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Pregnancy or preconception advice Warfarin or DOACs

Please note the two referral routes depending on whether the woman is pregnant or planning to conceive.

For pregnant women, this advice refers to those needing ongoing anticoagulation: warfarin & VKAs, low molecular weight heparin, fondaparinux, direct oral anticoagulants (DOACs).

  • Pregnant: see below – requires urgent or semi-urgent referral. Please note that the haematology on call consultant should be phoned for advice about pregnant women on oral anticoagulants as outlined below.
  • Preconception: patients should be referred to the Department of Haematology at RIE or SJH for counselling. For patients on long-term warfarin or other anticoagulants, please seek initial advice from the clinician managing the patient’s underlying condition, but also refer to the haematology clinic.

C.M & L.W 27-03-24

Who to refer:

URGENT: Pregnant and on warfarin, VKA or direct oral anticoagulant (DOAC):

SEMI-URGENT: Pregnant and on therapeutic low molecular weight heparin or fondaparinux – please send urgent referral to haematology / obstetric clinic in RIE or SJH

How to refer:

Preconception: via Sci Gateway to Department of Haematology at RIE or SJH

Pregnant and on warfarin, VKA or DOAC:

Pregnant and on therapeutic LMWH or fondaparinux: send letter to Department of Haematology RIE or SJH.

​Primary care investigations

  • Clinical history and documentation of results  of imaging are most important