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Factor V deficiency
Definition
Factor V deficiency is an inherited condition that affects the ability of the blood to clot.
Alternative Names
Parahemophilia; Owren's diseaseCauses
Normal blood coagulation is a complex process involving as many as 20 different proteins in blood plasma, which are known as blood coagulation factors. A series of complex chemical reactions using these factors takes place very rapidly to form a protein called fibrin, which stops bleeding.
Factor V deficiency is caused by a lack of the plasma protein Factor V. When certain coagulation factors are low or missing, the chain reaction does not take place normally. Factor V is rare, and can be caused by inheriting a defective Factor V gene or by acquiring an antibody that interferes with normal Factor V function.
You can acquire an inhibitor of 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.
Excessive bleeding with menstrual periods and after delivery often occurs. Men and women are affected equally. About 1 person per 1 million has the disorder.
Symptoms
- Bleeding into the skin
- Bleeding of the gums
- Excessive bruising
- Excessive menstrual bleeding
- Nosebleeds
- Prolonged or excessive loss of blood with surgery or trauma
- Umbilical stump bleeding
Exams and Tests
- Factor V assay showing decreased activity
- Normal thrombin time
- Prolonged partial thromboplastin time
- Prolonged prothrombin time
- Slightly prolonged bleeding time (in some people)
Treatment
You should receive fresh blood plasma or fresh frozen plasma infusions during a bleeding episode or after surgery. These treatments will correct the deficiency temporarily.
Support Groups
You can often help the stress of illness by joining a support group where members share common experiences and problems.
Outlook (Prognosis)
The outlook is good with diagnosis and proper treatment.
Possible Complications
Severe bleeding (hemorrhage) could occur.
When to Contact a Medical Professional
Go to the emergency room or call the local emergency number (such as 911) if you have an unexplained or prolonged loss of blood.
Prevention
This is an inherited disorder; there is no known prevention.
References
Asselta R, Tenchini ML, Duga S. Inherited defects of coagulation Factor V: the hemorrhagic side. J Thromb Haemost. 2007;5:185-188.
Reviewed By: Stephen Grund, MD, PhD, Chief of Hem/One and Director of the George Bray Cancer Center at New Britain General Hospital, New Britain, CT. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
