{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=No+intervention%2C+observational+study&page=8",
    "query": {
      "intervention": "No intervention, observational study",
      "page": 8
    },
    "page_size": 10
  },
  "pagination": {
    "page": 8,
    "page_size": 10,
    "total_count": 645,
    "total_pages": 65,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=No+intervention%2C+observational+study&page=9&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=No+intervention%2C+observational+study&page=7&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-07T10:22:48.662Z",
  "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": "NCT07746167",
      "title": "Pupillary Dilation Reflex in Healthy Volunteers",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Healthy Participants"
      ],
      "interventions": [
        {
          "name": "No intervention (observational study)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Children's National Research Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 60,
      "start_date": "2026-04-29",
      "completion_date": "2027-06",
      "has_results": false,
      "last_update_posted_date": "2026-08-04",
      "last_synced_at": "2026-10-07T10:22:48.662Z",
      "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/NCT07746167"
    },
    {
      "nct_id": "NCT00329836",
      "title": "A Research Study to Examine Cutaneous Allodynia and Cluster Headache",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cluster Headache"
      ],
      "interventions": [
        {
          "name": "There are no interventions in the observational study. The symptom of allodynia was measured.",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Thomas Jefferson University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 41,
      "start_date": "2006-08",
      "completion_date": "2008-02",
      "has_results": true,
      "last_update_posted_date": "2025-02-28",
      "last_synced_at": "2026-10-07T10:22:48.662Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00329836"
    },
    {
      "nct_id": "NCT03750344",
      "title": "ChroniSense Polso Wrist Worn Respiration Rate Validation Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Respiratory Rate"
      ],
      "interventions": [
        {
          "name": "Diagnostic test",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "ChroniSense Medical Ltd.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 20,
      "start_date": "2018-11-06",
      "completion_date": "2018-11-30",
      "has_results": false,
      "last_update_posted_date": "2019-02-05",
      "last_synced_at": "2026-10-07T10:22:48.662Z",
      "location_count": 1,
      "location_summary": "Louisville, Colorado",
      "locations": [
        {
          "city": "Louisville",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03750344"
    },
    {
      "nct_id": "NCT02519998",
      "title": "Tissue Repository and Master Database for Concussion Biomarker and Risk Calculator Development",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Brain Concussion"
      ],
      "interventions": [
        {
          "name": "Concussion",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Thomas Jefferson University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "10 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "10 Years and older"
      },
      "enrollment_count": 1000,
      "start_date": "2015-03",
      "completion_date": "2016-12",
      "has_results": false,
      "last_update_posted_date": "2015-08-11",
      "last_synced_at": "2026-10-07T10:22:48.662Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02519998"
    },
    {
      "nct_id": "NCT02761187",
      "title": "An Observational Study of Presentation, Treatment Patterns, and Outcomes in Multiple Myeloma Participants",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Multiple Myeloma"
      ],
      "interventions": [
        {
          "name": "No Intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Takeda",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 4253,
      "start_date": "2016-07-01",
      "completion_date": "2021-09-30",
      "has_results": true,
      "last_update_posted_date": "2025-02-24",
      "last_synced_at": "2026-10-07T10:22:48.662Z",
      "location_count": 43,
      "location_summary": "Little Rock, Arkansas • La Jolla, California • Santa Rosa, California + 39 more",
      "locations": [
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Santa Rosa",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02761187"
    },
    {
      "nct_id": "NCT06801678",
      "title": "Refractive Outcomes Utilizing Two SS-OCT Biometers for IOL Power Calculations",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cataract"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "The Eye institute of Utah",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "21 Years and older"
      },
      "enrollment_count": 50,
      "start_date": "2025-01-09",
      "completion_date": "2025-02-22",
      "has_results": false,
      "last_update_posted_date": "2025-01-30",
      "last_synced_at": "2026-10-07T10:22:48.662Z",
      "location_count": 1,
      "location_summary": "Salt Lake City, Utah",
      "locations": [
        {
          "city": "Salt Lake City",
          "state": "Utah"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06801678"
    },
    {
      "nct_id": "NCT05586243",
      "title": "MAGNETIC RESONANCE SPECTROSCOPY BIOMARKERS IN TYPE 3 GAUCHER DISEASE (GD3)",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Gaucher Disease, Type 3"
      ],
      "interventions": [
        {
          "name": "No intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Minnesota",
      "sponsor_class": "OTHER",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "18 Years to 80 Years"
      },
      "enrollment_count": 5,
      "start_date": "2023-01-01",
      "completion_date": "2026-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-08-04",
      "last_synced_at": "2026-10-07T10:22:48.662Z",
      "location_count": 1,
      "location_summary": "Minneapolis, Minnesota",
      "locations": [
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05586243"
    },
    {
      "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": "2026-10-07T10:22:48.662Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05619900"
    },
    {
      "nct_id": "NCT04091984",
      "title": "The PROspera Kidney Transplant ACTIVE Rejection Assessment Registry (ProActive)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Kidney Transplant Rejection"
      ],
      "interventions": [
        {
          "name": "Prospera",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Natera, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 5000,
      "start_date": "2019-11-06",
      "completion_date": "2027-10-01",
      "has_results": false,
      "last_update_posted_date": "2024-08-06",
      "last_synced_at": "2026-10-07T10:22:48.662Z",
      "location_count": 55,
      "location_summary": "Birmingham, Alabama • Phoenix, Arizona • Scottsdale, Arizona + 45 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04091984"
    },
    {
      "nct_id": "NCT02522793",
      "title": "Optical Spectroscopy for Cutaneous Cancer",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Suspicious Skin Lesion(s) Requiring a Biopsy"
      ],
      "interventions": [
        {
          "name": "No intervention; this is an observational study",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Duke University",
      "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": "2016-05",
      "completion_date": "2017-02-03",
      "has_results": false,
      "last_update_posted_date": "2017-07-11",
      "last_synced_at": "2026-10-07T10:22:48.662Z",
      "location_count": 1,
      "location_summary": "Durham, North Carolina",
      "locations": [
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02522793"
    }
  ]
}