Clinical trials
Observational Study clinical trials
Below are recruiting observational study clinical trials, each written for real people, not researchers. We’re tracking 845 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT05590715Recruiting
Study of autism details using health records
This observational study looks at different groups of people with autism spectrum disorder (ASD) using existing medical records and caregiver reports. It may help researchers better understand what different autistic subgroups need, without giving an experimental treatment.
Phoenix, ArizonaAges 12–65 - NCT05590949Recruiting
Study of bone problems after stopping breast cancer medicines
This observational study looks at bone complications in post-menopausal women with breast cancer after stopping denosumab and an aromatase inhibitor. It may help doctors better understand who is at risk for bone weakening and fractures after these medicines are stopped.
Basking Ridge, New JerseyAges 18 years+ - NCT05604716Recruiting
Surgery Patients: Digestive and Social Function Follow-Up Study
This study checks how your digestion and daily social functioning may change after surgery. It looks at results from completed questionnaires filled out after your diagnosis to understand what issues patients face.
Beijing, Beijing MunicipalityAges Any age - NCT05625750Recruiting
Study of people diagnosed with fatty liver from not-too-much alcohol
This is an observational study for people diagnosed with nonalcoholic fatty liver disease (fatty buildup in the liver not mainly caused by heavy drinking). It may help researchers better understand this condition, especially how it shows up on tests and how people report relevant health information.
Changsha, HunanAges 18–75 - NCT05629104Recruiting
Predicting long-term outcomes after aortic valve procedure
This study follows people who have aortic valve treatment to better predict how they will do in the long term. It may help doctors understand what outcomes to expect after the procedure and improve future care.
UppsalaAges 18 years+ - NCT05632978Recruiting
Study of epilepsy using real-world patient data
This is an observational study that looks at how epilepsy is diagnosed and how people do over time, using information from routine care. It may help doctors better understand epilepsy biology and outcomes using real-world data.
CardiffAges 16 years+ - NCT05640102Recruiting
Study of zanubrutinib in Waldenström macroglobulinemia
This is an observational study that follows people with Waldenström macroglobulinemia (WM) to learn how well zanubrutinib works and how safe it is. Your results will be tracked in relation to your disease features, including a blood/marrow marker called MYD88.
Huntsville, AlabamaAges 18 years+ - NCT05643014Recruiting
Study of chemical exposure in firefighters’ urine
This observational study looks at how common environmental chemicals may build up in firefighters, measured with urine samples before and after exposure. It may help researchers understand potential health risks in this job—even though you won’t receive study medicine.
Minneapolis, MinnesotaAges 18 years+ - NCT05650619Recruiting
Study of return of kidney disease after transplant
This observational study looks at people with FSGS or minimal change disease whose kidney disease came back after a transplant. The goal is to better understand patterns of recurrence and what factors may be linked to it.
Ann Arbor, MichiganAges Any age - NCT05668338Recruiting
Hearing-device registry study for MED-EL users
This is an observational study that collects information from people using MED-EL hearing devices (with or without an implant) to better understand real-world hearing care. It may help improve future planning, support, and device use for patients like you.
BochumAges Any age - NCT05677243Recruiting
Observational study of radiosurgery for trigeminal neuralgia pain
This study follows people with trigeminal neuralgia to see how radiosurgery treatment affects their facial pain. It may help doctors better understand who benefits when medicines do not control the pain enough.
MonacoAges 18 years+ - NCT05679284Recruiting
Study for retained needle fragments in people who inject drugs
This observational study looks at whether small pieces of drug-injection needles remain in injection sites. You may help by answering a questionnaire and getting X-ray images, which could improve how care and safety are handled for people who inject drugs.
TampereAges 18 years+ - NCT05686447Recruiting
Testing blood samples to study multiple myeloma
This study looks at stored blood (serum) samples to see whether a lab test called MALDI-TOF mass spectrometry can help analyze multiple myeloma proteins. If you have multiple myeloma (or are a healthy matched control), your existing lab samples may be used for testing.
Guangzhou, GuangdongAges Any age - NCT05686278Recruiting
Study of long-term outcomes after hip hemiarthroplasty
This is an observational study that follows people over time after hip hemiarthroplasty (a partial hip replacement). It aims to understand how well Corin hip devices work long-term in everyday care, and what outcomes to expect.
Amboise, FranceAges 18 years+ - NCT05696002Recruiting
Track outcomes after advanced pelvic cancer surgery
This study follows people who have advanced pelvic cancer surgery that removes more than one pelvic organ. It’s an observational study, meaning it mainly collects data to help improve how future surgeries and care are planned.
GlasgowAges Any age - 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 - NCT05724121Recruiting
Study heart rhythm changes during BTK or venetoclax treatment
This observational study tracks how your heart rhythm (heartbeat pattern) changes while you take a BTK inhibitor or venetoclax. It may help doctors better understand heart rhythm risks in people receiving these cancer-related medicines.
Bethesda, MarylandAges 18–110 - NCT05728359Recruiting
Genetic study of outcomes in cardiogenic shock
This study looks at whether a person’s genetic information (genomics) can help predict outcomes in cardiogenic shock. You may be asked to give consent and provide information during a serious heart-related emergency, usually soon after symptoms start.
LondonAges 18–80 - 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+ - NCT05744466Recruiting
Compare two psoriasis medicines using real-world patient data
This study looks at how well two common plaque psoriasis medicines—deucravacitinib and apremilast—work in everyday care. It may help researchers understand which option performs better in real patients outside of a traditional drug trial.
Waltham, MassachusettsAges 18 years+ - NCT05752656Recruiting
Tracking outcomes after deep brain stimulation for Parkinson’s
This study follows people with Parkinson’s disease to see how their thinking, behavior, and movement change over time after deep brain stimulation. It may help doctors better understand what to expect from this treatment.
RomeAges 18 years+ - NCT05780099Recruiting
Study of patients treated in internal medicine clinics
This observational study follows people receiving care in Internal Medicine at San Raffaele Hospital to better understand what kinds of conditions they have. It does not test a new treatment, but your information may help improve future care.
MilanAges 18 years+ - NCT05814237Recruiting
Study of new respiratory infections starting within 10 days
This is an observational study that follows adults who are newly sick with a respiratory infection that started within the past 10 days. It may help researchers understand what causes these infections and how patients do in emergency or hospital-care settings.
BrusselsAges 18 years+ - NCT05818332Recruiting
ClassIntra® tool to improve outcomes during surgery
This trial tests whether using an in-the-operating-room learning/documentation tool (ClassIntra®) can improve care and outcomes for patients during surgery. You may be invited if you’re having certain inpatient operations with anesthesia involvement.
NijmegenAges 18–110
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Common questions
- Are there clinical trials for observational study?
- Yes. Clin2 currently lists 845 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.