{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Transvaginal+ultrasound+cervical+length",
    "query": {
      "intervention": "Transvaginal ultrasound cervical length"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 9,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-10-08T15:28:51.352Z",
  "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": "NCT00371046",
      "title": "Does Fetal Fibronectin and Ultrasound Cervical Length Help in the Evaluation of Women With Suspected Preterm Labor?",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Preterm Birth"
      ],
      "interventions": [
        {
          "name": "Transvaginal ultrasound cervical length",
          "type": "PROCEDURE"
        },
        {
          "name": "Cervicovaginal fetal fibronectin",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Thomas Jefferson University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 100,
      "start_date": "2003-10",
      "completion_date": "2006-12",
      "has_results": false,
      "last_update_posted_date": "2007-03-02",
      "last_synced_at": "2026-10-08T15:28:51.352Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00371046"
    },
    {
      "nct_id": "NCT04301518",
      "title": "Prematurity Risk Assessment Combined With Clinical Interventions for Improving Neonatal outcoMEs",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Preterm Labor",
        "Preterm Birth"
      ],
      "interventions": [
        {
          "name": "Multimodal intervention strategy",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Sera Prognostics, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 6500,
      "start_date": "2020-11-06",
      "completion_date": "2026-12-30",
      "has_results": false,
      "last_update_posted_date": "2024-12-06",
      "last_synced_at": "2026-10-08T15:28:51.352Z",
      "location_count": 18,
      "location_summary": "San Diego, California • New Haven, Connecticut • Newark, Delaware + 15 more",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        },
        {
          "city": "Newark",
          "state": "Delaware"
        },
        {
          "city": "Panama City",
          "state": "Florida"
        },
        {
          "city": "Lexington",
          "state": "Kentucky"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04301518"
    },
    {
      "nct_id": "NCT01431885",
      "title": "Two Methods of Diagnosing Preterm Labor",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Preterm Labor",
        "Preterm Delivery"
      ],
      "interventions": [
        {
          "name": "Diagnosis by cervical length and fibronectin",
          "type": "PROCEDURE"
        },
        {
          "name": "Cervical change",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "16 Years and older · Female only"
      },
      "enrollment_count": 82,
      "start_date": "2011-08",
      "completion_date": "2015-02-13",
      "has_results": false,
      "last_update_posted_date": "2020-01-18",
      "last_synced_at": "2026-10-08T15:28:51.352Z",
      "location_count": 1,
      "location_summary": "Fresno, California",
      "locations": [
        {
          "city": "Fresno",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01431885"
    },
    {
      "nct_id": "NCT05246579",
      "title": "Prospective Evaluation of Pathways for Preterm Birth",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Preterm Birth",
        "Cervix; Pregnancy"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "John O'Brien, MD",
      "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": 240,
      "start_date": "2022-02-04",
      "completion_date": "2027-07-01",
      "has_results": false,
      "last_update_posted_date": "2026-08-04",
      "last_synced_at": "2026-10-08T15:28:51.352Z",
      "location_count": 1,
      "location_summary": "Lexington, Kentucky",
      "locations": [
        {
          "city": "Lexington",
          "state": "Kentucky"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05246579"
    },
    {
      "nct_id": "NCT01955148",
      "title": "fFN Clinical Evaluation in Asymptomatic Women at High Risk for Preterm Birth",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Pre-term Birth"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Hologic, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 65 Years · Female only"
      },
      "enrollment_count": 1210,
      "start_date": "2013-10",
      "completion_date": "2016-09",
      "has_results": false,
      "last_update_posted_date": "2015-08-26",
      "last_synced_at": "2026-10-08T15:28:51.352Z",
      "location_count": 16,
      "location_summary": "Birmingham, Alabama • San Diego, California • Newark, Delaware + 13 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Newark",
          "state": "Delaware"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Springfield",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01955148"
    },
    {
      "nct_id": "NCT03251729",
      "title": "Cerclage On LOw Risk Singletons: Cervical Cerclage for Prevention of Spontaneous Preterm Birth in Low Risk Singleton Pregnancies With Short Cervix",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Premature Birth"
      ],
      "interventions": [
        {
          "name": "Cervical cerclage",
          "type": "PROCEDURE"
        },
        {
          "name": "Vaginal progesterone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "DRUG"
      ],
      "sponsor": "Thomas Jefferson University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 50 Years · Female only"
      },
      "enrollment_count": 93,
      "start_date": "2017-09-22",
      "completion_date": "2024-02-20",
      "has_results": false,
      "last_update_posted_date": "2024-04-19",
      "last_synced_at": "2026-10-08T15:28:51.352Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03251729"
    },
    {
      "nct_id": "NCT01482039",
      "title": "Patient Attitudes Toward Ultrasound Measurement of Cervical Length",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cervical Insufficiency"
      ],
      "interventions": [
        {
          "name": "Sequential ultrasound",
          "type": "PROCEDURE"
        },
        {
          "name": "Transvaginal ultrasound",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Intermountain Women and Children's Research",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 210,
      "start_date": "2011-11",
      "completion_date": "2012-12",
      "has_results": false,
      "last_update_posted_date": "2011-11-30",
      "last_synced_at": "2026-10-08T15:28:51.352Z",
      "location_count": 1,
      "location_summary": "Salt Lake City, Utah",
      "locations": [
        {
          "city": "Salt Lake City",
          "state": "Utah"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01482039"
    },
    {
      "nct_id": "NCT03340688",
      "title": "Cerclage for Twins With Short Cervical Length ≤ 15mm",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Twin Pregnancy With Antenatal Problem",
        "Preterm Birth",
        "Short Cervix"
      ],
      "interventions": [
        {
          "name": "Cervical cerclage",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Thomas Jefferson University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 60 Years · Female only"
      },
      "enrollment_count": 200,
      "start_date": "2017-06-22",
      "completion_date": "2025-06",
      "has_results": false,
      "last_update_posted_date": "2020-04-27",
      "last_synced_at": "2026-10-08T15:28:51.352Z",
      "location_count": 3,
      "location_summary": "Washington D.C., District of Columbia • Philadelphia, Pennsylvania • Austin, Texas",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Austin",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03340688"
    },
    {
      "nct_id": "NCT06822647",
      "title": "Optimal Timing of Routine Cervical Length Measurements During Anatomy Survey",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cervical Insufficiency",
        "Preterm Birth",
        "Cervical Length Measurement"
      ],
      "interventions": [
        {
          "name": "Cervical Length Measurement at the Beginning of the Anatomy Survey",
          "type": "PROCEDURE"
        },
        {
          "name": "Cervical Length Measurement at the End of the Anatomy Survey",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Henry Ford Health System",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 550,
      "start_date": "2025-01-20",
      "completion_date": "2027-07-01",
      "has_results": false,
      "last_update_posted_date": "2026-03-09",
      "last_synced_at": "2026-10-08T15:28:51.352Z",
      "location_count": 1,
      "location_summary": "Detroit, Michigan",
      "locations": [
        {
          "city": "Detroit",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06822647"
    }
  ]
}