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Basophil (Close-up) Formed elements of blood

Overview Risks Results

Blood differential

Alternative Names: Differential; White blood cell differential count What the risks are: Excessive bleeding Fainting or feeling light-headed Hematoma (blood accumulating under the skin) Infection (a slight risk any time the skin is broken) Multiple punctures to locate veins Special considerations: Veins and arteries vary in size from one patient to another, and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

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