Carbaglu® use for MMA and PA
This observational study looks at how Carbaglu® is used and how well it works for people with methylmalonic acidemia (MMA) or propionic acidemia (PA). It may help doctors understand real-world care for adults and children living with these conditions.
Washington D.C., District of ColumbiaAges Any age - NCT05046613Recruiting
Pregnancy outcomes after rimegepant use for migraine
This observational study looks at health outcomes for moms, babies, and infants after rimegepant is used during pregnancy for migraine. It may help doctors understand potential risks or reassuring safety information for future pregnancies.
Wilmington, North CarolinaAges birth+ - NCT05097820Recruiting
Study of silicone gel testicular implants after placement
This is an observational study that follows people who receive silicone gel-filled testicular implants. It aims to collect real-world information about safety and healing to help improve future care.
Ghent, East-FlandersAges birth–110 years - NCT05099315Recruiting
Gut microbiome study in adults with severe eczema
This trial studies the gut microbiome in people with moderate to severe atopic dermatitis (eczema) who are starting or already receiving systemic (whole-body) treatment. It may help researchers understand what changes in gut bacteria are linked to eczema and to treatment response.
Berlin, State of BerlinAges 18 years+ - NCT05098821Recruiting
Study factors that affect eczema control on dupilumab
This trial studies why eczema (“atopic dermatitis”) varies in severity even when people receive the medicine dupilumab. It may help doctors better predict who responds well and how to monitor treatment.
BerlinAges 18–75
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Common questions
- Are there clinical trials for observational study?
- Yes. Clin2 currently lists 843 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.