ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Blood sampling. Blood sample dripping into a vial having been removed from a person's arm by the gravity method. In this technique, the vessel is punctured, and the blood flows down into the vial under the force of gravity. Blood samples are subjected to a battery of hospital tests in order to confirm diagnoses or identify disorders. The gloves on the hands holding the vial help maintain sterile conditions.
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