JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Blood sample. Gloved hand holds a hypodermic syringe filled with a blood sample. A drop of blood is seen at the needle tip. The needle was pushed into a vein, usually in the arm, to extract the blood. Blood samples are subjected to many tests in modern hospitals, helping to confirm a medical diagnosis or identify a disorder.
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