Essential Thrombocythemia
What is Essential Thrombocythemia?
Essential thrombocythemia is a rare blood disorder where your bone marrow makes too many platelets. Platelets are tiny cells that help your blood clot when you get a cut. When you have too many platelets, your blood becomes thicker and more likely to form clots inside your blood vessels.
This condition is a type of myeloproliferative neoplasm, meaning certain blood cells grow out of control. Most people with essential thrombocythemia have platelet counts above 450,000 per microliter of blood. Normal platelet counts range from 150,000 to 400,000. The condition develops slowly and some people live with it for years without knowing.
About 50% to 60% of people with essential thrombocythemia have a genetic change called the JAK2 V617F mutation. This mutation makes cells keep growing when they should stop. The condition usually affects people over age 50, but it can happen at any age. Women are slightly more likely to develop it than men.
Symptoms
- Headaches that come and go
- Dizziness or lightheadedness
- Vision changes or blind spots
- Burning or tingling in hands and feet
- Redness and warmth in hands or feet
- Unusual bleeding from gums or nose
- Easy bruising on skin
- Weakness or fatigue
- Chest pain or discomfort
- Blood clots in legs or lungs
Many people with essential thrombocythemia have no symptoms at all, especially early on. The condition is often discovered during routine blood work for something else. Some people only learn they have it when they develop a blood clot or unusual bleeding.
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Causes and risk factors
Essential thrombocythemia happens when genetic mutations cause bone marrow cells to make too many platelets. The most common mutation affects the JAK2 gene, found in 50% to 60% of patients. This mutation makes cells divide and grow without the normal stop signals. Other mutations can affect genes called CALR or MPL. Some people with essential thrombocythemia have no detectable mutation at all.
The condition is not inherited from your parents in most cases. The genetic changes happen during your lifetime. Risk factors include being over age 60, though younger people can develop it too. There are no known lifestyle factors that cause essential thrombocythemia. It is not caused by diet, stress, or environmental exposures. The exact trigger for these genetic changes remains unknown.
How it's diagnosed
Essential thrombocythemia is diagnosed through blood tests that measure your platelet count and look for genetic mutations. A platelet count above 450,000 per microliter that stays high over time is the main diagnostic sign. Your doctor will order a complete blood count to check all your blood cell levels. Testing for the JAK2 V617F mutation helps confirm the diagnosis in about half of all cases.
Rite Aid offers blood testing that includes platelet count measurement and JAK2 mutation analysis through our nationwide Quest Diagnostics lab network. Additional tests may check basophil levels, which are elevated in 10% to 20% of patients. Your doctor may also order a bone marrow biopsy to examine the cells directly. Testing helps rule out other causes of high platelet counts like iron deficiency or inflammation.
Treatment options
- Low-dose aspirin to reduce blood clot risk
- Hydroxyurea medication to lower platelet counts
- Anagrelide medication as an alternative platelet reducer
- Interferon therapy for younger patients or during pregnancy
- Plateletpheresis to quickly remove excess platelets in emergencies
- Regular blood count monitoring every few months
- Staying well hydrated to keep blood flowing smoothly
- Avoiding tobacco, which increases clot risk
- Managing other cardiovascular risk factors like high blood pressure
- Discussing any planned surgeries with your care team in advance
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- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Many people have no symptoms when first diagnosed. When symptoms do occur, headaches and dizziness are most common. Some people experience burning or tingling in their hands and feet. Others are only diagnosed after developing a blood clot or unusual bleeding episode.
Essential thrombocythemia is caused by your bone marrow making too many platelets, not a problem with how platelets function. Other clotting disorders may involve normal platelet counts with abnormal clotting proteins. This condition is a type of blood cancer called a myeloproliferative neoplasm, though it grows very slowly.
There is no cure for essential thrombocythemia, but it can be managed effectively with treatment. Most people with this condition live normal lifespans with proper monitoring and medication. The goal of treatment is preventing blood clots and controlling symptoms. Regular blood tests help your doctor adjust your treatment plan as needed.
A platelet count persistently above 450,000 per microliter is the main diagnostic criterion. Normal platelet counts range from 150,000 to 400,000. Your doctor will want to see elevated counts on multiple tests over time, not just one high reading. Other conditions can temporarily raise platelet counts, so persistent elevation is key.
The JAK2 V617F mutation is a genetic change found in 50% to 60% of people with essential thrombocythemia. It causes cells to keep dividing and making platelets without normal stop signals. Finding this mutation in your blood test helps confirm the diagnosis. People without this mutation may have other genetic changes like CALR or MPL mutations.
Most people need blood counts checked every 3 to 6 months once their condition is stable. You may need more frequent testing when starting new medications or if your counts change. Regular monitoring helps your doctor catch problems early and adjust treatment. Annual genetic testing is not usually needed once the initial diagnosis is made.
Blood clots are the most serious complication of untreated essential thrombocythemia. Clots can form in arteries or veins, potentially causing stroke, heart attack, or pulmonary embolism. Paradoxically, some people also experience unusual bleeding because too many platelets can interfere with normal clotting. Treatment significantly reduces these risks.
Staying well hydrated helps keep your blood flowing smoothly and may reduce clot risk. Avoiding tobacco is critical because smoking significantly increases your risk of blood clots. Managing other cardiovascular risk factors like high blood pressure and cholesterol also helps. However, diet and lifestyle alone cannot control platelet counts, medication is usually needed.
Essential thrombocythemia is not usually inherited from your parents. The genetic mutations that cause it develop during your lifetime in your bone marrow cells. Rarely, families have multiple members with myeloproliferative disorders, suggesting some inherited susceptibility. Most cases occur sporadically with no family history.
A small percentage of people with essential thrombocythemia may develop acute myeloid leukemia over many years. This happens in fewer than 5% of patients. The risk is slightly higher in people treated with certain older medications. Regular monitoring helps detect any concerning blood count changes early so your doctor can adjust your care plan.