{ "api_version": "1", "request": { "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Blood+Sample+Collection+-+Observational+Study&page=2", "query": { "intervention": "Blood Sample Collection - Observational Study", "page": 2 }, "page_size": 10 }, "pagination": { "page": 2, "page_size": 10, "total_count": 10, "total_pages": 1, "next_page_url": null, "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Blood+Sample+Collection+-+Observational+Study&page=1&page_size=10" }, "source": "remote", "last_synced_at": "2026-09-13T15:25:01.048Z", "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.", "notes": [ "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.", "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.", "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees." ], "trials": [ { "nct_id": "NCT04557748", "title": "LURN: Urinary Urgency Phenotyping Protocol", "overall_status": "COMPLETED", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Lower Urinary Tract Symptoms" ], "interventions": [ { "name": "Observational", "type": "OTHER" }, { "name": "Observational Controls", "type": "OTHER" }, { "name": "Central Sensitization", "type": "OTHER" }, { "name": "Physical Activity and Sleep Tracker", "type": "OTHER" }, { "name": "Physical Activity and Sleep Tracker Controls", "type": "OTHER" }, { "name": "Organ-Based", "type": "OTHER" }, { "name": "Qualitative Assessment of Patients with Urinary Urgency", "type": "OTHER" } ], "intervention_types": [ "OTHER" ], "sponsor": "Arbor Research Collaborative for Health", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 1030, "start_date": "2021-02-17", "completion_date": "2025-08-12", "has_results": false, "last_update_posted_date": "2026-07-24", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 6, "location_summary": "Chicago, Illinois • Iowa City, Iowa • Ann Arbor, Michigan + 3 more", "locations": [ { "city": "Chicago", "state": "Illinois" }, { "city": "Iowa City", "state": "Iowa" }, { "city": "Ann Arbor", "state": "Michigan" }, { "city": "St Louis", "state": "Missouri" }, { "city": "Durham", "state": "North Carolina" } ], "official_url": "https://clinicaltrials.gov/study/NCT04557748" }, { "nct_id": "NCT07645391", "title": "Targeted Early Detection Program in Men at High Genetic Risk for Prostate Cancer", "overall_status": "RECRUITING", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Prostate Carcinoma" ], "interventions": [ { "name": "Non-Interventional Study", "type": "OTHER" } ], "intervention_types": [ "OTHER" ], "sponsor": "University of Michigan Rogel Cancer Center", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "35 Years", "maximum_age": "70 Years", "sex": "MALE", "summary": "35 Years to 70 Years · Male only" }, "enrollment_count": 200, "start_date": "2017-01-01", "completion_date": "2030-01", "has_results": false, "last_update_posted_date": "2026-06-12", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 1, "location_summary": "Ann Arbor, Michigan", "locations": [ { "city": "Ann Arbor", "state": "Michigan" } ], "official_url": "https://clinicaltrials.gov/study/NCT07645391" }, { "nct_id": "NCT03180268", "title": "Observation or Radiation Therapy in Treating Patients With Newly Diagnosed Grade II Meningioma That Has Been Completely Removed by Surgery", "overall_status": "RECRUITING", "study_type": "INTERVENTIONAL", "phases": [ "PHASE3" ], "conditions": [ "Grade 2 Meningioma", "Intracranial Meningioma" ], "interventions": [ { "name": "Biospecimen Collection", "type": "PROCEDURE" }, { "name": "Clinical Observation", "type": "OTHER" }, { "name": "Intensity-Modulated Radiation Therapy", "type": "RADIATION" }, { "name": "Laboratory Biomarker Analysis", "type": "OTHER" }, { "name": "Magnetic Resonance Imaging", "type": "PROCEDURE" }, { "name": "Proton Beam Radiation Therapy", "type": "RADIATION" }, { "name": "Quality-of-Life Assessment", "type": "OTHER" } ], "intervention_types": [ "PROCEDURE", "OTHER", "RADIATION" ], "sponsor": "NRG Oncology", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 163, "start_date": "2017-09-12", "completion_date": "2032-06-15", "has_results": false, "last_update_posted_date": "2026-09-10", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 198, "location_summary": "Birmingham, Alabama • Phoenix, Arizona • Scottsdale, Arizona + 162 more", "locations": [ { "city": "Birmingham", "state": "Alabama" }, { "city": "Phoenix", "state": "Arizona" }, { "city": "Phoenix", "state": "Arizona" }, { "city": "Scottsdale", "state": "Arizona" }, { "city": "Tucson", "state": "Arizona" } ], "official_url": "https://clinicaltrials.gov/study/NCT03180268" }, { "nct_id": "NCT01783990", "title": "Pediatric Hydroxyurea Phase III Clinical Trial (BABY HUG) Follow-up Observational Study II Protocol", "overall_status": "COMPLETED", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Sickle Cell Anemia" ], "interventions": [ { "name": "Hydroxyurea", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "National Heart, Lung, and Blood Institute (NHLBI)", "sponsor_class": "NIH", "healthy_volunteers": false, "eligibility": { "minimum_age": "24 Months", "maximum_age": "18 Years", "sex": "ALL", "summary": "24 Months to 18 Years" }, "enrollment_count": 150, "start_date": "2012-10", "completion_date": "2016-12-31", "has_results": true, "last_update_posted_date": "2020-08-20", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 14, "location_summary": "Birmingham, Alabama • Washington D.C., District of Columbia • Miami, Florida + 9 more", "locations": [ { "city": "Birmingham", "state": "Alabama" }, { "city": "Washington D.C.", "state": "District of Columbia" }, { "city": "Washington D.C.", "state": "District of Columbia" }, { "city": "Miami", "state": "Florida" }, { "city": "Atlanta", "state": "Georgia" } ], "official_url": "https://clinicaltrials.gov/study/NCT01783990" }, { "nct_id": "NCT06279572", "title": "Immune Profile of Acute Myeloid Leukemia Patients Receiving Azacitidine Plus Venetoclax Induction Chemotherapy", "overall_status": "RECRUITING", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Acute Myeloid Leukemia" ], "interventions": [ { "name": "Biospecimen Collection", "type": "PROCEDURE" }, { "name": "Bone Marrow Aspirate", "type": "PROCEDURE" }, { "name": "Electronic Health Record Review", "type": "OTHER" } ], "intervention_types": [ "PROCEDURE", "OTHER" ], "sponsor": "Mayo Clinic", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 80, "start_date": "2021-04-22", "completion_date": "2027-12-31", "has_results": false, "last_update_posted_date": "2026-04-01", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 3, "location_summary": "Scottsdale, Arizona • Jacksonville, Florida • Rochester, Minnesota", "locations": [ { "city": "Scottsdale", "state": "Arizona" }, { "city": "Jacksonville", "state": "Florida" }, { "city": "Rochester", "state": "Minnesota" } ], "official_url": "https://clinicaltrials.gov/study/NCT06279572" }, { "nct_id": "NCT04239573", "title": "Comparing the Clinical Impact of Pancreatic Cyst Surveillance Programs and Associated Biomarkers", "overall_status": "RECRUITING", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Pancreatic Neoplasm" ], "interventions": [ { "name": "Biopsy Procedure", "type": "PROCEDURE" }, { "name": "Biospecimen Collection", "type": "PROCEDURE" }, { "name": "Computed Tomography", "type": "PROCEDURE" }, { "name": "Endoscopic Ultrasound", "type": "PROCEDURE" }, { "name": "Endoscopic Ultrasound-Guided Fine-Needle Aspiration", "type": "PROCEDURE" }, { "name": "Magnetic Resonance Imaging", "type": "PROCEDURE" }, { "name": "Quality-of-Life Assessment", "type": "OTHER" }, { "name": "Questionnaire Administration", "type": "OTHER" }, { "name": "Surgical Procedure", "type": "PROCEDURE" } ], "intervention_types": [ "PROCEDURE", "OTHER" ], "sponsor": "ECOG-ACRIN Cancer Research Group", "sponsor_class": "NETWORK", "healthy_volunteers": false, "eligibility": { "minimum_age": "50 Years", "maximum_age": "75 Years", "sex": "ALL", "summary": "50 Years to 75 Years" }, "enrollment_count": 770, "start_date": "2020-06-16", "completion_date": "2034-11-11", "has_results": false, "last_update_posted_date": "2026-09-04", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 413, "location_summary": "Birmingham, Alabama • Mobile, Alabama • Anchorage, Alaska + 294 more", "locations": [ { "city": "Birmingham", "state": "Alabama" }, { "city": "Mobile", "state": "Alabama" }, { "city": "Anchorage", "state": "Alaska" }, { "city": "Anchorage", "state": "Alaska" }, { "city": "Anchorage", "state": "Alaska" } ], "official_url": "https://clinicaltrials.gov/study/NCT04239573" }, { "nct_id": "NCT07071051", "title": "Exploring the Effect of Calaspargase Pegol on the Coagulation System in Pediatric Acute Lymphoblastic Leukemia (ALL) Patients: Pilot Study", "overall_status": "RECRUITING", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Childhood Acute Lymphoblastic Leukemia", "Childhood Lymphoblastic Lymphoma" ], "interventions": [ { "name": "Non-Interventional Study", "type": "OTHER" } ], "intervention_types": [ "OTHER" ], "sponsor": "Mayo Clinic", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "2 Years", "maximum_age": "22 Years", "sex": "ALL", "summary": "2 Years to 22 Years" }, "enrollment_count": 15, "start_date": "2025-07-31", "completion_date": "2026-12-31", "has_results": false, "last_update_posted_date": "2026-02-13", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 1, "location_summary": "Rochester, Minnesota", "locations": [ { "city": "Rochester", "state": "Minnesota" } ], "official_url": "https://clinicaltrials.gov/study/NCT07071051" }, { "nct_id": "NCT06117930", "title": "Study of Human Brain-Gut Axis and Gut Microbiome in Patients With Brain Lesions - Repository for Neuroscience Research", "overall_status": "RECRUITING", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Malignant Central Nervous System Neoplasm" ], "interventions": [ { "name": "Non-Interventional Study", "type": "OTHER" } ], "intervention_types": [ "OTHER" ], "sponsor": "Mayo Clinic", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 100, "start_date": "2024-02-28", "completion_date": "2029-12-13", "has_results": false, "last_update_posted_date": "2026-02-05", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 1, "location_summary": "Jacksonville, Florida", "locations": [ { "city": "Jacksonville", "state": "Florida" } ], "official_url": "https://clinicaltrials.gov/study/NCT06117930" }, { "nct_id": "NCT06151730", "title": "Evaluation of Hypertension Management and Cardiovascular Adverse Event Prevention in Patients With B-cell Malignancies Undergoing Treatment With Bruton Tyrosine Kinase Inhibitors, the HALT Study", "overall_status": "RECRUITING", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Chronic Lymphocytic Leukemia", "Hematopoietic and Lymphoid System Neoplasm", "Mantle Cell Lymphoma", "Marginal Zone Lymphoma", "Waldenstrom Macroglobulinemia" ], "interventions": [ { "name": "Non-Interventional Study", "type": "OTHER" } ], "intervention_types": [ "OTHER" ], "sponsor": "Mayo Clinic", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": null, "maximum_age": null, "sex": "ALL", "summary": "Not listed" }, "enrollment_count": 100, "start_date": "2024-01-05", "completion_date": "2026-06-30", "has_results": false, "last_update_posted_date": "2026-02-27", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 1, "location_summary": "Rochester, Minnesota", "locations": [ { "city": "Rochester", "state": "Minnesota" } ], "official_url": "https://clinicaltrials.gov/study/NCT06151730" }, { "nct_id": "NCT03116633", "title": "Concordance of Inivata Liquid Biopsy With Standard Tissue Biopsy", "overall_status": "COMPLETED", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Non-Small Cell Lung Cancer" ], "interventions": [], "intervention_types": [], "sponsor": "Inivata", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 34, "start_date": "2017-06-30", "completion_date": "2018-12-31", "has_results": false, "last_update_posted_date": "2019-05-16", "last_synced_at": "2026-09-13T15:25:01.048Z", "location_count": 6, "location_summary": "Fort Smith, Arkansas • Joplin, Missouri • Springfield, Missouri + 3 more", "locations": [ { "city": "Fort Smith", "state": "Arkansas" }, { "city": "Joplin", "state": "Missouri" }, { "city": "Springfield", "state": "Missouri" }, { "city": "Oklahoma City", "state": "Oklahoma" }, { "city": "Allentown", "state": "Pennsylvania" } ], "official_url": "https://clinicaltrials.gov/study/NCT03116633" } ] }