SATURN STILLS / SCIENCE PHOTO LIBRARY SATURN STILLS / SCIENCE PHOTO LIBRARY
Blood sampling. Doctor's gloved hands use a syringe with a tube and stop needle (butterfly needle) to extract a blood sample from the arm of a patient. The stop needle has a protruding green collar to stop it when the needle has been pushed a prescribed distance into the vein. A red tourniquet around the upper arm stops blood flow. Blood samples are subjected to many tests in modern hospitals, helping to confirm a medical diagnosis or identify a disorder.
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