Rare coagulation factor deficiencies

Rare coagulation factor deficiencies are disorders of the hemostatic system in which blood does not clot properly. The underlying cause is the absence, reduced concentration, or impaired function of specific proteins (clotting factors) responsible for clot formation.

Most cases are hereditary, meaning the condition is present from birth. However, acquired forms can also develop later in life, for instance, in the setting of liver disease or as a side effect of certain medications.

The most common examples include factor VII deficiency and fibrinogen disorders:

Afibrinogenemia — complete absence of fibrinogen, failing clot formation.

Hypofibrinogenemia — low fibrinogen levels, leading to prolonged bleeding.

Dysfibrinogenemia — abnormal fibrinogen quality, which may cause both bleeding and thrombosis.

Less frequently, deficiencies involve other factors (II, V, X, XI, XIII). For example, factor XIII deficiency in women is often associated with recurrent miscarriages due to defective placental attachment. Combined deficiencies, where several factors are simultaneously reduced, may also occur.

Clinical manifestations.

Patients typically experience prolonged nosebleeds and gum bleeding, easy bruising, and large hematomas after minor trauma. In children, joint bleeding is common, causing pain and restricted mobility. Surgical interventions and childbirth carry a particularly high risk of severe hemorrhage. In rare cases, thrombotic events may also develop.

Diagnosis.

Initial evaluation includes standard coagulation tests (PT, aPTT, fibrinogen level). If abnormalities are detected, activity levels of individual factors are measured. In suspected hereditary cases, genetic testing is performed to confirm the underlying defect.

Treatment.

The mainstay of therapy is replacement treatment — administration of the missing factor or protein. If a specific concentrate is not available, fresh frozen plasma or cryoprecipitate is used. For mucosal bleeding (e.g., after dental extraction), antifibrinolytic agents such as tranexamic acid are effective. In cases of vitamin K deficiency, vitamin K supplementation is indicated.