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Disorders that affect the cells in the blood (blood cells) or proteins in the blood clotting or immune systems are called blood disorders or hematologic disorders. Laboratory tests to detect blood disorders generally begin with examination of the blood, which is easily obtained from a vein with a needle and syringe or sometimes from the fingertip by a needle prick. However, evaluation may require examination of the bone marrow, because that is where blood cells develop.
Last full review/revision May 2006 by Steven H. Kroft, MD
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