{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+study+only",
    "query": {
      "intervention": "Observational study only"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 722,
    "total_pages": 73,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+study+only&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-11T18:58:04.244Z",
  "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": "NCT01957085",
      "title": "Undiagnosed Hepatitis C Infection in an Urban Hospital",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hepatitis C"
      ],
      "interventions": [
        {
          "name": "observation only",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Temple University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 366,
      "start_date": "2014-06",
      "completion_date": "2016-01",
      "has_results": true,
      "last_update_posted_date": "2020-04-24",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01957085"
    },
    {
      "nct_id": "NCT02857374",
      "title": "Intravital Microscopy in Identifying Tumor Vessels in Patients With Stage IB-IIIC Melanoma Undergoing Sentinel Lymph Node Biopsy",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Stage IB Skin Melanoma",
        "Stage IIA Skin Melanoma",
        "Stage IIB Skin Melanoma",
        "Stage IIC Skin Melanoma",
        "Stage IIIA Skin Melanoma",
        "Stage IIIB Skin Melanoma",
        "Stage IIIC Skin Melanoma"
      ],
      "interventions": [
        {
          "name": "Diagnostic Microscopy",
          "type": "PROCEDURE"
        },
        {
          "name": "Fluorescein Sodium Injection",
          "type": "DRUG"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Sentinel Lymph Node Biopsy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Roswell Park Cancer Institute",
      "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": "2016-11-03",
      "completion_date": "2022-06-13",
      "has_results": false,
      "last_update_posted_date": "2022-08-01",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 1,
      "location_summary": "Buffalo, New York",
      "locations": [
        {
          "city": "Buffalo",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02857374"
    },
    {
      "nct_id": "NCT02144935",
      "title": "Collaborative Assessment of Pediatric Transverse Myelitis: Understand, Reveal, Educate or CAPTURE Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Myelitis, Transverse",
        "Flaccid Paraplegia, Complete, Acute",
        "Flaccid Paraplegia, Incomplete, Acute"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "Up to 17 Years"
      },
      "enrollment_count": 106,
      "start_date": "2014-05",
      "completion_date": "2022-08-19",
      "has_results": false,
      "last_update_posted_date": "2022-08-23",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02144935"
    },
    {
      "nct_id": "NCT04852458",
      "title": "Glucocorticoid Administration After Traumatic Birth",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Traumatic Birth"
      ],
      "interventions": [
        {
          "name": "Intravenous (IV) hydrocortisone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Michigan",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 133,
      "start_date": "2021-05-21",
      "completion_date": "2022-11-03",
      "has_results": false,
      "last_update_posted_date": "2022-11-09",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 1,
      "location_summary": "Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04852458"
    },
    {
      "nct_id": "NCT01241357",
      "title": "High-Tc Susceptometer to Monitor Transfusional Iron Overload",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Transfusional Iron Overload",
        "Thalassemia Major",
        "Sickle Cell Disease",
        "Myelodysplastic Syndromes",
        "Aplastic Anemia"
      ],
      "interventions": [
        {
          "name": "Hepatic biomagnetic susceptibility measurement",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "5 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "5 Years to 80 Years"
      },
      "enrollment_count": 99,
      "start_date": "2011-03",
      "completion_date": "2016-05",
      "has_results": false,
      "last_update_posted_date": "2016-09-21",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01241357"
    },
    {
      "nct_id": "NCT05632575",
      "title": "The Virtual Promotoras Study: eHealth Intervention to Promote Sexual Health Among Young Latina Women in the US South",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Virtual Promotoras Program",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Alabama, Tuscaloosa",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": "21 Years",
        "sex": "FEMALE",
        "summary": "16 Years to 21 Years · Female only"
      },
      "enrollment_count": 25,
      "start_date": "2024-11-11",
      "completion_date": "2025-08-30",
      "has_results": false,
      "last_update_posted_date": "2026-01-06",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 1,
      "location_summary": "Tuscaloosa, Alabama",
      "locations": [
        {
          "city": "Tuscaloosa",
          "state": "Alabama"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05632575"
    },
    {
      "nct_id": "NCT00991588",
      "title": "Clinical Outcome of Posterior Cruciate Ligament (PCL) Posterolateral Reconstruction",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Knee Injuries"
      ],
      "interventions": [
        {
          "name": "PCL, posterolateral reconstruction",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Sue Barber-Westin",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 20,
      "start_date": "2009-10",
      "completion_date": "2018-12-31",
      "has_results": false,
      "last_update_posted_date": "2019-07-31",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 1,
      "location_summary": "Cincinnati, Ohio",
      "locations": [
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00991588"
    },
    {
      "nct_id": "NCT02019329",
      "title": "A Study of the Safety, Tolerability and Pharmacokientics of RO5545965 in Patients With Schizophrenia on Risperidone",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Schizophrenia"
      ],
      "interventions": [
        {
          "name": "Placebo",
          "type": "OTHER"
        },
        {
          "name": "RO5545965",
          "type": "DRUG"
        },
        {
          "name": "risperidone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DRUG"
      ],
      "sponsor": "Hoffmann-La Roche",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 32,
      "start_date": "2014-01",
      "completion_date": "2014-08",
      "has_results": false,
      "last_update_posted_date": "2016-11-02",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 1,
      "location_summary": "Glendale, California",
      "locations": [
        {
          "city": "Glendale",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02019329"
    },
    {
      "nct_id": "NCT07775872",
      "title": "Prospective Natural History Study of POLG Disease",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "PolG, Primary Mitochondrial Myopathy"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "The POLG Foundation",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "Up to 75 Years"
      },
      "enrollment_count": 300,
      "start_date": "2026-08-01",
      "completion_date": "2031-06-17",
      "has_results": false,
      "last_update_posted_date": "2026-08-20",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 6,
      "location_summary": "San Diego, California • Aurora, Colorado • New York, New York + 3 more",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Akron",
          "state": "Ohio"
        },
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07775872"
    },
    {
      "nct_id": "NCT06088381",
      "title": "Selective Adjuvant Therapy for HPV-mediated Oropharynx SCCs Based on Residual Circulating Tumor DNA Levels (SAVAL)",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Head and Neck Cancer",
        "Head and Neck Squamous Cell Carcinoma",
        "Oropharynx Cancer",
        "Oropharynx Squamous Cell Carcinoma",
        "HPV Positive Oropharyngeal Squamous Cell Carcinoma"
      ],
      "interventions": [
        {
          "name": "Experimental Observation",
          "type": "OTHER"
        },
        {
          "name": "Observation per Standard of Care",
          "type": "OTHER"
        },
        {
          "name": "Adjuvant Treatment per Standard of Care",
          "type": "RADIATION"
        },
        {
          "name": "Circulating Tumor DNA test (ctDNA test)",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "OTHER",
        "RADIATION",
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "University of Maryland, Baltimore",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 61,
      "start_date": "2024-03-07",
      "completion_date": "2030-12-18",
      "has_results": false,
      "last_update_posted_date": "2025-11-10",
      "last_synced_at": "2026-09-11T18:58:04.244Z",
      "location_count": 5,
      "location_summary": "Baltimore, Maryland • Bel Air, Maryland • Columbia, Maryland + 1 more",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Bel Air",
          "state": "Maryland"
        },
        {
          "city": "Columbia",
          "state": "Maryland"
        },
        {
          "city": "Glen Burnie",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06088381"
    }
  ]
}