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Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand. A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. Preparation may vary depending on the specific test.
Source Information:
"Blood Test: MedlinePlus Medical Encyclopedia Image." National Library of Medicine - National Institutes of Health. Web. 07 June 2010. http://www.nlm.nih.gov/medlineplus/ency/imagepages/10026.htm.
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