Abstract
A 3-year-old girl had a deficiency in fibrin-stabilizing factor (factor XIII). Although approximately 18 cases of this disorder have been reported in the world literature, the present case is of interest for three reasons: (1) A factor XIII level of 1% to 2% was sufficient to correct the defect in the patient's plasma. (2) There was a history of intermarriage between relatives in the patient's family. (3) A partial deficiency of factor XIII was demonstrated in the patient's parents and in some of the other members of her family.

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