{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=COVID-19+serology+IgG",
    "query": {
      "intervention": "COVID-19 serology IgG"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 5,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-10-06T00:58:37.174Z",
  "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": "NCT04944095",
      "title": "Change in Antibody Levels Following SARS-CoV-2 (Covid-19) Vaccinations",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Covid-19",
        "Subjects Vaccinated Against Covid-19"
      ],
      "interventions": [
        {
          "name": "Change in SARS-CoV-2 Antibody Levels",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Dr. Sidney J. Stohs",
      "sponsor_class": "OTHER",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "55 Years and older"
      },
      "enrollment_count": 10000,
      "start_date": "2021-08-10",
      "completion_date": "2024-12-31",
      "has_results": false,
      "last_update_posted_date": "2022-08-29",
      "last_synced_at": "2026-10-06T00:58:37.174Z",
      "location_count": 1,
      "location_summary": "Southlake, Texas",
      "locations": [
        {
          "city": "Southlake",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04944095"
    },
    {
      "nct_id": "NCT04424004",
      "title": "MURDOCK Cabarrus County COVID-19 Prevalence and Immunity (C3PI) Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "COVID 19"
      ],
      "interventions": [
        {
          "name": "COVID-19 PCR and serology testing",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Duke University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 300,
      "start_date": "2020-06-09",
      "completion_date": "2021-12-02",
      "has_results": false,
      "last_update_posted_date": "2022-02-04",
      "last_synced_at": "2026-10-06T00:58:37.174Z",
      "location_count": 1,
      "location_summary": "Kannapolis, North Carolina",
      "locations": [
        {
          "city": "Kannapolis",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04424004"
    },
    {
      "nct_id": "NCT04432272",
      "title": "ANTIBODY-LEVEL BASED ANALYSIS OF COVID-19 CONVALESCENT SERUM (ABACCuS)",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "COVID-19",
        "Severe Acute Respiratory Syndrome (SARS)",
        "Coronavirus Infections"
      ],
      "interventions": [
        {
          "name": "COVID-19 convalescent plasma",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Corewell Health East",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 71,
      "start_date": "2020-07-16",
      "completion_date": "2020-11-28",
      "has_results": true,
      "last_update_posted_date": "2022-03-09",
      "last_synced_at": "2026-10-06T00:58:37.174Z",
      "location_count": 1,
      "location_summary": "Royal Oak, Michigan",
      "locations": [
        {
          "city": "Royal Oak",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04432272"
    },
    {
      "nct_id": "NCT04723706",
      "title": "Response to SARS-CoV-2 Vaccine in Stem Cell Transplant and Cellular Therapy Patients",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hematologic Disorders and Bone Marrow Failure, Hematopoietic Stem Cell Transplantation (HSCT) or Cellular Therapy (CART)"
      ],
      "interventions": [
        {
          "name": "COVID-19 serology IgG",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Henry Ford Health System",
      "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": 33,
      "start_date": "2021-03-19",
      "completion_date": "2024-01-02",
      "has_results": false,
      "last_update_posted_date": "2024-04-23",
      "last_synced_at": "2026-10-06T00:58:37.174Z",
      "location_count": 1,
      "location_summary": "Detroit, Michigan",
      "locations": [
        {
          "city": "Detroit",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04723706"
    },
    {
      "nct_id": "NCT04736524",
      "title": "Immune Response Following COVID-19 Vaccination",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "IgM and IgG in Blood"
      ],
      "interventions": [
        {
          "name": "Rapid antibody test",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Texas Cardiac Arrhythmia Research Foundation",
      "sponsor_class": "OTHER",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "16 Years to 85 Years"
      },
      "enrollment_count": 500,
      "start_date": "2021-01-15",
      "completion_date": "2022-03",
      "has_results": false,
      "last_update_posted_date": "2021-02-03",
      "last_synced_at": "2026-10-06T00:58:37.174Z",
      "location_count": 1,
      "location_summary": "Austin, Texas",
      "locations": [
        {
          "city": "Austin",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04736524"
    }
  ]
}