Determining blood clotting reference values for pregnant women

Thrombophilia Assessment and Pregnancy: Determination of Reference Values for dRVVT in Pregnant Women

Observational Hospices Civils de Lyon · NCT06133621

This study is trying to find out the normal blood clotting levels for pregnant women to help manage their risk of blood clots during pregnancy.

Quick facts

Study typeObservational
Enrollment100 (estimated)
Ages18 Years to 50 Years
SexFemale
SponsorHospices Civils de Lyon Academic / other
Locations1 site (Lyon)
Trial IDNCT06133621 on ClinicalTrials.gov

What this trial studies

This observational study aims to establish reference values for the diluted Russell's viper venom time (dRVVT) specifically in pregnant women. It focuses on understanding the changes in haemostasis during pregnancy, which can lead to a hypercoagulable state and increase the risk of thromboembolic events. The study will involve monitoring pregnant women with normal pregnancies and those with elevated dRVVT ratios to assess the implications for vascular diseases of pregnancy. The findings could help improve the management of pregnant women at risk for complications related to blood clotting.

Who should consider this trial

Good fit: Ideal candidates include pregnant women with normal pregnancies and those with increased dRVVT ratios being monitored for vascular diseases of pregnancy.

Not a fit: Patients with a history of thromboembolic disease, autoimmune disease, or vascular diseases of pregnancy may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could enhance the understanding and management of thromboembolic risks in pregnant women, potentially improving maternal and fetal outcomes.

How similar studies have performed: While this approach is focused on a specific population, similar studies have shown the importance of monitoring coagulation parameters in pregnancy, suggesting potential for success.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

Control group :

* patients with normal pregnancies at the HCL.
* Affiliation to a social security regime

Case group :

* Patients followed at the HCL who had an increased dRVVT ratio during pregnancy, investigated as part of the development of VDP during pregnancy.
* Affiliation to a social security regime

Exclusion Criteria:

* History of thromboembolic disease
* History of autoimmune disease
* History of VDP

Where this trial is running

Lyon

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions Normal PregnancyPregnancyThrombophiliaAntiphospholipid syndromeVascular diseases of pregnancyDiluted Russell viper venom time
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.