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Article History

Received: 2 November 2023

Accepted: 26 May 2025

First Online: 4 June 2025

Declarations

:

: The study adhered to the Declaration of Helsinki and was approved by the University of Sheffield Research Ethics Committee (University of Sheffield 038511) in March 2021. All participants gave written informed consent and provided consent for the publication of anonymised quotations.

: All participants signed a consent form giving permission for anonymised quotations to be used in publications and research outputs.

: All authors have completed the ICMJE uniform disclosure form at http://www.icmje.org/disclosure-of-interest/ and declare: the research described was conducted as part of a wider project funded by theNational Institute for Health Research Health Technology Assessment (NIHR HTA) programme(project number NIHR131021); S Goodacre is chair of the NIHR HTA Clinical Trials Unit StandingAdvisory Committee, is a member of the NIHR HTA Programme Oversight Committee 2009 - 2023and has been a member of a number of NIHR Committees from 2009 to 2022; BJ Hunt, waspreviously involved in developing relevant National Institute for Health and Care Excellence (NICE)guidance on prevention and management of venous thromboembolic disease, and founder and atrustee of Thrombosis UK and previous Chair of the Steering Group of World Thrombosis Day; CNelson-Piercy reports personal fees from Sanofi and UCB, and was the lead developer of the RoyalCollege of Obstetricians and Gynaecologists (RCOG) Green Top Guideline on thromboprophylaxis inpregnancy (37a); J Daru was an author on RCOG’s Covid-19 guidance; no other relationships oractivities that could appear to have influenced the submitted work.

: All work funded by the NIHR is subject to Crown Copyright. We are therefore unable to assign copyright to the journal but will grant a non-exclusive licence (CC-BY) on a worldwide basis to permit this article (if accepted) to be published in BMC Pregnancy and Childcare.