Primary familial and congenital polycythemia (PFCP)
What is Primary familial and congenital polycythemia (PFCP)?
Primary familial and congenital polycythemia is a rare genetic condition that causes your body to make too many red blood cells. This happens because of mutations in genes that control how your body senses oxygen or responds to signals to make red blood cells. Unlike other types of polycythemia that develop later in life, PFCP is present from birth or early childhood.
Your red blood cells carry oxygen throughout your body. When you have too many, your blood becomes thicker and moves more slowly through your vessels. This can increase your risk of blood clots, strokes, and heart problems. The condition runs in families and follows predictable inheritance patterns.
PFCP is different from acquired polycythemia, which develops from lung disease, smoking, or other environmental factors. People with PFCP typically have normal oxygen levels and normal spleen size. Early detection through blood testing helps prevent serious complications and guides treatment decisions.
Symptoms
- Headaches that come and go throughout the day
- Dizziness or feeling lightheaded when standing
- Reddish or purplish skin color, especially on the face
- Itching after bathing or showering in warm water
- Blurred vision or seeing spots
- Fatigue despite getting enough sleep
- Shortness of breath during normal activities
- Tingling or numbness in hands and feet
- Fullness or discomfort in the upper left belly
- Unexpected bruising or bleeding from small cuts
Many people with PFCP have no symptoms in early childhood. The condition is often discovered through routine blood work. Symptoms typically appear gradually as red blood cell counts continue to rise over time.
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Causes and risk factors
PFCP is caused by mutations in genes that control red blood cell production. The most common mutations affect the erythropoietin receptor gene or genes involved in how your cells sense oxygen levels. These genetic changes cause your bone marrow to make too many red blood cells even when your body has enough oxygen. The condition is inherited from parents and can follow different patterns depending on which gene is affected.
Risk factors include having a parent or sibling with the condition, belonging to certain ethnic populations where specific mutations are more common, and having a family history of early strokes or blood clots. Unlike acquired polycythemia, lifestyle factors like smoking do not cause PFCP. The mutations are present from birth, though symptoms may not appear until later in childhood or adulthood.
How it's diagnosed
Doctors diagnose PFCP through blood tests that measure your red blood cell count and other markers. An elevated RBC count is the first sign that prompts further investigation. Your doctor will also check your hemoglobin and hematocrit levels, which are typically high in people with this condition. Additional tests help rule out other causes of high red blood cell counts, such as lung disease or kidney problems.
Rite Aid offers blood testing that includes red blood cell count measurement as part of our core panel. This can help detect elevated RBC levels early. If PFCP is suspected, your doctor may order genetic testing to identify specific mutations. A family history of similar blood abnormalities supports the diagnosis and helps distinguish PFCP from other forms of polycythemia.
Treatment options
- Phlebotomy, a procedure that removes blood to reduce red blood cell counts and prevent clots
- Low-dose aspirin to reduce the risk of blood clots and stroke
- Staying well hydrated by drinking at least 8 glasses of water daily
- Avoiding activities that decrease oxygen levels, such as smoking or spending time at high altitudes
- Regular monitoring of blood counts to track changes and adjust treatment
- Managing other cardiovascular risk factors like high blood pressure and cholesterol
- Avoiding iron supplements unless specifically prescribed by your doctor
- Working with a hematologist who specializes in blood disorders
Concerned about Primary familial and congenital polycythemia (PFCP)? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
PFCP is caused by inherited genetic mutations and is present from birth, while acquired polycythemia develops later from lung disease, smoking, or other environmental factors. People with PFCP have normal oxygen levels and typically normal spleen size. The familial pattern and early onset help doctors distinguish PFCP from other forms.
There is no cure for PFCP because it is caused by permanent genetic mutations. However, the condition can be effectively managed with regular phlebotomy and monitoring. Most people with PFCP live normal lives with proper treatment. Early detection and consistent care help prevent serious complications like blood clots and strokes.
Most people with PFCP need blood tests every 3 to 6 months to monitor red blood cell counts. Your doctor may recommend more frequent testing if your counts are unstable or if treatment is being adjusted. Regular monitoring helps ensure your red blood cell levels stay in a safe range and prevents complications.
The inheritance pattern depends on which gene mutation causes your PFCP. Some forms are dominant, meaning each child has a 50% chance of inheriting the condition. Other forms are recessive and require mutations from both parents. Genetic counseling can help you understand your specific risk and make informed family planning decisions.
Phlebotomy is similar to donating blood. A healthcare provider inserts a needle into a vein in your arm and removes about one pint of blood. The procedure takes 15 to 30 minutes and may cause mild fatigue afterward. Most people need phlebotomy every few weeks or months, depending on how quickly their red blood cell counts rise.
Lifestyle changes alone cannot cure PFCP, but they support medical treatment. Staying well hydrated helps keep blood from becoming too thick. Avoiding smoking and high altitudes prevents additional strain on your oxygen system. Regular exercise and a heart-healthy diet support overall cardiovascular health and reduce complication risks.
No, PFCP is not cancer. It is a benign genetic condition that causes overproduction of normal red blood cells. Unlike polycythemia vera, which is a blood cancer, PFCP does not increase your risk of developing leukemia or other blood cancers. The condition requires lifelong management but is not malignant.
Itching after warm baths or showers is a common symptom of polycythemia. It happens because increased red blood cells trigger the release of histamine, a chemical that causes itching. The warmth dilates blood vessels and makes the sensation more noticeable. Antihistamines and cooler water temperatures may help reduce discomfort.
Yes, untreated PFCP significantly increases your risk of blood clots, which can cause strokes, heart attacks, and deep vein thrombosis. Thick blood strains your heart and blood vessels over time. Some people develop enlarged spleens or liver problems. Regular treatment with phlebotomy and monitoring dramatically reduces these risks and improves long-term outcomes.
Symptoms can appear at any age, from infancy through adulthood. Some people are diagnosed as babies through routine blood work, while others are not diagnosed until their 20s or 30s. The age of onset depends on which genetic mutation you have and how high your red blood cell counts become. Family screening can help identify PFCP early.