JOHN COLE / SCIENCE PHOTO LIBRARY JOHN COLE / SCIENCE PHOTO LIBRARY
Blood sampling. Doctor using a syringe to take a blood sample from the radial artery of a patient's wrist. The doctor is using her fingers to locate the artery. The blood sample will be subjected to many different tests to confirm a diagnosis or to identify a disease. Sampling from an artery is less common than from a vein, but may be used to check the oxygen content of the blood. Photographed at St Richard's Hospital, Chichester, England.
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