A laboratory technician verifies a patient's identification and prepares a needle and vials to draw blood in the 51st Medical Support Squadron laboratory at Osan Air Base, Republic of Korea, Oct. 21, 2015. Blood draws can be used for numerous reasons including HIV, drug, and pregnancy tests, checking cholesterol levels, determining if someone is sick, or if they have a bacterial infection, and even if someone recently had a heart attack. (U.S. Air Force photo/Tech. Sgt. Travis Edwards)

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