Successful childbirth by a patient with congenital factor XI deficiency and an acquired inhibitor

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Abstract
Acquired inhibitors in factor XI deficiency (FXI) are rare. The presence of an inhibitor during pregnancy poses a potential haemorrhagic risk to the fetus. We report an uncomplicated pregnancy and successful childbirth by a woman with congenital FXI deficiency and an acquired inhibitor, and discuss the persistence of residual FXI activity in the presence of an inhibitor.