Clinical Evaluation of Bleeding and Bruising in Primary Care.

Bleeding and bruising are common symptoms in the primary care setting. The patient history can help determine whether the bruising or bleeding is abnormal. The International Society on Thrombosis and Hemostasis has developed a bleeding assessment tool that can be used to indicate possible pathology. A family history of bleeding problems may suggest a hereditary coagulation defect. Such a history is especially important in children who may not have experienced a major bleeding episode. Medication review can identify pharmacologic causes of the bleeding or bruising. Physical examination findings such as mucocutaneous bleeding suggest that the underlying condition is caused by platelet dysfunction, whereas hemarthroses or hematomas are more common in coagulopathy. If the history and physical examination findings suggest a bleeding diathesis, initial laboratory testing includes a complete blood count, peripheral blood smear, prothrombin time (PT), and partial thromboplastin time (PTT). A normal PT and PTT indicate a platelet disorder, the most common of which is von Willebrand disease. A normal PT and prolonged PTT signal a deficit in the intrinsic pathway, and a mixing study should be performed. A vitamin K challenge is indicated in patients with an abnormal PT and normal PTT. A workup for liver failure is warranted in patients with prolonged PT and PTT. If initial testing does not reveal an etiology in a patient with a high suspicion for a bleeding disorder, the patient should be referred to a hematologist for additional evaluation.