Definition

Thrombocytopenia is any disorder in which there are not enough platelets. Platelets are cells in the blood that help blood to clot. This condition is sometimes associated with abnormal bleeding.

Causes, incidence, and risk factors

Thrombocytopenia is often divided into three major causes of low platelets:

1. Low production of platelets in the bone marrow
2. Increased breakdown of platelets in the bloodstream (called intravascular)
3. Increased breakdown of platelets in the spleen or liver (called extravascular)

Disorders that involve low production in the bone marrow include:

• Aplastic anemia
• Cancer in the bone marrow
• Infections in the bone marrow (rare)
• Drugs (very rare)

Disorders that involve the breakdown of platelets include:

• Immune thrombocytopenic purpura (ITP)
• Drug-induced immune thrombocytopenia
• Drug-induced nonimmune thrombocytopenia
• Thrombotic thrombocytopenic purpura
• Disseminated intravascular coagulation (DIC)
• Hypersplenism

Symptoms

• Bruising
• Nosebleeds or bleeding in the mouth
• Rash (pinpoint red spots)

Other symptoms may be present as well, depending on the cause of the condition. Mild thrombocytopenia can occur without symptoms.

Signs and tests

• CBC shows low platelets
• Bone marrow aspiration or biopsy may be normal or may show low megakaryocytes (platelet precursors) or an infiltrating disease.
• PTT clotting study is normal
• PT clotting study is normal
• Platelet associated antibodies may be present

Treatment

Treatment depends on the cause of the condition. In some cases, a transfusion of platelets may be required to stop or prevent bleeding.

Support Groups

Expectations (prognosis)

The outcome depends on the disorder causing the low platelet counts.

Complications

• Hemorrhage
• Gastrointestinal bleeding (vomiting blood or blood in the stools)
• Bleeding in the brain (intracranial hemorrhage)

Calling your health care provider

Call your healthcare provider if you experience unexplained bleeding or bruising.

Prevention

Prevention depends on the specific cause.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org). URAC's accreditation program is an independent audit to verify that A.D.A.M. follows rigorous standards of quality and accountability. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial policy, editorial process, and privacy policy. A.D.A.M. is also a founding member of Hi-Ethics and subscribes to the principles of the Health on the Net Foundation (www.hon.ch.)

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. ©1997-2008 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.