ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Taking blood. Syringe filling with blood from a patient's arm vein. The blood sample will be used to test for the presence of infection in the blood or to test for the blood group of donor blood. The upper arm of the patient has a tourniquet (upper right) that was tightened around the arm to make the veins stand out and aid the insertion of the needle.
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