{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Blood+samples+collected&page=5",
    "query": {
      "intervention": "Blood samples collected",
      "page": 5
    },
    "page_size": 10
  },
  "pagination": {
    "page": 5,
    "page_size": 10,
    "total_count": 4242,
    "total_pages": 425,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Blood+samples+collected&page=6&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Blood+samples+collected&page=4&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-02T08:24:24.755Z",
  "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": "NCT04151953",
      "title": "Myocardial Injury in Patients With Cardiac Implantable Electronic Devices Following Magnetic Resonance Imaging",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Magnetic Resonance Imaging (MRI)"
      ],
      "interventions": [
        {
          "name": "Blood sample collection",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 105,
      "start_date": "2019-10-08",
      "completion_date": "2021-12-01",
      "has_results": false,
      "last_update_posted_date": "2022-01-05",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 1,
      "location_summary": "Rochester, Minnesota",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04151953"
    },
    {
      "nct_id": "NCT01326728",
      "title": "Relapsed Malignant Blood Cancer After Allogeneic Hematopoietic Stem Cell Transplantation",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Chronic Myelogenous Leukemia",
        "Acute Myelogenous Leukemia",
        "Acute Lymphoblastic Leukemia",
        "Hodgkins Lymphoma",
        "Non-Hodgkins Lymphoma"
      ],
      "interventions": [
        {
          "name": "Allogeneic stem cell transplant",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "National Cancer Institute (NCI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "99 Years",
        "sex": "ALL",
        "summary": "18 Years to 99 Years"
      },
      "enrollment_count": 56,
      "start_date": "2011-03-30",
      "completion_date": "2017-07-14",
      "has_results": true,
      "last_update_posted_date": "2018-06-06",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01326728"
    },
    {
      "nct_id": "NCT00316836",
      "title": "Breast Density, Hormone Levels, and Anticancer Drug Levels in Women With Invasive Breast Cancer Who Are Receiving Exemestane or Anastrozole",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "mammography",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Alliance for Clinical Trials in Oncology",
      "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": 554,
      "start_date": "2006-04",
      "completion_date": "2012-02",
      "has_results": false,
      "last_update_posted_date": "2019-01-24",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 311,
      "location_summary": "Fairbanks, Alaska • Scottsdale, Arizona • Fort Smith, Arkansas + 222 more",
      "locations": [
        {
          "city": "Fairbanks",
          "state": "Alaska"
        },
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Fort Smith",
          "state": "Arkansas"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Berkeley",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00316836"
    },
    {
      "nct_id": "NCT05434845",
      "title": "The Effect of Blood on the PC Ratio During Pregnancy",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Proteinuria in Pregnancy"
      ],
      "interventions": [
        {
          "name": "Blood draw",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Marshall University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 45 Years · Female only"
      },
      "enrollment_count": 20,
      "start_date": "2022-06-19",
      "completion_date": "2022-12-19",
      "has_results": false,
      "last_update_posted_date": "2022-09-08",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 1,
      "location_summary": "Huntington, West Virginia",
      "locations": [
        {
          "city": "Huntington",
          "state": "West Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05434845"
    },
    {
      "nct_id": "NCT01135875",
      "title": "Laboratory Study of Early Tumor Markers in the Peripheral Blood of Glioblastoma Multiforme Patients",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Glioblastoma Multiforme",
        "Healthy Volunteers"
      ],
      "interventions": [
        {
          "name": "GBM Patients",
          "type": "OTHER"
        },
        {
          "name": "Normal Controls",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Florida",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "89 Years",
        "sex": "ALL",
        "summary": "18 Years to 89 Years"
      },
      "enrollment_count": 130,
      "start_date": "2009-10",
      "completion_date": "2013-04",
      "has_results": false,
      "last_update_posted_date": "2013-10-17",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 1,
      "location_summary": "Gainesville, Florida",
      "locations": [
        {
          "city": "Gainesville",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01135875"
    },
    {
      "nct_id": "NCT01364571",
      "title": "Evaluation of a Single Vaccination With One of Three Ascending Dose Levels of a 4-Antigen Staphylococcus Aureus Vaccine (SA4Ag) in Healthy Adults Aged 18 to <65 Years",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Staphylococcal Infections"
      ],
      "interventions": [
        {
          "name": "SA4Ag vaccine low dose",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Blood draw",
          "type": "PROCEDURE"
        },
        {
          "name": "Colonization swab sample",
          "type": "PROCEDURE"
        },
        {
          "name": "SA4Ag vaccine mid dose",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Blood sample",
          "type": "PROCEDURE"
        },
        {
          "name": "SA4Ag vaccine high dose",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "PROCEDURE"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "18 Years to 64 Years"
      },
      "enrollment_count": 456,
      "start_date": "2011-08",
      "completion_date": "2013-01",
      "has_results": false,
      "last_update_posted_date": "2019-03-04",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 16,
      "location_summary": "Hollywood, Florida • South Miami, Florida • Overland Park, Kansas + 10 more",
      "locations": [
        {
          "city": "Hollywood",
          "state": "Florida"
        },
        {
          "city": "South Miami",
          "state": "Florida"
        },
        {
          "city": "Overland Park",
          "state": "Kansas"
        },
        {
          "city": "Bardstown",
          "state": "Kentucky"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01364571"
    },
    {
      "nct_id": "NCT03567044",
      "title": "Immune Effects in Patients Treated With Whole Breast Irradiation",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Blood Draw",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "University of Virginia",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "45 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "45 Years and older · Female only"
      },
      "enrollment_count": 50,
      "start_date": "2018-10-01",
      "completion_date": "2020-03",
      "has_results": false,
      "last_update_posted_date": "2018-06-25",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 1,
      "location_summary": "Charlottesville, Virginia",
      "locations": [
        {
          "city": "Charlottesville",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03567044"
    },
    {
      "nct_id": "NCT06390839",
      "title": "Testing Palbociclib (PD-0332991) as Potentially Targeting Treatment in Cancers With CDK4 or CDK6 Amplification (MATCH - Subprotocol Z1C)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Advanced Lymphoma",
        "Advanced Malignant Solid Neoplasm",
        "Refractory Lymphoma",
        "Refractory Malignant Solid Neoplasm"
      ],
      "interventions": [
        {
          "name": "Biopsy Procedure",
          "type": "PROCEDURE"
        },
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Palbociclib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "DRUG"
      ],
      "sponsor": "National Cancer Institute (NCI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 43,
      "start_date": "2017-03-22",
      "completion_date": "2027-01-15",
      "has_results": true,
      "last_update_posted_date": "2026-07-17",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06390839"
    },
    {
      "nct_id": "NCT01385839",
      "title": "Efficacy of Hair Transplantation Compared With Hypodermic Needle Irritation in Alopecia Areata",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Alopecia Areata",
        "Alopecia",
        "Balding"
      ],
      "interventions": [
        {
          "name": "Hair transplantation",
          "type": "PROCEDURE"
        },
        {
          "name": "Hypodermic needle irritation",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Icahn School of Medicine at Mount Sinai",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 4,
      "start_date": "2009-10",
      "completion_date": "2012-05",
      "has_results": false,
      "last_update_posted_date": "2016-12-22",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01385839"
    },
    {
      "nct_id": "NCT05074875",
      "title": "COVID-19 Respiratory Outcomes Registry",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Covid19"
      ],
      "interventions": [
        {
          "name": "Questionnaires and Patient Reported Outcomes (PROs)",
          "type": "OTHER"
        },
        {
          "name": "Nasal Swab COVID-19 reverse transcription polymerase chain reaction test (RT-PCR)",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Blood Samples for Biomarkers",
          "type": "GENETIC"
        },
        {
          "name": "High Resolution Computed Tomography",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Physical Exam and Vital Signs",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Medical Research Council Sum Score",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Hand Grip Strength",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Spirometry",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Diffusing Capacity of Carbon Monoxide",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "6 Minute Walk Test",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Sit to Stand (STS) Measurement",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DIAGNOSTIC_TEST",
        "GENETIC"
      ],
      "sponsor": "Weill Medical College of Cornell University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 37,
      "start_date": "2021-01-15",
      "completion_date": "2023-05-09",
      "has_results": false,
      "last_update_posted_date": "2023-07-27",
      "last_synced_at": "2026-10-02T08:24:24.755Z",
      "location_count": 4,
      "location_summary": "St Louis, Missouri • New York, New York • Houston, Texas",
      "locations": [
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05074875"
    }
  ]
}