JIM VARNEY / SCIENCE PHOTO LIBRARY JIM VARNEY / SCIENCE PHOTO LIBRARY
Blood clotting test. Nurse performing an international normalized ratio (INR) test on blood from the finger of a patient. This test is used to check the clotting tendency (coagulation) of blood. It is commonly used on patient's taking warfarin, an anti-clotting drug, to ensure the correct dosage.
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