{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=23",
    "query": {
      "intervention": "observational study",
      "page": 23
    },
    "page_size": 10
  },
  "pagination": {
    "page": 23,
    "page_size": 10,
    "total_count": 4385,
    "total_pages": 439,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=24&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=22&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-20T00:21:14.819Z",
  "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": "NCT00726778",
      "title": "Admixture Mapping of Ethnic and Racial Insulin Complex Outcomes",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Healthy"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Alabama at Birmingham",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "7 Years",
        "maximum_age": "12 Years",
        "sex": "ALL",
        "summary": "7 Years to 12 Years"
      },
      "enrollment_count": 360,
      "start_date": "2004-05",
      "completion_date": "2010-12",
      "has_results": false,
      "last_update_posted_date": "2011-03-16",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 1,
      "location_summary": "Birmingham, Alabama",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00726778"
    },
    {
      "nct_id": "NCT05040178",
      "title": "An Observational Study of Carbaglu® for the Treatment of MMA and PA in Adults and Pediatrics",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hyperammonemia",
        "Methylmalonic Acidemia",
        "Propionic Acidemia"
      ],
      "interventions": [
        {
          "name": "Carglumic Acid",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "RECORDATI GROUP",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 20,
      "start_date": "2022-06-30",
      "completion_date": "2032-06-30",
      "has_results": false,
      "last_update_posted_date": "2025-04-15",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 5,
      "location_summary": "Washington D.C., District of Columbia • Tampa, Florida • Chicago, Illinois + 2 more",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Tampa",
          "state": "Florida"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05040178"
    },
    {
      "nct_id": "NCT04708015",
      "title": "Retrospective Study of Glucose Monitoring for Glycemic Control in Patients With GSDIa",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Glycogen Storage Disease Type IA"
      ],
      "interventions": [
        {
          "name": "No Intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Ultragenyx Pharmaceutical Inc",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "8 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "8 Years and older"
      },
      "enrollment_count": 15,
      "start_date": "2020-11-05",
      "completion_date": "2022-03-04",
      "has_results": false,
      "last_update_posted_date": "2024-05-29",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04708015"
    },
    {
      "nct_id": "NCT04272216",
      "title": "An Observational Study of Radial Access Embolization Procedures Using HydroPearl Microspheres",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Uterine Fibroid",
        "Arteriovenous Malformations",
        "Hypervascular Tumors",
        "Benign Prostatic Hyperplasia"
      ],
      "interventions": [
        {
          "name": "Treatment with HydroPearl via radial access",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Terumo Medical Corporation",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 99,
      "start_date": "2020-02-06",
      "completion_date": "2023-03-11",
      "has_results": true,
      "last_update_posted_date": "2025-09-09",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 6,
      "location_summary": "Los Angeles, California • Chicago, Illinois • St Louis, Missouri + 3 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Chapel Hill",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04272216"
    },
    {
      "nct_id": "NCT05464615",
      "title": "Geisinger Antibiotic Allergy Pilot Program: Assess and Address",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Penicillin Allergy"
      ],
      "interventions": [
        {
          "name": "Amoxicillin",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Geisinger Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 20,
      "start_date": "2024-03-04",
      "completion_date": "2026-01-20",
      "has_results": false,
      "last_update_posted_date": "2026-07-20",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 4,
      "location_summary": "Danville, Pennsylvania • Lewiston, Pennsylvania • Scranton, Pennsylvania + 1 more",
      "locations": [
        {
          "city": "Danville",
          "state": "Pennsylvania"
        },
        {
          "city": "Lewiston",
          "state": "Pennsylvania"
        },
        {
          "city": "Scranton",
          "state": "Pennsylvania"
        },
        {
          "city": "Wilkes-Barre",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05464615"
    },
    {
      "nct_id": "NCT04904276",
      "title": "Observational Study of Fostamatinib as Second Line Therapy in Adult Patients With Immune Thrombocytopenia (ITP) and Insufficient Response to a Prior Therapy",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "ITP",
        "Immune Thrombocytopenia"
      ],
      "interventions": [
        {
          "name": "Fostamatinib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Rigel Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "18 Years to 100 Years"
      },
      "enrollment_count": 16,
      "start_date": "2021-05-18",
      "completion_date": "2022-11-17",
      "has_results": false,
      "last_update_posted_date": "2024-03-15",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 14,
      "location_summary": "Tamarac, Florida • Springfield, Illinois • Kansas City, Kansas + 10 more",
      "locations": [
        {
          "city": "Tamarac",
          "state": "Florida"
        },
        {
          "city": "Springfield",
          "state": "Illinois"
        },
        {
          "city": "Kansas City",
          "state": "Kansas"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04904276"
    },
    {
      "nct_id": "NCT02059499",
      "title": "Imiquimod, Fluorouracil, or Observation in Treating HIV-Positive Patients With High-Grade Anal Squamous Skin Lesions",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Anal Intraepithelial Neoplasia",
        "High-grade Squamous Intraepithelial Lesion",
        "HIV Infection"
      ],
      "interventions": [
        {
          "name": "imiquimod",
          "type": "DRUG"
        },
        {
          "name": "fluorouracil",
          "type": "DRUG"
        },
        {
          "name": "questionnaire administration",
          "type": "OTHER"
        },
        {
          "name": "laboratory biomarker analysis",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "AIDS Malignancy Consortium",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "21 Years and older"
      },
      "enrollment_count": 91,
      "start_date": "2015-12-28",
      "completion_date": "2024-05-02",
      "has_results": true,
      "last_update_posted_date": "2025-07-23",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 12,
      "location_summary": "Los Angeles, California • San Francisco, California • Atlanta, Georgia + 6 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "New Orleans",
          "state": "Louisiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02059499"
    },
    {
      "nct_id": "NCT00321438",
      "title": "Observational Study of HIV-Infected Subjects With X4-Tropic or Non-Phenotypeable Virus",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "HIV Infection"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 150,
      "start_date": "2005-07",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2009-05-18",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 15,
      "location_summary": "Los Angeles, California • Tarzana, California • Washington D.C., District of Columbia + 11 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Tarzana",
          "state": "California"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Fort Myers",
          "state": "Florida"
        },
        {
          "city": "Key West",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00321438"
    },
    {
      "nct_id": "NCT06609135",
      "title": "Relationship Between EIT and Respiratory Status in Very Preterm Infants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Chronic Lung Disease of Prematurity",
        "Bronchopulmonary Dysplasia",
        "Premature Lungs"
      ],
      "interventions": [
        {
          "name": "Sentec LuMon Device (EIT system)",
          "type": "DEVICE"
        },
        {
          "name": "Sentec Digital Monitoring System (transcutaneous CO2 monitor)",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Lawrence Rhein",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "5 Days",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "5 Days and older"
      },
      "enrollment_count": 20,
      "start_date": "2023-11-04",
      "completion_date": "2024-08-31",
      "has_results": true,
      "last_update_posted_date": "2025-10-09",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 1,
      "location_summary": "Worcester, Massachusetts",
      "locations": [
        {
          "city": "Worcester",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06609135"
    },
    {
      "nct_id": "NCT01475747",
      "title": "Systolic Pressure Intervention Trial Factors Affecting Factors Affecting Atherosclerosis Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hypertension",
        "Chronic Kidney Disease"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Utah",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 595,
      "start_date": "2011-09",
      "completion_date": "2018-12",
      "has_results": false,
      "last_update_posted_date": "2019-01-04",
      "last_synced_at": "2026-10-20T00:21:14.819Z",
      "location_count": 12,
      "location_summary": "Palo Alto, California • Denver, Colorado • Washington D.C., District of Columbia + 7 more",
      "locations": [
        {
          "city": "Palo Alto",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Jacksonville",
          "state": "Florida"
        },
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01475747"
    }
  ]
}