SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Blood sampling. A doctor takes a blood sample from a man's arm with a syringe and test tube. The grey strap around the patient's upper arm is a tourniquet. This restricts blood flow out of the arm, making veins stand up so that they are easier to puncture. Blood samples are subjected to a battery of tests in modern hospitals, helping to confirm diagnoses or identify disorders.
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