{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+Study&page=2",
    "query": {
      "intervention": "Observational Study",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 10,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+Study&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-09-02T04:51:50.517Z",
  "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": "NCT07636525",
      "title": "Sleep and Adolescent Vaccine Immunogenicity Pilot/Observational Study",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Vaccination"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Children's Hospital Medical Center, Cincinnati",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "11 Years",
        "maximum_age": "12 Years",
        "sex": "ALL",
        "summary": "11 Years to 12 Years"
      },
      "enrollment_count": 66,
      "start_date": "2026-07",
      "completion_date": "2027-07",
      "has_results": false,
      "last_update_posted_date": "2026-06-09",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 1,
      "location_summary": "Cincinnati, Ohio",
      "locations": [
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07636525"
    },
    {
      "nct_id": "NCT05147389",
      "title": "Artificial Intelligence for Digital Cholangioscopy Neoplasia Diagnosis",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Common Bile Duct Neoplasms",
        "Non-Neoplastic Bile Duct Disorder"
      ],
      "interventions": [
        {
          "name": "AI model classification",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "DSOC endoscopist experts' classification",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Instituto Ecuatoriano de Enfermedades Digestivas",
      "sponsor_class": "OTHER",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "79 Years",
        "sex": "ALL",
        "summary": "18 Years to 79 Years"
      },
      "enrollment_count": 170,
      "start_date": "2020-10-01",
      "completion_date": "2022-05-01",
      "has_results": false,
      "last_update_posted_date": "2022-11-17",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 3,
      "location_summary": "New Brunswick, New Jersey • Houston, Texas",
      "locations": [
        {
          "city": "New Brunswick",
          "state": "New Jersey"
        },
        {
          "city": "Houston",
          "state": "Texas"
        },
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05147389"
    },
    {
      "nct_id": "NCT03010150",
      "title": "Blood Tests and Questionnaires in Studying Adherence to Preventative Swallowing Exercises in Participants With Metastatic Head and Neck Cancer",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Carcinoma of Unknown Primary",
        "Clinical Stage I HPV-Mediated (p16-Positive) Oropharyngeal Carcinoma AJCC v8",
        "Clinical Stage II HPV-Mediated (p16-Positive) Oropharyngeal Carcinoma AJCC v8",
        "Clinical Stage III HPV-Mediated (p16-Positive) Oropharyngeal Carcinoma AJCC v8",
        "Metastatic Head and Neck Carcinoma",
        "Metastatic Malignant Neoplasm in the Uterine Cervix",
        "Pathologic Stage I HPV-Mediated (p16-Positive) Oropharyngeal Carcinoma AJCC v8",
        "Pathologic Stage II HPV-Mediated (p16-Positive) Oropharyngeal Carcinoma AJCC v8",
        "Pathologic Stage III HPV-Mediated (p16-Positive) Oropharyngeal Carcinoma AJCC v8",
        "Stage I Hypopharyngeal Carcinoma AJCC v8",
        "Stage I Nasopharyngeal Carcinoma AJCC v8",
        "Stage II Hypopharyngeal Carcinoma AJCC v8",
        "Stage II Laryngeal Cancer AJCC v8",
        "Stage II Nasopharyngeal Carcinoma AJCC v8",
        "Stage II Oropharyngeal (p16-Negative) Carcinoma AJCC v8",
        "Stage III Hypopharyngeal Carcinoma AJCC v8",
        "Stage III Laryngeal Cancer AJCC v8",
        "Stage III Nasopharyngeal Carcinoma AJCC v8",
        "Stage III Oropharyngeal (p16-Negative) Carcinoma AJCC v8",
        "Stage IV Hypopharyngeal Carcinoma AJCC v8",
        "Stage IV Laryngeal Cancer AJCC v8",
        "Stage IV Nasopharyngeal Carcinoma AJCC v8",
        "Stage IV Oropharyngeal (p16-Negative) Carcinoma AJCC v8",
        "Stage IVA Hypopharyngeal Carcinoma AJCC v8",
        "Stage IVA Laryngeal Cancer AJCC v8",
        "Stage IVA Nasopharyngeal Carcinoma AJCC v8",
        "Stage IVA Oropharyngeal (p16-Negative) Carcinoma AJCC v8",
        "Stage IVB Hypopharyngeal Carcinoma AJCC v8",
        "Stage IVB Laryngeal Cancer AJCC v8",
        "Stage IVB Nasopharyngeal Carcinoma AJCC v8",
        "Stage IVB Oropharyngeal (p16-Negative) Carcinoma AJCC v8"
      ],
      "interventions": [
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "OTHER"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 471,
      "start_date": "2016-12-29",
      "completion_date": "2028-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-04-15",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03010150"
    },
    {
      "nct_id": "NCT07210125",
      "title": "Implementation and Deliver of Lenacapavir for PrEP in a Community Pharmacy Setting",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "HIV"
      ],
      "interventions": [
        {
          "name": "Lenacapavir long-acting",
          "type": "DRUG"
        },
        {
          "name": "Standard of Care (SOC)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Kelley-Ross & Associates, Inc.",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 75,
      "start_date": "2025-09-16",
      "completion_date": "2027-06-30",
      "has_results": false,
      "last_update_posted_date": "2026-04-02",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 1,
      "location_summary": "Seattle, Washington",
      "locations": [
        {
          "city": "Seattle",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07210125"
    },
    {
      "nct_id": "NCT00002540",
      "title": "Screening for Prostate Cancer in Older Patients (PLCO Screening Trial)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Prostate Carcinoma"
      ],
      "interventions": [
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Medical Examination Assessment",
          "type": "PROCEDURE"
        },
        {
          "name": "Screening Questionnaire Administration",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER",
        "PROCEDURE"
      ],
      "sponsor": "National Cancer Institute (NCI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": "74 Years",
        "sex": "MALE",
        "summary": "55 Years to 74 Years · Male only"
      },
      "enrollment_count": 76685,
      "start_date": "1993-11-16",
      "completion_date": "2027-06-30",
      "has_results": true,
      "last_update_posted_date": "2026-07-24",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00002540"
    },
    {
      "nct_id": "NCT05438485",
      "title": "Natural History Study of Patients With Methylmalonic Acidemia and Propionic Acidemia",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Methylmalonic Acidemia",
        "Propionic Acidemia"
      ],
      "interventions": [
        {
          "name": "Registry",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "HemoShear Therapeutics",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 11,
      "start_date": "2021-08-27",
      "completion_date": "2023-10-20",
      "has_results": false,
      "last_update_posted_date": "2023-12-27",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05438485"
    },
    {
      "nct_id": "NCT01402518",
      "title": "Per-Oral Endoscopic Myotomy",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Achalasia"
      ],
      "interventions": [
        {
          "name": "Per-oral enodscopic myotomy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "University of California, San Diego",
      "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": 100,
      "start_date": "2009-11",
      "completion_date": "2019-11",
      "has_results": false,
      "last_update_posted_date": "2020-03-10",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 1,
      "location_summary": "San Diego, California",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01402518"
    },
    {
      "nct_id": "NCT04414189",
      "title": "Clinical Validation of HostDx Sepsis™ on NanoString; a Prospective Observational Validation Trial",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Sepsis"
      ],
      "interventions": [
        {
          "name": "HostDx Sepsis",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Inflammatix",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 200,
      "start_date": "2020-06-07",
      "completion_date": "2021-10-19",
      "has_results": false,
      "last_update_posted_date": "2021-12-22",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 1,
      "location_summary": "Gainesville, Florida",
      "locations": [
        {
          "city": "Gainesville",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04414189"
    },
    {
      "nct_id": "NCT06084013",
      "title": "Use Of Indocyanine Green In Pancreas Surgery",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Pancreatic Carcinoma"
      ],
      "interventions": [
        {
          "name": "Non-Interventional Study",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "OHSU Knight 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": 55,
      "start_date": "2024-02-29",
      "completion_date": "2028-02-28",
      "has_results": false,
      "last_update_posted_date": "2026-08-31",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 1,
      "location_summary": "Portland, Oregon",
      "locations": [
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06084013"
    },
    {
      "nct_id": "NCT05869760",
      "title": "Baylor Infant and Toddler Biomarker of Nutrition Study",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Healthy Nutrition",
        "Healthy Diet"
      ],
      "interventions": [
        {
          "name": "Carotenoid Intake",
          "type": "OTHER"
        },
        {
          "name": "Serum carotenoid concentrations",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Baylor College of Medicine",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "3 Months",
        "maximum_age": "24 Months",
        "sex": "ALL",
        "summary": "3 Months to 24 Months"
      },
      "enrollment_count": 208,
      "start_date": "2023-06-26",
      "completion_date": "2028-11-30",
      "has_results": false,
      "last_update_posted_date": "2026-03-27",
      "last_synced_at": "2026-09-02T04:51:50.517Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05869760"
    }
  ]
}