Factor V deficiency is a condition that is passed down through families which affects the ability of the blood to clot.

Parahemophilia; Owren's disease

Blood clotting is a complex process involving as many as 20 different proteins in blood plasma. These proteins are called blood coagulation factors.

Factor V deficiency is caused by a lack of the Factor V. When certain blood clotting factors are low or missing, your blood does not clot properly.

Factor V deficiency is rare. It may be caused by:

• A defective Factor V gene pass down through families (inherited)
• An antibody that interferes with normal Factor V function

You can may get an antibody that interferes with Factor V:

• After giving birth
• After being treated with a certain type of fibrin glue
• After surgery
• With autoimmune diseases and certain cancers

Sometimes the cause is unknown.

The disease is similar to hemophilia, except bleeding into joints is less common. In the inherited form of Factor V deficiency, a family history of a bleeding disorder is a risk factor.

• Bleeding into the skin
• Bleeding of the gums
• Excessive bruising
• Nosebleeds
• Prolonged or excessive loss of blood with surgery or trauma
• Umbilical stump bleeding

• Factor V assay
• Blood clotting tests, including partial thromboplastin time (PTT) and prothrombin time
• Bleeding time

You will be given fresh blood plasma or fresh frozen plasma infusions during a bleeding episode or after surgery. These treatments will correct the deficiency temporarily.

The outlook is good with diagnosis and proper treatment.

Severe bleeding (hemorrhage) could occur.

Go to the emergency room or call the local emergency number (such as 911) if you have an unexplained or prolonged loss of blood.

Ragni MV. Hemorrhagic disorders: coagulation factor deficiencies. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 167.