FAYE NORMAN / SCIENCE PHOTO LIBRARY FAYE NORMAN / SCIENCE PHOTO LIBRARY
Blood sampling. Gloved hands of a doctor taking blood from the arm of a woman. The doctor uses a syringe to suck up the blood once the vein has been pierced. The upper arm has a tourniquet (black) tied around it which traps blood in the arm, enlarging the vein and making it easier to pierce. Blood samples are subjected to many tests in modern hospitals, helping to confirm a medical diagnosis or identify a disorder.
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