DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Gloved hands of a nurse use a device to prick the skin of the finger in a patient to obtain blood to test for clotting. An international normalized ratio (INR) test will check the clotting tendency (coagulation) of blood in a patient taking the anti-clotting drug warfarin.
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