MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Taking blood. Nurse taking a blood sample from a patient. The tourniquet around the patient's left arm restricts blood flow, causing the veins to stand up for easy access. The blood is drawn under partial vacuum, through a needle (upper centre) and into a sample tube (far right). The nurse is wearing a protective coat and gloves.
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