ALEX BARTEL / SCIENCE PHOTO LIBRARY ALEX BARTEL / SCIENCE PHOTO LIBRARY
Blood sampling. Doctor removing a blood sample from a child's arm. The doctor is using a vacutainer, a device which automatically sucks up blood from the vein once it is punctured. Blood may be tested for many reasons, including checking for bacteria and viruses, measuring blood sugar levels (important for diabetics) and determining blood group, which is essential for transfusions.
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