LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY
Blood sampling. Paramedic at a general practice (GP) clinic taking blood samples from a patient's arm. The samples of blood will be labelled and sent for testing. Blood is analysed for levels of components such as cholesterol and glucose, for pathogens like bacteria and viruses, and to determine a person's blood group. Photographed in Edinburgh, Scotland.
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