CLAIRE PAXTON & JACQUI FARROW / SCIENCE PHOTO LIBRARY CLAIRE PAXTON & JACQUI FARROW / SCIENCE PHOTO LIBRARY
Blood sample. Blood dripping from the needle of a syringe containing a venous blood sample. Blood samples are taken to check on blood composition and quality. Most blood tests require venous blood, which is usually obtained from a vein at the bend of the elbow using a tourniquet and syringe.
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