Fibrinogen Deficiency (Hypofibrinogenemia or Afibrinogenemia)
What is Fibrinogen Deficiency (Hypofibrinogenemia or Afibrinogenemia)?
Fibrinogen deficiency is a rare genetic bleeding disorder that affects your blood's ability to clot properly. Fibrinogen is a protein made by your liver that helps form blood clots when you're injured. Without enough fibrinogen, your blood can't clot the way it should.
There are two main types of this condition. Hypofibrinogenemia means your body makes some fibrinogen, but not enough. Afibrinogenemia is more severe and means your body makes little to no fibrinogen at all. Both conditions are inherited from your parents through genes.
These disorders are extremely rare. Afibrinogenemia affects about 1 in 1 million people worldwide. Hypofibrinogenemia is slightly more common but still very unusual. Because fibrinogen plays a critical role in blood clotting, people with these conditions may experience bleeding problems ranging from mild to severe.
Symptoms
- Easy bruising or bruising without a clear cause
- Frequent nosebleeds that are hard to stop
- Heavy or prolonged bleeding from cuts or injuries
- Heavy menstrual periods in women
- Bleeding in the mouth or gums, especially after dental work
- Bleeding into joints, causing pain and swelling
- Bleeding in the umbilical cord stump in newborns
- Blood in urine or stool
- Prolonged bleeding after surgery or procedures
- In severe cases, bleeding in the brain or internal organs
Some people with mild hypofibrinogenemia may have few symptoms until they have surgery or a major injury. The severity of symptoms often depends on how much fibrinogen your body produces. People with afibrinogenemia usually have more serious bleeding problems from early childhood.
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Causes and risk factors
Fibrinogen deficiency is caused by mutations in genes that tell your body how to make fibrinogen. The most common genes involved are FGA, FGB, and FGG. These genetic changes are inherited from your parents in an autosomal recessive pattern. This means you need to inherit a changed gene from both parents to develop the condition.
If you inherit one changed gene, you're a carrier but typically won't have symptoms. When both parents are carriers, each child has a 25% chance of having the condition. There are no lifestyle or environmental risk factors that cause fibrinogen deficiency. It's purely genetic and present from birth, though symptoms may not appear until later in life depending on severity.
How it's diagnosed
Doctors diagnose fibrinogen deficiency through blood tests that measure clotting function and fibrinogen levels. A fibrinogen activity test measures how well your fibrinogen helps blood clot. A fibrinogen antigen test measures the total amount of fibrinogen protein in your blood. Other tests like PT and aPTT check overall clotting time and may show abnormal results.
Rite Aid offers fibrinogen activity testing as an add-on to help identify potential clotting disorders. If initial screening suggests a problem, genetic testing can confirm the specific mutation causing the condition. Early diagnosis is important for preventing serious bleeding complications and planning medical care. Your doctor will consider your symptoms, family history, and test results together to make a diagnosis.
Treatment options
- Fibrinogen replacement therapy with cryoprecipitate or fibrinogen concentrate during bleeding episodes
- Preventive fibrinogen infusions before surgery or dental procedures
- Avoiding medications that affect clotting, like aspirin and NSAIDs
- Wearing medical alert jewelry to inform emergency responders
- Using caution with activities that could cause injury
- Antifibrinolytic medications like tranexamic acid to help stabilize clots
- Hormone therapy for women with heavy menstrual bleeding
- Regular monitoring with a hematologist who specializes in bleeding disorders
- Education about recognizing serious bleeding and when to seek emergency care
- Genetic counseling for family planning decisions
Need testing for Fibrinogen Deficiency (Hypofibrinogenemia or Afibrinogenemia)? 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
Hypofibrinogenemia means your body produces some fibrinogen, but levels are lower than normal. Afibrinogenemia is more severe and means your body produces little to no fibrinogen at all. People with afibrinogenemia typically have more serious bleeding problems. Both conditions are genetic and affect blood clotting, but afibrinogenemia requires more intensive medical management.
Fibrinogen deficiency is inherited in an autosomal recessive pattern. This means you must inherit a changed gene from both parents to have the condition. If both parents are carriers, each child has a 25% chance of having the disorder and a 50% chance of being a carrier. Carriers typically don't have symptoms but can pass the gene to their children.
Yes, fibrinogen deficiency can be detected at birth, especially in severe cases. Newborns with afibrinogenemia may have bleeding from the umbilical cord stump. Some babies are diagnosed through newborn screening if they have a family history. However, mild cases of hypofibrinogenemia may not be detected until later in life when bleeding problems occur.
Fibrinogen deficiency can be life threatening if not properly managed, especially in severe cases. Serious bleeding in the brain or internal organs can be fatal. However, with proper medical care and fibrinogen replacement therapy, most people with this condition can live relatively normal lives. Regular monitoring and knowing when to seek treatment are essential for safety.
Contact your doctor or go to the emergency room immediately if you experience serious bleeding. This includes bleeding that won't stop, bleeding into joints, severe headaches that may signal brain bleeding, or blood in urine or stool. You may need fibrinogen replacement therapy through an infusion. Always keep your medical team informed about your condition and wear medical alert identification.
Yes, but pregnancy requires careful planning and monitoring with a high-risk obstetrician and hematologist. Women with fibrinogen deficiency face increased bleeding risks during pregnancy and delivery. They may need fibrinogen replacement therapy during labor and after delivery. Regular monitoring throughout pregnancy helps ensure the safety of both mother and baby.
Avoid contact sports and activities with high injury risk, such as football, hockey, or martial arts. Be cautious with activities like skiing or rock climbing that could cause serious falls. You don't need to avoid all physical activity, but choose safer options like swimming, walking, or cycling. Always discuss activity choices with your hematologist to understand your specific risks.
Testing frequency depends on your condition severity and treatment plan. Your hematologist may check fibrinogen levels regularly, especially before procedures or if you're receiving replacement therapy. Routine monitoring helps track your baseline levels and adjust treatment as needed. Work with your care team to establish a testing schedule that fits your individual needs.
Yes, avoid medications that affect blood clotting or increase bleeding risk. These include aspirin, ibuprofen, naproxen, and other NSAIDs. Also avoid anticoagulants like warfarin unless specifically prescribed for another condition. Always tell doctors, dentists, and pharmacists about your fibrinogen deficiency before starting any new medication. They can recommend safer alternatives when needed.
There is currently no cure for fibrinogen deficiency because it's caused by genetic mutations. However, the condition can be managed effectively with fibrinogen replacement therapy and careful medical monitoring. Gene therapy research is ongoing but not yet available as a treatment option. Most people with proper care can prevent serious complications and maintain good quality of life.