{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+study+-+there+is+no+intervention&page=5",
    "query": {
      "intervention": "Observational study - there is no intervention",
      "page": 5
    },
    "page_size": 10
  },
  "pagination": {
    "page": 5,
    "page_size": 10,
    "total_count": 104,
    "total_pages": 11,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+study+-+there+is+no+intervention&page=6&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+study+-+there+is+no+intervention&page=4&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-10T18:44:57.697Z",
  "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": "NCT06034509",
      "title": "Cognitive and Vascular Functioning Following TBI",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Traumatic Brain Injury",
        "Cognitive Decline",
        "Vascular Dementia"
      ],
      "interventions": [
        {
          "name": "No intervention. This is an observational study.",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Walter Reed National Military Medical Center",
      "sponsor_class": "FED",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "74 Years",
        "sex": "ALL",
        "summary": "18 Years to 74 Years"
      },
      "enrollment_count": 300,
      "start_date": "2023-11-27",
      "completion_date": "2027-05",
      "has_results": false,
      "last_update_posted_date": "2025-09-26",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06034509"
    },
    {
      "nct_id": "NCT04212143",
      "title": "Central Blood Pressure and Pulse Wave Velocity in Kidney Transplant Recipients",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "End Stage Renal Disease"
      ],
      "interventions": [
        {
          "name": "there is no intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Children's National Research Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "3 Years",
        "maximum_age": "21 Years",
        "sex": "ALL",
        "summary": "3 Years to 21 Years"
      },
      "enrollment_count": 150,
      "start_date": "2021-07-01",
      "completion_date": "2026-07-01",
      "has_results": false,
      "last_update_posted_date": "2025-07-03",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "Washington D.C., District of Columbia",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04212143"
    },
    {
      "nct_id": "NCT06080646",
      "title": "Reward Processing and Depressive Subtypes: Identifying Neural Biotypes",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Depression",
        "Depressive Disorder",
        "Major Depressive Disorder",
        "Major Depressive Episode",
        "Depressive Symptoms",
        "Anhedonia"
      ],
      "interventions": [
        {
          "name": "cross-sectional MRI and EEG assessments (NO INTERVENTION)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "San Francisco Veterans Affairs Medical Center",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "18 Years to 70 Years"
      },
      "enrollment_count": 158,
      "start_date": "2021-06-01",
      "completion_date": "2025-09-01",
      "has_results": false,
      "last_update_posted_date": "2026-09-08",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06080646"
    },
    {
      "nct_id": "NCT02234388",
      "title": "Undifferentiated Connective Tissue Disease Registry",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Undifferentiated Connective Tissue Disease"
      ],
      "interventions": [
        {
          "name": "Observation",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Hospital for Special Surgery, New York",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 100,
      "start_date": "2012-03",
      "completion_date": "2027-03-31",
      "has_results": false,
      "last_update_posted_date": "2026-02-12",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02234388"
    },
    {
      "nct_id": "NCT01355432",
      "title": "Heart Rate Changes With Propofol",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Surgical Patients"
      ],
      "interventions": [
        {
          "name": "Observation",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Nationwide Children's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "1 Year",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "1 Year and older"
      },
      "enrollment_count": 40,
      "start_date": "2011-05",
      "completion_date": "2012-05",
      "has_results": false,
      "last_update_posted_date": "2012-05-02",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "Columbus, Ohio",
      "locations": [
        {
          "city": "Columbus",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01355432"
    },
    {
      "nct_id": "NCT06312644",
      "title": "Study of Ultomiris® (Ravulizumab) Safety in Pregnancy",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Ultomiris-exposed Pregnant/ Postpartum",
        "Pregnancy",
        "Paroxysmal Nocturnal Hemoglobinuria (PNH)",
        "Atypical Hemolytic Uremic Syndrome (aHUS)",
        "Generalized Myasthenia Gravis (gMG)",
        "Neuromyelitis Optica Spectrum Disorder (NMOSD)"
      ],
      "interventions": [
        {
          "name": "Ultomiris",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Alexion Pharmaceuticals, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 75,
      "start_date": "2024-12-16",
      "completion_date": "2034-07-11",
      "has_results": false,
      "last_update_posted_date": "2026-04-16",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06312644"
    },
    {
      "nct_id": "NCT05619900",
      "title": "Registry of Patients Diagnosed With Lysosomal Storage Diseases",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Mucopolysaccharidosis I",
        "Mucopolysaccharidosis II",
        "Mucopolysaccharidosis IV A",
        "Mucopolysaccharidosis VI",
        "Mucopolysaccharidosis VII",
        "Pompe Disease Infantile-Onset",
        "Neuronopathic Gaucher Disease",
        "Wolman Disease"
      ],
      "interventions": [
        {
          "name": "There is no intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "Up to 64 Years"
      },
      "enrollment_count": 250,
      "start_date": "2022-05-31",
      "completion_date": "2050-05-31",
      "has_results": false,
      "last_update_posted_date": "2026-04-08",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05619900"
    },
    {
      "nct_id": "NCT03896126",
      "title": "GI-Challenge Study for Gastroparesis Patients and Healthy Controls",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Gastroparesis"
      ],
      "interventions": [
        {
          "name": "Observational",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Stanford University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "49 Years",
        "sex": "ALL",
        "summary": "20 Years to 49 Years"
      },
      "enrollment_count": 43,
      "start_date": "2019-01-01",
      "completion_date": "2025-08-18",
      "has_results": false,
      "last_update_posted_date": "2025-09-04",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "Palo Alto, California",
      "locations": [
        {
          "city": "Palo Alto",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03896126"
    },
    {
      "nct_id": "NCT06381232",
      "title": "Collection and Analyses of Physiological, Physical, and Molecular Data From a Diverse Population",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "General Health",
        "Wellness"
      ],
      "interventions": [
        {
          "name": "No Intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Viome",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 20000,
      "start_date": "2018-07-23",
      "completion_date": "2028-07-23",
      "has_results": false,
      "last_update_posted_date": "2024-04-24",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "Bothell, Washington",
      "locations": [
        {
          "city": "Bothell",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06381232"
    },
    {
      "nct_id": "NCT04788004",
      "title": "Long-term Recovery: Longitudinal Study of Neuro-behavioral Markers of Recovery and Precipitants of Relapse",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Alcohol Use Disorder"
      ],
      "interventions": [
        {
          "name": "Online survey",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Virginia Polytechnic Institute and State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 733,
      "start_date": "2022-09-08",
      "completion_date": "2026-07-14",
      "has_results": false,
      "last_update_posted_date": "2026-08-21",
      "last_synced_at": "2026-10-10T18:44:57.697Z",
      "location_count": 1,
      "location_summary": "Roanoke, Virginia",
      "locations": [
        {
          "city": "Roanoke",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04788004"
    }
  ]
}