Thrombocytopenia
Thrombocytopenia is a condition where your blood has too few platelets, the tiny cells that help stop bleeding by forming clots. When platelet levels drop too low, you may bleed longer than usual from small cuts, bruise more easily, or even experience serious internal bleeding. Understanding this condition can help you manage it safely and maintain a good quality of life.
Table of contents
- What is thrombocytopenia?
- Symptoms
- What causes thrombocytopenia?
- Understanding platelet levels and severity
- How is thrombocytopenia diagnosed?
- Treatment options
- Living with thrombocytopenia
- When to see a doctor
What is thrombocytopenia?
Thrombocytopenia is a condition that develops when the platelet count in your blood becomes too low. Platelets, also called thrombocytes, are colorless blood cells that play a crucial role in stopping bleeding. When you get injured, platelets stick together to form a plug, called a blood clot, that seals your wound and prevents excessive bleeding.[1][2]
In healthy adults, a normal platelet count ranges from 150,000 to 450,000 platelets per microliter of blood. Thrombocytopenia is diagnosed when your platelet count falls below 150,000 per microliter.[2][4]
This condition can affect both children and adults. Some people have thrombocytopenia and don’t realize it because their symptoms are so mild. Many times, it is discovered during a routine blood test.[2][10]
Thrombocytopenia can happen for different reasons. Your bone marrow might not be making enough platelets, your body might be destroying them too quickly, or they might be getting trapped in your spleen (an organ that filters your blood). Sometimes certain medicines or health conditions trigger the problem.[1][3]
Symptoms
Many people with mild thrombocytopenia have no symptoms at all. When symptoms do appear, they are mainly related to bleeding.[2][13]
Common symptoms of thrombocytopenia include:[1][3]
- Easy or excessive bruising on the skin or inside the mouth
- Petechiae – pinpoint-sized red, purple, or brownish dots on the skin, especially on the lower legs, that may look like a rash
- Purpura – larger red, purple, or brown spots on your skin caused by bleeding under the surface
- Bleeding from minor cuts that lasts longer than usual
- Bleeding from the gums or nosebleeds that are hard to stop
- Blood in urine or stools
- Unusually heavy menstrual periods
- Blood in vomit
You may not have serious bleeding until your platelet count becomes very low. However, when platelet levels drop significantly, there is a risk of dangerous internal bleeding, including bleeding in the brain, which can be life-threatening.[2][10]
What causes thrombocytopenia?
Thrombocytopenia can result from several different problems in your body. These causes generally fall into three main categories:[4][5]
Not enough platelets are made in the bone marrow
Your bone marrow may not produce enough platelets if you have:[4][6]
- Aplastic anemia – a disorder where the bone marrow doesn’t make enough blood cells
- Cancer in the bone marrow, such as leukemia or lymphoma
- Cirrhosis (liver scarring)
- Infections in the bone marrow
- Myelodysplastic syndrome – a condition where the bone marrow makes defective blood cells
- Folate or vitamin B12 deficiency
- Chemotherapy treatment for cancer
- Heavy alcohol use
Increased destruction or removal of platelets
Sometimes your body destroys or removes platelets from your bloodstream too quickly. This can happen because of:[4][6]
- Immune thrombocytopenia (ITP) – an autoimmune condition where your immune system mistakenly attacks and destroys platelets
- Drug-induced thrombocytopenia – certain medications can trigger platelet destruction, including heparin, quinine, sulfonamides, acetaminophen, ibuprofen, and some antibiotics
- Heparin-induced thrombocytopenia (HIT) – a serious reaction to the blood-thinner heparin that can cause both low platelets and dangerous blood clots
- Thrombotic thrombocytopenic purpura (TTP) – a disorder that causes blood clots to form in small blood vessels
- Disseminated intravascular coagulation (DIC) – a condition where proteins that control blood clotting become overactive
- Infections such as HIV, hepatitis C, Epstein-Barr virus, sepsis, malaria, or other viral and bacterial infections
- Autoimmune disorders like systemic lupus erythematosus or rheumatoid arthritis
Increased trapping of platelets in the spleen
An enlarged spleen can trap too many platelets, reducing the number available in your bloodstream. This can occur with chronic liver disease or other conditions that affect the spleen.[4][6]
Pregnancy-related causes
About 5% of pregnant women develop mild thrombocytopenia just before giving birth, called gestational thrombocytopenia. More serious cases can occur with preeclampsia and HELLP syndrome (hemolysis, elevated liver enzymes, and low platelet count).[3][10]
Understanding platelet levels and severity
Doctors classify thrombocytopenia based on how low your platelet count is:[5][10]
- Mild thrombocytopenia: Platelet count between 100,000 and 150,000 per microliter. People with this level are generally asymptomatic and have no increased bleeding risk.
- Moderate thrombocytopenia: Platelet count between 50,000 and 99,000 per microliter. There is typically no increased risk of bleeding, though some people may develop mild skin symptoms like petechiae or bruising.
- Severe thrombocytopenia: Platelet count below 50,000 per microliter. There is an increased risk of bleeding. When counts drop below 10,000 per microliter, there is a high risk of serious, life-threatening bleeding.
The relationship between platelet count and bleeding risk isn’t always predictable. Some people with moderately low counts may experience bleeding, while others with very low counts may not.[5]
How is thrombocytopenia diagnosed?
Your healthcare provider will use several methods to diagnose thrombocytopenia:[4][9]
Medical history and physical exam: Your doctor will ask about your symptoms, medications you take, your medical history, and examine you for signs of bleeding under your skin, in your gums, or mouth. They will check the size of your spleen, liver, and lymph nodes.
Blood tests: A complete blood count (CBC) measures the number of blood cells, including platelets, in a sample of your blood. This is the main test used to diagnose thrombocytopenia. Your doctor may compare recent test results with past tests to see if the problem is new or ongoing.[4]
Blood smear: A specialist examines a sample of your blood under a microscope to look at your platelets and check for clumping or irregular shapes, and to examine other blood cells.[4]
Excluding pseudothrombocytopenia: In stable patients being evaluated as outpatients, doctors first need to rule out pseudothrombocytopenia – a false low platelet count that can happen when platelets clump together during blood collection. This is done by collecting blood in a different type of tube and repeating the platelet count.[5]
Blood clotting tests: Tests like partial thromboplastin time (PTT) and prothrombin time (PT) check how well your blood clots.[4]
Bone marrow tests: In some cases, your doctor may recommend a bone marrow aspiration or biopsy. This involves taking a small sample of bone marrow to examine under a microscope. This test helps determine if your bone marrow is making enough platelets.[4][9]
Additional tests may be needed depending on what your doctor suspects is causing your low platelet count.
Treatment options
Treatment for thrombocytopenia depends on the underlying cause, how low your platelet count is, and whether you have symptoms. People with mild thrombocytopenia may not need any treatment.[1][9]
Treating the underlying cause
When possible, doctors focus on treating the condition causing your low platelet count:[9]
- Stopping a medication that is causing the problem
- Treating infections
- Managing underlying diseases like liver disease or cancer
Medications
Several types of medicines can help increase platelet counts:[9][15]
Corticosteroids (such as prednisone or dexamethasone) are the most common first treatment for immune thrombocytopenia. They work by suppressing your immune system and reducing platelet destruction. These medicines can also improve blood vessel integrity to reduce bleeding.[5][15]
Intravenous immune globulin (IVIG) infusion can rapidly increase platelet counts. This treatment uses antibodies to stop your immune system from destroying platelets.[5][15]
Thrombopoietin receptor agonists are medicines that help your bone marrow make more platelets. These are often used as second-line treatment for chronic ITP or when corticosteroids don’t work.[5][15]
Immunomodulators like rituximab may be used for persistent or chronic cases.[5]
Platelet transfusion
Platelet transfusions use donor platelets to boost the number of platelets in your bloodstream. This treatment is recommended when:[5][9]
- You have active bleeding or hemorrhage
- Your platelet count is less than 10,000 per microliter
- You need to have surgery or an invasive procedure (most major procedures require a platelet count of 40,000 to 50,000 per microliter)
Surgery
In some cases, surgical removal of the spleen (splenectomy) may be recommended, particularly for immune thrombocytopenia that doesn’t respond to other treatments. The spleen is where many platelets are destroyed, so removing it can help increase platelet counts.[9][11]
Emergency treatment
Some causes of thrombocytopenia require immediate hospitalization and emergency treatment, including heparin-induced thrombocytopenia, thrombotic microangiopathies, and HELLP syndrome in pregnancy. Treatment for heparin-induced thrombocytopenia involves immediately stopping all heparin and starting a different type of blood thinner to prevent dangerous blood clots.[5]
Living with thrombocytopenia
Living with thrombocytopenia means taking steps to protect yourself from bleeding and managing the physical and emotional challenges of the condition.[16][18]
Preventing injury and bleeding
If your platelet count is below 50,000 per microliter, you should follow activity restrictions to avoid injury:[5][16]
- Avoid contact sports and activities with high risk of injury
- Use caution with sharp objects like knives and razors
- Use a soft toothbrush and avoid flossing too vigorously
- Avoid medications that can interfere with platelet function, such as aspirin, ibuprofen, and other nonsteroidal anti-inflammatory drugs, unless approved by your doctor
- Consider gentler exercises like swimming, stationary cycling, or yoga
Being prepared for bleeding
Keep supplies on hand to treat nosebleeds or other minor bleeding episodes. This might include medications prescribed by your doctor (such as aminocaproic acid or tranexamic acid), nosebleed treatment kits with saline spray and a nose clamp, and adhesive bandages.[16][18]
Managing fatigue
Many people with thrombocytopenia, especially immune thrombocytopenia, experience fatigue. This tiredness can be caused by the condition itself, low iron levels from bleeding, or side effects of treatments.[18][20]
- Eat a balanced diet with lean protein, whole grains, fruits, and vegetables
- Drink plenty of water
- Get at least seven hours of sleep each night
- Exercise regularly within your safety limits
- Manage stress through meditation, yoga, or other relaxation techniques
Monitoring your condition
Learn to recognize the signs that your platelet count may be dropping, such as new petechiae, unusual bruising, or heavier menstrual bleeding. Regular blood tests as recommended by your doctor will help track your platelet levels.[18][19]
Staying safe
Wear medical alert jewelry that identifies your condition. This helps healthcare providers give you appropriate care in an emergency. Keep a list of your medications and medical history with you.[18]
When to see a doctor
Make an appointment with your healthcare provider if you develop symptoms of thrombocytopenia, such as unusual bruising, petechiae, prolonged bleeding from minor cuts, or other signs of bleeding.[1][3]
Seek immediate medical care by calling emergency services if you have:[2]
- Bleeding that won’t stop when you apply pressure
- Severe headache
- Any signs of bleeding in your brain, such as confusion, vision changes, or difficulty speaking
- Severe abdominal pain
- Blood in vomit or stool
Thrombocytopenia can be life-threatening, especially if serious bleeding occurs. Early treatment can help you avoid dangerous complications.[2]
