{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=31",
    "query": {
      "intervention": "observational study",
      "page": 31
    },
    "page_size": 10
  },
  "pagination": {
    "page": 31,
    "page_size": 10,
    "total_count": 4385,
    "total_pages": 439,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=32&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=30&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-20T07:57:23.306Z",
  "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": "NCT03778502",
      "title": "DOAC in Unusual Site Venous Thrombosis",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Splanchnic Vein Thrombosis",
        "Cerebral Vein Thrombosis",
        "Ovarian Vein Thrombosis",
        "Renal Vein Thrombosis",
        "Retinal Vein Thrombosis"
      ],
      "interventions": [
        {
          "name": "Direct Oral Anticoagulants",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Malta",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 358,
      "start_date": "2019-10-01",
      "completion_date": "2024-12-31",
      "has_results": false,
      "last_update_posted_date": "2025-07-03",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 1,
      "location_summary": "Detroit, Michigan",
      "locations": [
        {
          "city": "Detroit",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03778502"
    },
    {
      "nct_id": "NCT06870981",
      "title": "Optimizing Nutrition and Milk (Opti-NuM) Project",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Very Low Birth Weight Baby",
        "Early Nutrition and the Preterm Infant",
        "Nutritional Requirements",
        "Human Milk Fortification",
        "Human Milk Microbiome",
        "Human Milk Feeding",
        "Human Milk Nutrition",
        "Growth &Amp; Development"
      ],
      "interventions": [
        {
          "name": "Opti-NuM is an observational secondary use of data/samples study, the investigators will analyze information and specimens from the MaxiMoM platform RCTs. No interventions form part of this study.",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "The Hospital for Sick Children",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "1 Hour",
        "maximum_age": "21 Days",
        "sex": "ALL",
        "summary": "1 Hour to 21 Days"
      },
      "enrollment_count": 1100,
      "start_date": "2010-10-01",
      "completion_date": "2027-12",
      "has_results": false,
      "last_update_posted_date": "2025-03-11",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 2,
      "location_summary": "Palo Alto, California • San Diego, California",
      "locations": [
        {
          "city": "Palo Alto",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06870981"
    },
    {
      "nct_id": "NCT03039881",
      "title": "Evaluation of Non-Invasive Respiratory Volume Monitor",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Monitoring for Low Minute Ventilation Post Surgery"
      ],
      "interventions": [
        {
          "name": "Non-Invasive Respiratory Volume Monitor",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Tufts 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": 150,
      "start_date": "2015-01-09",
      "completion_date": "2019-01-08",
      "has_results": false,
      "last_update_posted_date": "2019-01-09",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03039881"
    },
    {
      "nct_id": "NCT00285831",
      "title": "Mild Depression 2 Week Observational Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Depressive Disorder"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Stanford University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 36,
      "start_date": "2005-12",
      "completion_date": "2009-03",
      "has_results": false,
      "last_update_posted_date": "2019-09-09",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 1,
      "location_summary": "Stanford, California",
      "locations": [
        {
          "city": "Stanford",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00285831"
    },
    {
      "nct_id": "NCT06401330",
      "title": "A Study Using Risk Factors to Determine Treatment for Children With Favorable Histology Wilms Tumors (FHWT)",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Stage I Mixed Cell Type Kidney Wilms Tumor",
        "Stage II Mixed Cell Type Kidney Wilms Tumor",
        "Stage III Mixed Cell Type Kidney Wilms Tumor",
        "Stage IV Mixed Cell Type Kidney Wilms Tumor"
      ],
      "interventions": [
        {
          "name": "Bone Scan",
          "type": "PROCEDURE"
        },
        {
          "name": "Carboplatin",
          "type": "DRUG"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Cyclophosphamide",
          "type": "DRUG"
        },
        {
          "name": "Dactinomycin",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Doxorubicin",
          "type": "DRUG"
        },
        {
          "name": "Etoposide",
          "type": "DRUG"
        },
        {
          "name": "Irinotecan",
          "type": "DRUG"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Nephrectomy",
          "type": "PROCEDURE"
        },
        {
          "name": "Patient Observation",
          "type": "OTHER"
        },
        {
          "name": "Positron Emission Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Ultrasound Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Vincristine",
          "type": "DRUG"
        },
        {
          "name": "X-Ray Imaging",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "DRUG",
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "Children's Oncology Group",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "30 Years",
        "sex": "ALL",
        "summary": "Up to 30 Years"
      },
      "enrollment_count": 1656,
      "start_date": "2025-04-15",
      "completion_date": "2031-02-13",
      "has_results": false,
      "last_update_posted_date": "2026-08-25",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 154,
      "location_summary": "Birmingham, Alabama • Mobile, Alabama • Anchorage, Alaska + 129 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06401330"
    },
    {
      "nct_id": "NCT07444528",
      "title": "Upper Airway Ultrasound to Predict Difficult Laryngoscopy in Neonates and Infants",
      "overall_status": "ENROLLING_BY_INVITATION",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Neonates",
        "Infants Aged 0 Days to 12 Months Scheduled for Elective Surgery"
      ],
      "interventions": [
        {
          "name": "Upper airway ultrasound",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Children's Hospital of Philadelphia",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "365 Days",
        "sex": "ALL",
        "summary": "Up to 365 Days"
      },
      "enrollment_count": 180,
      "start_date": "2026-03-02",
      "completion_date": "2027-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-03-04",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07444528"
    },
    {
      "nct_id": "NCT06709001",
      "title": "An Observational Study to Assess Malnutrition Risk",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Malnutrition"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Abbott Nutrition",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "1 Year",
        "maximum_age": "5 Years",
        "sex": "ALL",
        "summary": "1 Year to 5 Years"
      },
      "enrollment_count": 206,
      "start_date": "2024-12-09",
      "completion_date": "2025-07-25",
      "has_results": false,
      "last_update_posted_date": "2025-09-10",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 1,
      "location_summary": "Kansas City, Missouri",
      "locations": [
        {
          "city": "Kansas City",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06709001"
    },
    {
      "nct_id": "NCT02907281",
      "title": "Optical Coherence Tomography (OCT) Trial in Multiple Sclerosis",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Multiple Sclerosis",
        "RRMS"
      ],
      "interventions": [
        {
          "name": "Observational",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Novartis Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 414,
      "start_date": "2012-05-29",
      "completion_date": "2017-07-24",
      "has_results": false,
      "last_update_posted_date": "2017-11-17",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 5,
      "location_summary": "San Francisco, California • Torrance, California • Iowa City, Iowa + 2 more",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Torrance",
          "state": "California"
        },
        {
          "city": "Iowa City",
          "state": "Iowa"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02907281"
    },
    {
      "nct_id": "NCT01409681",
      "title": "A Multi-Centered Trial Evaluating the Role of Vitamin D Metabolism in Non-Small Cell Lung Cancer",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Non-Small Cell Lung Cancer"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Michigan Rogel Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "18 Years to 80 Years"
      },
      "enrollment_count": 41,
      "start_date": "2011-05",
      "completion_date": "2013-12",
      "has_results": false,
      "last_update_posted_date": "2014-03-31",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 2,
      "location_summary": "Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        },
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01409681"
    },
    {
      "nct_id": "NCT03001037",
      "title": "dorsaVi Back Pain and Movement Registry",
      "overall_status": "SUSPENDED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Low Back Pain"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "dorsaVi Ltd",
      "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": 350,
      "start_date": "2016-10",
      "completion_date": "2020-04",
      "has_results": false,
      "last_update_posted_date": "2019-02-08",
      "last_synced_at": "2026-10-20T07:57:23.306Z",
      "location_count": 3,
      "location_summary": "Washington DC, Maryland • Arlington, Virginia",
      "locations": [
        {
          "city": "Washington DC",
          "state": "Maryland"
        },
        {
          "city": "Washington DC",
          "state": "Maryland"
        },
        {
          "city": "Arlington",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03001037"
    }
  ]
}