LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY
Blood sampling. Vacutainer being used at a general practice (GP) clinic to take a blood sample from a patient's arm. The sample 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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