VTE Risk Score in Pregnancy Calculator

Understanding VTE Risk in Pregnancy and the Puerperium

Venous Thromboembolism (VTE), which includes deep vein thrombosis (DVT) and pulmonary embolism (PE), remains a leading direct cause of maternal morbidity and mortality. Pregnancy naturally increases clotting propensity due to venous stasis from gravid uterine compression, pelvic vessel dilation, and hepatic hypercoagulability.

The Royal College of Obstetricians and Gynaecologists (RCOG Green-top Guideline No. 37a) provides an evidence-based risk stratification model to determine whether pharmacological thromboprophylaxis with Low-Molecular-Weight Heparin (LMWH) is indicated.

RCOG Risk Stratification and Action Points

Key Clinical Scoring Factors

• Previous unprovoked or estrogen-related VTE: +4 points (high risk).
• Previous VTE provoked by major surgery: +3 points.
• High-risk thrombophilia: +3 points (e.g. Antithrombin III deficiency, Antiphospholipid antibodies).
• Medical comorbidities: +3 points (cancer, SLE, heart failure, IBD, sickle cell disease).
• Emergency Cesarean in labor: +2 points.
• BMI ≥ 30 kg/m², Maternal age ≥ 35, Parity ≥ 3, Smoking, PPH > 1L: +1 point each.

Explore other maternal health and risk assessment calculators on our platform, such as the VBAC Calculator for assessing vaginal birth success after previous cesarean, or the Gestational Age Calculator.