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THROMBOPROPHYLAXIS IN PREGNANCY – Appendix 1, Risk factors
Last updated 16th February 2022
Risk factors and scoring system
- If total score ≥ 4 antenatally, consider thromboprophylaxis from the first trimester.
- If total score 3 antenatally, consider thromboprophylaxis from 28 weeks.
- If total score ≥ 2 postnatally, consider thromboprophylaxis for at least 10 days.
- If admitted to hospital, antenatally or postnatally, with an illness (other than bleeding issues including severe uncontrolled hypertension), it is usually appropriate to give thromboprophylaxis (during the admission), unless the woman is in labour / suspected labour or being delivered imminently.
For patients with an identified bleeding disorder, the balance of risks of bleeding and thrombosis should be discussed in consultation with a haematologist with expertise in thrombosis and bleeding in pregnancy.
Risk factors for VTE
Abbreviations: ART assisted reproductive technology; IVF in vitro fertilization; OHSS ovarian hyperstimulation syndrome; VTE venous thromboembolism