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Petechiae


Diagnosis & Tests

How is the disease diagnosed?

Diagnosis of petechiae begins with the history and physical exam. Blood tests are usually done, including:

  • bleeding time, or the amount of time it takes for the blood to clot
  • tests that measure clotting abilities, such as a prothrombin time or partial thromboplastin time
  • complete blood count, or CBC
  • platelet count
  • Platelets are blood cells that aid in blood clotting. If a person has too few of them in the blood, the person may be more likely develop petechiae. A bone marrow biopsy may be done in some cases.


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