Congenital Factor XIII Deficiency: Observation of Two New Cases in the Newborn Period

We treated two cases of fibrin stabilizing factor (FSF) deficiency in the newborn period and an additional case at 6 months of age. The presenting symptom of all these patients was bleeding from the cord stump. The parents and a sibling of the first patient were shown to be heterozygotes by assays for this factor. The genetics of this factor deficiency appeared to be autosomal recessive in all. When cord stump bleeding occurs in the early newborn period, especially in babies who have received vitamin K, factor XIII deficiency should be remembered.

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