DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Blood samples. Vacutainer tubes with colour-coded caps containing blood samples for analysis in a haematology laboratory. The vacutainers are designed to draw venous blood into a vacuum inside the tube. The colour-coding indicates the use of the tubes, with this purple colour indicating general haematology testing. Blood is analysed for levels of components such as cholesterol and glucose, for pathogens such as bacteria and viruses, and to determine a person's blood group.
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