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Most hematomas can be evaluated and safely treated without laboratory or radiology tests. Often the care provider will be able to take a history and perform a physical examination and decide that no further evaluation is required.
However, depending upon the injury or presentation, blood tests may be ordered, including a hemogram to assess the red blood cell count (often the hemoglobin and hematocrit are measured) and clotting studies, including an INR (international normalized ratio), and PTT (partial thromboplastin time, a blood test that measures how long it takes for blood to clot). The INR is routinely measured in individuals taking the blood thinning medication warfarin, to help monitor the individual's medication dosing.
Depending upon the site of injury or other associated factors, the care provider may request other testing be done. CT scans are useful in looking for blood in the brain or abdomen. Ultrasound is often used for pregnant patients who present with vaginal bleeding.
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