Factor XIII deficiency may occur very rarely, and can cause a severe bleeding tendency. Incidence is 1 in a million to 1 in 5 million people. Most are due to mutations in the A subunit. Administration of recombinant A subunit improves clot stability and is becoming a therapeutic option for patients with this condition. This deficiency leads to defective cross-linking of fibrin and vulnerability to late re-bleeds when the primary hemostatic plug is overwhelmed. Bleeding tendencies similar to hemophiliacs develop such as hemarthroses and deep tissue bleeding.
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