{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+study&page=4",
    "query": {
      "intervention": "Observational study",
      "page": 4
    },
    "page_size": 10
  },
  "pagination": {
    "page": 4,
    "page_size": 10,
    "total_count": 4385,
    "total_pages": 439,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+study&page=5&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+study&page=3&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-17T11:57:50.917Z",
  "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": "NCT02662153",
      "title": "Incidence and Predictors of Opioid Overdose and Death Among Long-Term Users of Opioid Analgesics",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Opioid Overdose"
      ],
      "interventions": [
        {
          "name": "Observation only",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Member Companies of the Opioid PMR Consortium",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "79 Years",
        "sex": "ALL",
        "summary": "18 Years to 79 Years"
      },
      "enrollment_count": 808455,
      "start_date": "2019-05-02",
      "completion_date": "2021-06-30",
      "has_results": false,
      "last_update_posted_date": "2022-07-14",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 4,
      "location_summary": "Wilmington, Delaware • Boston, Massachusetts • Portland, Oregon + 1 more",
      "locations": [
        {
          "city": "Wilmington",
          "state": "Delaware"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Portland",
          "state": "Oregon"
        },
        {
          "city": "Nashville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02662153"
    },
    {
      "nct_id": "NCT06263023",
      "title": "A Central Preservation and Assessment Service to Optimize Donor Kidney Allocation",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Organ Preservation"
      ],
      "interventions": [
        {
          "name": "Sub-Normothermic Machine Preservation and Assessment",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "34 Lives, PBC",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "16 Years to 75 Years"
      },
      "enrollment_count": 80,
      "start_date": "2024-04-19",
      "completion_date": "2028-03-25",
      "has_results": false,
      "last_update_posted_date": "2025-04-02",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 8,
      "location_summary": "Chicago, Illinois • Indianapolis, Indiana • St Louis, Missouri + 4 more",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Buffalo",
          "state": "New York"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06263023"
    },
    {
      "nct_id": "NCT07140120",
      "title": "LiveSMART Trial to Prevent Falls in Patients With Cirrhosis - Supplementary Study",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cirrhosis, Liver",
        "Portal Hypertension"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Michigan",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 52,
      "start_date": "2023-06-13",
      "completion_date": "2026-10",
      "has_results": false,
      "last_update_posted_date": "2026-07-22",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 3,
      "location_summary": "Ann Arbor, Michigan • Philadelphia, Pennsylvania • Dallas, Texas",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07140120"
    },
    {
      "nct_id": "NCT02649569",
      "title": "Continuous Activity Monitoring During Fractionated Radiotherapy in Patients With Head and Neck, Lung, or Gastrointestinal Cancer",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Digestive System Carcinoma",
        "Head and Neck Carcinoma",
        "Lung Carcinoma"
      ],
      "interventions": [
        {
          "name": "Monitoring Device",
          "type": "DEVICE"
        },
        {
          "name": "Quality-of-Life Assessment",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DEVICE",
        "OTHER"
      ],
      "sponsor": "Montefiore Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 41,
      "start_date": "2015-06",
      "completion_date": "2017-07",
      "has_results": false,
      "last_update_posted_date": "2026-04-13",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 2,
      "location_summary": "The Bronx, New York",
      "locations": [
        {
          "city": "The Bronx",
          "state": "New York"
        },
        {
          "city": "The Bronx",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02649569"
    },
    {
      "nct_id": "NCT02180451",
      "title": "Observational Study to Investigate the Melatonin and Cortisol Circadian Rhythms of Individuals With Smith-Magenis Syndrome (SMS)",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Smith Magenis Syndrome"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Vanda Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "6 Years to 50 Years"
      },
      "enrollment_count": 8,
      "start_date": "2014-06",
      "completion_date": "2017-01",
      "has_results": false,
      "last_update_posted_date": "2016-03-25",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02180451"
    },
    {
      "nct_id": "NCT07776353",
      "title": "Understanding New Cachexia Subtypes Through Observational Epidemiological Research",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Advanced Colorectal Carcinoma",
        "Advanced Lung Non-Small Cell Carcinoma",
        "Advanced Pancreatic Adenocarcinoma",
        "Stage IV Colorectal Cancer AJCC v8",
        "Stage IV Lung Cancer AJCC v8",
        "Stage IV Pancreatic Cancer AJCC v8",
        "Unresectable Colorectal Carcinoma",
        "Unresectable Lung Non-Small Cell Carcinoma"
      ],
      "interventions": [
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Electronic health record review",
          "type": "OTHER"
        },
        {
          "name": "Medical Device Usage and Evaluation",
          "type": "OTHER"
        },
        {
          "name": "Physical functions assessments",
          "type": "OTHER"
        },
        {
          "name": "Positron Emission Tomography (PET)",
          "type": "PROCEDURE"
        },
        {
          "name": "Survey Administration",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "OTHER"
      ],
      "sponsor": "Kaiser Permanente",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 800,
      "start_date": "2023-04-05",
      "completion_date": "2028-05",
      "has_results": false,
      "last_update_posted_date": "2026-08-20",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 1,
      "location_summary": "Pleasanton, California",
      "locations": [
        {
          "city": "Pleasanton",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07776353"
    },
    {
      "nct_id": "NCT01323439",
      "title": "Axium™ MicroFX™ for Endovascular Repair of IntraCranial Aneurysm-A Multicenter Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Aneurysm"
      ],
      "interventions": [
        {
          "name": "Axium™ MicroFX™ PGLA COILS",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Medtronic Neurovascular Clinical Affairs",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "18 Years to 90 Years"
      },
      "enrollment_count": 99,
      "start_date": "2010-04",
      "completion_date": "2012-10",
      "has_results": false,
      "last_update_posted_date": "2017-08-30",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 1,
      "location_summary": "Gainesville, Florida",
      "locations": [
        {
          "city": "Gainesville",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01323439"
    },
    {
      "nct_id": "NCT07758777",
      "title": "Usability Evaluation of the Intelligent Fingerprinting Drug Screening System",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy Adult Participants"
      ],
      "interventions": [
        {
          "name": "Diagnostic procedures",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Drug Screening",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST",
        "DEVICE"
      ],
      "sponsor": "Intelligent Bio Solutions Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 45,
      "start_date": "2026-07-20",
      "completion_date": "2026-07-24",
      "has_results": false,
      "last_update_posted_date": "2026-08-11",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 1,
      "location_summary": "Marlton, New Jersey",
      "locations": [
        {
          "city": "Marlton",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07758777"
    },
    {
      "nct_id": "NCT00001095",
      "title": "A Study of Three Anti-HIV Drug Combinations in Patients Who Have Taken Amprenavir",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "HIV Infections"
      ],
      "interventions": [
        {
          "name": "Indinavir sulfate",
          "type": "DRUG"
        },
        {
          "name": "Amprenavir",
          "type": "DRUG"
        },
        {
          "name": "Nevirapine",
          "type": "DRUG"
        },
        {
          "name": "Lamivudine",
          "type": "DRUG"
        },
        {
          "name": "Stavudine",
          "type": "DRUG"
        },
        {
          "name": "Zidovudine",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "13 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "13 Years and older"
      },
      "enrollment_count": 94,
      "start_date": null,
      "completion_date": "1999-10",
      "has_results": false,
      "last_update_posted_date": "2021-11-04",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 12,
      "location_summary": "Los Angeles, California • Denver, Colorado • Miami, Florida + 8 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        },
        {
          "city": "Miami",
          "state": "Florida"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00001095"
    },
    {
      "nct_id": "NCT05143619",
      "title": "Impact of \"Teaching the Teachers\" Concept on Global Education and Application of Hepatocellular Carcinoma Diagnosis Guidelines",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hepatocellular Carcinoma"
      ],
      "interventions": [
        {
          "name": "Survey Administration",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 100,
      "start_date": "2019-05-10",
      "completion_date": "2027-02-02",
      "has_results": false,
      "last_update_posted_date": "2026-10-06",
      "last_synced_at": "2026-10-17T11:57:50.917Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05143619"
    }
  ]
}