Synopsis: The risk of recurrent antepartum venous thromboembolism in women with a history of venous thromboembolism is low and therefore routine antepartum prophylaxis with heparin is not warranted.
Source: Edwards P et al. Safety of withholding heparin in pregnant women with a history of venous thromboembolism. N Engl J Med. 2000;343:1439–1444.