AJ PHOTO / HOP AMERICAIN / SCIENCE PHOTO LIBRARY AJ PHOTO / HOP AMERICAIN / SCIENCE PHOTO LIBRARY
Taking blood. Nurse taking a blood sample from a patient. The green tourniquet around the patient's left arm restricts blood flow, causing the veins to stand up for easier access. The blood is drawn, under partial vacuum, through a needle (under the swab) into a sample tube (vacutainer).
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