DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Healthcare worker's gloved hand uses a skin-prick device to obtain blood from a patient's finger for an International normalized ratio (INR) test. The drop of blood is then applied to the testing strip on the INR testing device. The INR test for blood clotting measures the level of prothrombin in a patient's blood and is used to monitor anti-coagulation treatments. A normal INR is around 2.
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