Congenital Fibrinogen Deficiency
What is Congenital Fibrinogen Deficiency?
Congenital fibrinogen deficiency is a rare genetic bleeding disorder that affects blood clotting. People with this condition have low levels of fibrinogen, a protein that helps form blood clots. Without enough fibrinogen, the blood cannot clot properly when you get injured.
There are two main types of this condition. Afibrinogenemia means you have almost no fibrinogen in your blood. Hypofibrinogenemia means you have some fibrinogen, but not enough for normal clotting. Both types are inherited from parents who carry the genetic mutation.
This disorder affects about 1 in 1 million people worldwide. Because fibrinogen plays a key role in stopping bleeding, people with this condition may experience unusual bleeding episodes. Severity varies based on how much fibrinogen is present in the blood.
Symptoms
- Bleeding from the umbilical cord stump at birth
- Easy bruising that appears without obvious injury
- Frequent nosebleeds that are hard to stop
- Bleeding gums, especially after dental work
- Heavy menstrual periods in women
- Prolonged bleeding after cuts, surgery, or injury
- Bleeding into joints, causing pain and swelling
- Internal bleeding in severe cases
- Blood in urine or stool
Some people with mild hypofibrinogenemia may have few symptoms. They might only notice bleeding problems during surgery or after significant injury. Afibrinogenemia usually causes more severe bleeding from early childhood.
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Causes and risk factors
Congenital fibrinogen deficiency is caused by mutations in genes that control fibrinogen production. These genes include FGA, FGB, and FGG. The condition is inherited in an autosomal recessive pattern. This means you must inherit one mutated gene from each parent to develop the disorder.
Parents who each carry one mutated gene usually have normal fibrinogen levels themselves. They are called carriers. When both parents are carriers, each child has a 25% chance of having the condition. There are no lifestyle or environmental factors that cause congenital fibrinogen deficiency, as it is purely genetic.
How it's diagnosed
Doctors diagnose congenital fibrinogen deficiency through blood tests that measure fibrinogen levels. The Clauss fibrinogen assay is the standard test used to check how much functional fibrinogen is in your blood. Low fibrinogen levels on this test suggest the condition. Additional clotting tests help doctors understand how well your blood forms clots.
Rite Aid offers fibrinogen testing through the Clauss method as an add-on to our preventive health panel. If you have a family history of bleeding disorders or unexplained bleeding, testing can provide important answers. Genetic testing can confirm the specific mutation and help with family planning decisions.
Treatment options
- Fibrinogen replacement therapy during bleeding episodes or before surgery
- Cryoprecipitate infusions to provide concentrated fibrinogen
- Fresh frozen plasma for mild bleeding or when other treatments are unavailable
- Avoiding medications that affect clotting, such as aspirin and ibuprofen
- Wearing medical alert jewelry to inform emergency responders
- Regular monitoring of fibrinogen levels with blood tests
- Working with a hematologist who specializes in bleeding disorders
- Preventive treatment before dental procedures or planned surgeries
- Genetic counseling for family planning
Need testing for Congenital Fibrinogen Deficiency? Add it to your panel.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Afibrinogenemia means you have almost no fibrinogen in your blood, usually less than 10 mg/dL. Hypofibrinogenemia means you have low fibrinogen levels, typically between 20 and 80 mg/dL. Afibrinogenemia tends to cause more severe bleeding problems, while hypofibrinogenemia symptoms can range from mild to moderate.
This condition follows an autosomal recessive inheritance pattern. You need to inherit one mutated gene from each parent to develop the disorder. If both parents are carriers, each pregnancy has a 25% chance of producing a child with the condition and a 50% chance of producing a carrier.
There is currently no cure for congenital fibrinogen deficiency because it is a genetic condition. Treatment focuses on preventing and managing bleeding episodes through fibrinogen replacement therapy. With proper medical care and monitoring, most people with this condition can live normal lives.
Normal fibrinogen levels range from 200 to 400 mg/dL in most healthy adults. People with hypofibrinogenemia have levels below 100 mg/dL. Those with afibrinogenemia have levels below 10 mg/dL or completely absent fibrinogen.
No, these are different bleeding disorders affecting different clotting factors. Congenital fibrinogen deficiency involves low fibrinogen levels. Hemophilia involves deficiencies in clotting factors VIII or IX. Both cause abnormal bleeding but require different treatments and have different inheritance patterns.
Pregnancy in women with congenital fibrinogen deficiency requires careful monitoring by specialists. Fibrinogen levels often need to be maintained above 50 mg/dL during pregnancy and above 100 mg/dL during delivery. With proper treatment and monitoring, many women can have successful pregnancies.
Testing frequency depends on your symptoms and treatment plan. Your hematologist will recommend a schedule based on your specific needs. Regular monitoring helps track your baseline levels and detect any changes that might require treatment adjustments.
Avoid medications that interfere with blood clotting, including aspirin, ibuprofen, and other nonsteroidal anti-inflammatory drugs. Contact sports and activities with high injury risk should be approached cautiously. Always inform doctors, dentists, and surgeons about your condition before any procedure.
No, diet and supplements cannot increase fibrinogen levels in people with congenital fibrinogen deficiency. The condition is caused by genetic mutations that prevent proper fibrinogen production. Only fibrinogen replacement therapy can temporarily raise levels when needed.
Untreated congenital fibrinogen deficiency can lead to severe bleeding complications, including internal bleeding and bleeding into joints. Joint bleeding can cause long-term damage and mobility problems. Some people develop blood clots paradoxically, though bleeding is more common. Proper treatment and monitoring help prevent these complications.